diff --git a/examples/chrome_dino.scad b/examples/chrome_dino.scad
index 66e55679..0930c6ec 100644
--- a/examples/chrome_dino.scad
+++ b/examples/chrome_dino.scad
@@ -1,5 +1,5 @@
-use <pixel/px_circle.scad>;
-use <pixel/px_polygon.scad>;
+use <voxel/vx_circle.scad>;
+use <voxel/vx_polygon.scad>;
 
 w = 5;
 merged_dino = false;
@@ -136,7 +136,7 @@ module cactus(w) {
         translate([2 * w, w * 7]) 
         scale(w) 
             blocks(
-                px_polygon([
+                vx_polygon([
                     [0, 2],
                     [3, 2],
                     [5, 4],
@@ -152,7 +152,7 @@ module cactus(w) {
         translate([-2 * w, w * 5]) 
         scale(w)
             blocks(
-                px_polygon([
+                vx_polygon([
                     [-1, 0],
                     [-3, 0],
                     [-6, 2],
@@ -167,7 +167,7 @@ module cactus(w) {
         
         scale(w) 
             blocks(
-                px_polygon([
+                vx_polygon([
                     [-2, 0],
                     [2, 0],
                     [2, 20],
@@ -187,11 +187,11 @@ module base(w, base_x_blocks, base_y_blocks) {
 
         translate([0, base_y_blocks * w / 2]) 
         scale(w) 
-        blocks(px_circle(base_y_blocks / 2, filled = true));
+        blocks(vx_circle(base_y_blocks / 2, filled = true));
 
         translate([base_x_blocks * w, base_y_blocks * w / 2]) 
         scale(w) 
-            blocks(px_circle(base_y_blocks / 2, filled = true));
+            blocks(vx_circle(base_y_blocks / 2, filled = true));
    }   
 }
 
diff --git a/examples/dot_photo_sphere.scad b/examples/dot_photo_sphere.scad
index 5066e8e7..e7b29390 100644
--- a/examples/dot_photo_sphere.scad
+++ b/examples/dot_photo_sphere.scad
@@ -1,4 +1,4 @@
-use <pixel/px_gray.scad>;
+use <voxel/vx_gray.scad>;
 use <ptf/ptf_sphere.scad>;
 
 photo_size = [100, 100];
@@ -106,7 +106,7 @@ levels = [
     [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255] 
 ];
 
-dots = px_gray(levels, center = true, normalize = true);
+dots = vx_gray(levels, center = true, normalize = true);
 
 color("white")
     for(dot = dots) {   
diff --git a/examples/stereographic_caterpillar.scad b/examples/stereographic_caterpillar.scad
index 785ca8b7..1941507c 100644
--- a/examples/stereographic_caterpillar.scad
+++ b/examples/stereographic_caterpillar.scad
@@ -1,4 +1,4 @@
-use <pixel/px_gray.scad>;
+use <voxel/vx_gray.scad>;
 use <stereographic_extrude.scad>;
 
 px_width = 0.8;
@@ -107,7 +107,7 @@ levels = [
 ];
 
 module shadow(levels, px_width) {
-    dots = px_gray(levels, center = true, normalize = true);
+    dots = vx_gray(levels, center = true, normalize = true);
     difference() {
         square(len(levels), center = true);
         render() union() {
diff --git a/examples/taiwan/TaiwaneseBlackBear.scad b/examples/taiwan/TaiwaneseBlackBear.scad
index 84aba230..2a8476a6 100644
--- a/examples/taiwan/TaiwaneseBlackBear.scad
+++ b/examples/taiwan/TaiwaneseBlackBear.scad
@@ -1,8 +1,8 @@
 use <shape_taiwan.scad>;
-use <pixel/px_polyline.scad>;
-use <pixel/px_sphere.scad>;
-use <pixel/px_cylinder.scad>;
-use <pixel/px_polygon.scad>;
+use <voxel/vx_polyline.scad>;
+use <voxel/vx_sphere.scad>;
+use <voxel/vx_cylinder.scad>;
+use <voxel/vx_polygon.scad>;
 
 module blocks(points) {
     for(pt = points) {
@@ -14,32 +14,32 @@ module blocks(points) {
 // Well, quick and dirty!!
 color("MediumSeaGreen") 
     translate([3, -5, -27]) 
-        for(pt = px_polygon([for(p = shape_taiwan(92, distance = 1)) [round(p[0]), round(p[1])]], filled = true)) {
+        for(pt = vx_polygon([for(p = shape_taiwan(92, distance = 1)) [round(p[0]), round(p[1])]], filled = true)) {
             translate(pt) 
                 linear_extrude(1, scale = 0.5) 
                     square(1, center = true);
         }
 
 color(c = [0.3, 0.3, 0.3]) {
-    blocks(px_sphere(10));
-    translate([7, 0, 9]) blocks(px_sphere(3));
-    translate([-7, 0, 9]) blocks(px_sphere(3));
-    translate([0, 0, -13]) blocks(px_sphere(12));
-    translate([6, 0, -26]) blocks(px_cylinder([3, 4], 6));
-    translate([-6, 0, -26]) blocks(px_cylinder([3, 4], 6))
+    blocks(vx_sphere(10));
+    translate([7, 0, 9]) blocks(vx_sphere(3));
+    translate([-7, 0, 9]) blocks(vx_sphere(3));
+    translate([0, 0, -13]) blocks(vx_sphere(12));
+    translate([6, 0, -26]) blocks(vx_cylinder([3, 4], 6));
+    translate([-6, 0, -26]) blocks(vx_cylinder([3, 4], 6))
     translate([10, 0, -13]) cube([6, 5, 10], center = true);
     translate([-10, 0, -13]) cube([6, 5, 10], center = true);
 }
 color("white") {
-    translate([3, -7, 2]) blocks(px_sphere(2));
-    translate([-3, -7, 2]) blocks(px_sphere(2));
-    translate([0, -7, 0]) blocks(px_sphere(3));
-    translate([0, -9, -4]) blocks(px_sphere(1));
-    blocks(px_polyline([[0, -12, -10], [5, -9, -7], [8, -6, -6]]));
-    blocks(px_polyline([[0, -12, -10], [5, -9, -8], [8, -6, -7]]));
-    blocks(px_polyline([[0, -12, -10], [5, -9, -9], [8, -6, -8]]));
-    blocks(px_polyline([[0, -12, -10], [5, -9, -9], [8, -6, -8]]));
-    blocks(px_polyline([[0, -12, -10], [-5, -9, -7], [-8, -6, -6]]));
-    blocks(px_polyline([[0, -12, -10], [-5, -9, -8], [-8, -6, -7]]));
-    blocks(px_polyline([[0, -12, -10], [-5, -9, -9], [-8, -6, -8]]));
+    translate([3, -7, 2]) blocks(vx_sphere(2));
+    translate([-3, -7, 2]) blocks(vx_sphere(2));
+    translate([0, -7, 0]) blocks(vx_sphere(3));
+    translate([0, -9, -4]) blocks(vx_sphere(1));
+    blocks(vx_polyline([[0, -12, -10], [5, -9, -7], [8, -6, -6]]));
+    blocks(vx_polyline([[0, -12, -10], [5, -9, -8], [8, -6, -7]]));
+    blocks(vx_polyline([[0, -12, -10], [5, -9, -9], [8, -6, -8]]));
+    blocks(vx_polyline([[0, -12, -10], [5, -9, -9], [8, -6, -8]]));
+    blocks(vx_polyline([[0, -12, -10], [-5, -9, -7], [-8, -6, -6]]));
+    blocks(vx_polyline([[0, -12, -10], [-5, -9, -8], [-8, -6, -7]]));
+    blocks(vx_polyline([[0, -12, -10], [-5, -9, -9], [-8, -6, -8]]));
 }
\ No newline at end of file
diff --git a/examples/taiwan/leopard_cat_taiwan.scad b/examples/taiwan/leopard_cat_taiwan.scad
index 7dcfa46d..eaa70ab1 100644
--- a/examples/taiwan/leopard_cat_taiwan.scad
+++ b/examples/taiwan/leopard_cat_taiwan.scad
@@ -1,4 +1,4 @@
-use <pixel/px_gray.scad>;
+use <voxel/vx_gray.scad>;
 use <shape_taiwan.scad>;
 
 levels = [
@@ -132,7 +132,7 @@ levels = [
 	[196, 188, 193, 191, 185, 194, 191, 190, 196, 191, 194, 195, 162, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
 ];
 
-dots = px_gray(levels, center = true, invert = true, normalize = true);
+dots = vx_gray(levels, center = true, invert = true, normalize = true);
 linear_extrude(1.5) difference() {
     translate([6.5, -10]) 
 	rotate(22.5) 
diff --git a/examples/pixel_vase.scad b/examples/voxel_vase.scad
similarity index 71%
rename from examples/pixel_vase.scad
rename to examples/voxel_vase.scad
index 5131bd71..3d645880 100644
--- a/examples/pixel_vase.scad
+++ b/examples/voxel_vase.scad
@@ -1,6 +1,6 @@
 use <bezier_curve.scad>;
-use <pixel/px_polyline.scad>;
-use <pixel/px_cylinder.scad>;
+use <voxel/vx_polyline.scad>;
+use <voxel/vx_cylinder.scad>;
 
 x1 = 5;
 x2 = 20;
@@ -18,18 +18,18 @@ module pixel_vase(x1, x2, x3, thickness) {
         [p0, p1, p2, p3, p4]
     )) [round(pt[0]), round(pt[1]), round(pt[2])]];
 
-    px_path = px_polyline(rounded_points);
-    leng = len(px_path);
+    vx_path = vx_polyline(rounded_points);
+    leng = len(vx_path);
 
-    for(p = px_cylinder(px_path[0][0], 1, true)) { 
+    for(p = vx_cylinder(vx_path[0][0], 1, true)) { 
         linear_extrude(1)
         translate([p[0], p[1]])
             square(1.1, center = true);
     }
 
     for(i = [0:leng - 1]) {
-        r = px_path[i][0];
-        for(p = px_cylinder(r, 1, thickness = thickness)) { 
+        r = vx_path[i][0];
+        for(p = vx_cylinder(r, 1, thickness = thickness)) { 
             translate([0, 0, i]) 
             linear_extrude(1) 
             translate([p[0], p[1]])
diff --git a/examples/px_spiral_text.scad b/examples/vx_spiral_text.scad
similarity index 95%
rename from examples/px_spiral_text.scad
rename to examples/vx_spiral_text.scad
index 26e80fbf..a9df4318 100644
--- a/examples/px_spiral_text.scad
+++ b/examples/vx_spiral_text.scad
@@ -1,5 +1,5 @@
 use <hull_polyline2d.scad>;
-use <pixel/px_ascii.scad>;
+use <voxel/vx_ascii.scad>;
 
 tx = "3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172";
 
@@ -9,7 +9,7 @@ linear_extrude(2)
         translate(pts[i]) 
         difference() {
             square(7, center = true);
-            render() for(p = px_ascii(tx[i], center = true)) {
+            render() for(p = vx_ascii(tx[i], center = true)) {
                 translate(p) square(.8);
             }
         } 
diff --git a/src/voxel/_impl/_vx_circle_impl.scad b/src/voxel/_impl/_vx_circle_impl.scad
new file mode 100644
index 00000000..ac99ae04
--- /dev/null
+++ b/src/voxel/_impl/_vx_circle_impl.scad
@@ -0,0 +1,54 @@
+function _vx_circle_y(f, y) = f >= 0 ? y - 1 : y;
+function _vx_circle_ddf_y(f, ddf_y) = f >= 0 ? ddf_y + 2 : ddf_y;
+function _vx_circle_f(f, ddf_y) = f >= 0 ? f + ddf_y : f;
+
+function _vx_circle(f, ddf_x, ddf_y, x, y, filled) = 
+    x >= y ? [] : 
+    let(
+        ny = _vx_circle_y(f, y),
+        nddf_y = _vx_circle_ddf_y(f, ddf_y),
+        nx = x + 1,
+        nddf_x = ddf_x + 2,
+        nf = _vx_circle_f(f, ddf_y) + nddf_x
+    )
+    concat(
+        filled ? 
+            concat(
+               [for(xi = -nx; xi <= nx; xi = xi + 1) [xi, -ny]],
+               [for(xi = -ny; xi <= ny; xi = xi + 1) [xi, -nx]],
+               [for(xi = -ny; xi <= ny; xi = xi + 1) [xi, nx]],
+               [for(xi = -nx; xi <= nx; xi = xi + 1) [xi, ny]]              
+            )
+            :
+            [  
+                [-nx, -ny], [nx, -ny],                 
+                [-ny, -nx], [ny, -nx],
+                [-ny, nx], [ny, nx],
+                [-nx, ny], [nx, ny]
+            ],
+        _vx_circle(nf, nddf_x, nddf_y, nx, ny, filled)
+    );
+    
+function _vx_circle_impl(radius, filled) =
+    let(
+        f = 1 - radius,
+        ddf_x = 1,
+        ddf_y = -2 * radius,
+        x = 0,
+        y = radius
+    )
+    concat(
+        filled ? 
+            concat(
+                [[0, radius], [0, -radius]],
+                [for(xi = -radius; xi <= radius; xi = xi + 1) [xi, 0]]
+            )
+            : 
+            [
+                [0, -radius],                
+                [-radius, 0], 
+                [radius, 0],
+                [0, radius]
+            ],
+        _vx_circle(f, ddf_x, ddf_y, x, y, filled)
+    );
\ No newline at end of file
diff --git a/src/voxel/_impl/_vx_cylinder_impl.scad b/src/voxel/_impl/_vx_cylinder_impl.scad
new file mode 100644
index 00000000..de3d2bb9
--- /dev/null
+++ b/src/voxel/_impl/_vx_cylinder_impl.scad
@@ -0,0 +1,49 @@
+function _vx_cylinder_vx_circle(radius, filled, thickness) = 
+    let(range = [-radius: radius - 1])
+    filled ? [
+        for(y = range)        
+           for(x = range)
+               let(v = [x, y])
+               if(norm(v) < radius) v
+    ] :
+    let(ishell = radius * radius - 2 * thickness * radius)
+    [
+        for(y = range)        
+           for(x = range)
+               let(
+                   v = [x, y],
+                   leng = norm(v)
+               )
+               if(leng < radius && (leng * leng) > ishell) v    
+    ];
+
+function _vx_cylinder_diff_r(r, h, filled, thickness) =
+    let(
+        r1 = r[0],
+        r2 = r[1]
+    )
+    r1 == r2 ? _vx_cylinder_same_r(r1, h, filled, thickness) :
+    let(dr = (r2 - r1) / (h - 1))
+    [
+        for(i = 0; i < h; i = i + 1)
+        let(r = round(r1 + dr * i))
+        each [
+            for(pt = _vx_cylinder_vx_circle(r, filled, thickness))
+            [pt[0], pt[1], i]
+        ]
+    ]; 
+
+function _vx_cylinder_same_r(r, h, filled, thickness) =
+    let(c = _vx_cylinder_vx_circle(r, filled, thickness))
+    [
+        for(i = 0; i < h; i = i + 1)
+        each [
+            for(pt = c)
+            [pt[0], pt[1], i]
+        ]
+    ]; 
+
+function _vx_cylinder_impl(r, h, filled, thickness) =
+    is_num(r) ? 
+        _vx_cylinder_same_r(r, h, filled, thickness) :
+        _vx_cylinder_diff_r(r, h, filled, thickness); 
\ No newline at end of file
diff --git a/src/voxel/_impl/_vx_from_impl.scad b/src/voxel/_impl/_vx_from_impl.scad
new file mode 100644
index 00000000..e7adc30b
--- /dev/null
+++ b/src/voxel/_impl/_vx_from_impl.scad
@@ -0,0 +1,21 @@
+function _vx_from_row(r_count, row_bits, width, height, center, invert) =
+    let(
+        half_w = width / 2,
+        half_h = height / 2,
+        offset_x = center ? 0 : half_w,
+        offset_y = center ? -half_h : 0,
+        bit = invert ? 0 : 1
+    ) 
+    [for(i = 0; i < width; i = i + 1) if(row_bits[i] == bit) [i - half_w + offset_x, r_count + offset_y]];
+
+function _vx_from_impl(binaries, center, invert) = 
+    let(
+        width = len(binaries[0]),
+        height = len(binaries),
+        offset_i = height / 2
+    )
+    [
+        for(i = height - 1; i > -1; i = i - 1) 
+        let(row = _vx_from_row(height - i - 1, binaries[i], width, height, center, invert))
+        if(row != []) each row
+    ];
\ No newline at end of file
diff --git a/src/voxel/_impl/_vx_gray_impl.scad b/src/voxel/_impl/_vx_gray_impl.scad
new file mode 100644
index 00000000..fa54e3da
--- /dev/null
+++ b/src/voxel/_impl/_vx_gray_impl.scad
@@ -0,0 +1,29 @@
+function _vx_gray_row(r_count, row_bits, width, height, center, invert, normalize) =
+    let(
+        half_w = width / 2,
+        half_h = height / 2,
+        offset_x = center ? 0 : half_w,
+        offset_y = center ? -half_h : 0,
+        level = invert ? 0 : 255,
+        nmal = normalize ? 255 : 1
+    ) 
+    [
+        for(i = 0; i < width; i = i + 1) 
+            if(row_bits[i] != level) 
+                [
+                    [i - half_w + offset_x, r_count + offset_y], 
+                    invert ? row_bits[i] / nmal : (255 - row_bits[i]) / nmal
+                ]
+    ];
+
+function _vx_gray_impl(levels, center, invert, normalize) = 
+    let(
+        width = len(levels[0]),
+        height = len(levels),
+        offset_i = height / 2
+    )
+    [
+        for(i = height - 1; i > -1; i = i - 1) 
+        let(row = _vx_gray_row(height - i - 1, levels[i], width, height, center, invert, normalize))
+        if(row != []) each row
+    ];
\ No newline at end of file
diff --git a/src/voxel/_impl/_vx_line_impl.scad b/src/voxel/_impl/_vx_line_impl.scad
new file mode 100644
index 00000000..0b6dad7d
--- /dev/null
+++ b/src/voxel/_impl/_vx_line_impl.scad
@@ -0,0 +1,202 @@
+
+use <../../__comm__/__to3d.scad>;
+use <../../__comm__/__to2d.scad>;
+
+function _vx_line_zsgn(a) = a == 0 ? a : a / abs(a);
+    
+// x-dominant
+function _vx_line_xdominant_y(y, yd, sy) = yd >= 0 ? y + sy : y;
+function _vx_line_xdominant_yd(yd, ax, ay) = (yd >= 0 ? yd - ax : yd) + ay;
+function _vx_line_xdominant_z(z, zd, sz) = zd >= 0 ? z + sz : z;
+function _vx_line_xdominant_zd(zd, ax, az) = (zd >= 0 ? zd - ax : zd) + az;
+
+function _vx_line_xdominant(start, end, a, s) = 
+    let(
+        x = start[0],
+        y = start[1],
+        z = start[2],
+        ax = a[0],
+        ay = a[1],
+        az = a[2],
+        sx = s[0],
+        sy = s[1],
+        sz = s[2],        
+        shrx = floor(ax / 2),
+        yd = ay - shrx,
+        zd = az - shrx,
+        endx = end[0]
+    )
+    concat(
+        [start], 
+        _vx_line_xdominant_sub(
+            x + sx, 
+            _vx_line_xdominant_y(y, yd, sy), 
+            _vx_line_xdominant_z(z, zd, sz), 
+            endx, 
+            a, 
+            s, 
+            _vx_line_xdominant_yd(yd, ax, ay), 
+            _vx_line_xdominant_zd(zd, ax, az)
+        )
+    );
+
+function _vx_line_xdominant_sub(x, y, z, endx, a, s, yd, zd) = 
+    let(
+        ax = a[0],
+        ay = a[1],
+        az = a[2],
+        sx = s[0],
+        sy = s[1],
+        sz = s[2]
+    )
+    x == endx ? [] : 
+        concat([[x, y, z]], 
+            _vx_line_xdominant_sub(
+                x + sx, 
+                _vx_line_xdominant_y(y, yd, sy), 
+                _vx_line_xdominant_z(z, zd, sz), 
+                endx, 
+                a, 
+                s, 
+                _vx_line_xdominant_yd(yd, ax, ay), 
+                _vx_line_xdominant_zd(zd, ax, az)
+            )
+        );
+        
+// y-dominant
+function _vx_line_ydominant_x(x, xd, sx) = xd >= 0 ? x + sx : x;
+function _vx_line_ydominant_xd(xd, ax, ay) = (xd >= 0 ? xd - ay : xd) + ax;
+function _vx_line_ydominant_z(z, zd, sz) = zd >= 0 ? z + sz : z;
+function _vx_line_ydominant_zd(zd, ay, az) = (zd >= 0 ? zd - ay : zd) + az;
+        
+function _vx_line_ydominant(start, end, a, s) = 
+    let(
+        x = start[0],
+        y = start[1],
+        z = start[2],
+        ax = a[0],
+        ay = a[1],
+        az = a[2],
+        sx = s[0],
+        sy = s[1],
+        sz = s[2],        
+        shry = floor(ay / 2),
+        xd = ax - shry,
+        zd = az - shry,
+        endy = end[1]
+    )
+    concat(
+        [start], 
+        _vx_line_ydominant_sub(
+            _vx_line_ydominant_x(x, xd, sx), 
+            y + sy,
+            _vx_line_ydominant_z(z, zd, sz), 
+            endy, 
+            a, 
+            s, 
+            _vx_line_ydominant_xd(xd, ax, ay), 
+            _vx_line_ydominant_zd(zd, ay, az)
+        )
+    );
+
+function _vx_line_ydominant_sub(x, y, z, endy, a, s, xd, zd) = 
+    let(
+        ax = a[0],
+        ay = a[1],
+        az = a[2],
+        sx = s[0],
+        sy = s[1],
+        sz = s[2]
+    )
+    y == endy ? [] : 
+        concat([[x, y, z]], 
+            _vx_line_ydominant_sub(
+                _vx_line_ydominant_x(x, xd, sx), 
+                y + sy,
+                _vx_line_ydominant_z(z, zd, sz), 
+                endy, 
+                a, 
+                s, 
+                _vx_line_ydominant_xd(xd, ax, ay), 
+                _vx_line_ydominant_zd(zd, ay, az)
+            )
+        );
+
+// z-dominant
+function _vx_line_zdominant_x(x, xd, sx) = xd >= 0 ? x + sx : x;
+function _vx_line_zdominant_xd(xd, ax, az) = (xd >= 0 ? xd - az : xd) + ax;
+
+function _vx_line_zdominant_y(y, yd, sy) = yd >= 0 ? y + sy : y;
+function _vx_line_zdominant_yd(yd, ay, az) = (yd >= 0 ? yd - az : yd) + ay;
+        
+function _vx_line_zdominant(start, end, a, s) = 
+    let(
+        x = start[0],
+        y = start[1],
+        z = start[2],
+        ax = a[0],
+        ay = a[1],
+        az = a[2],
+        sx = s[0],
+        sy = s[1],
+        sz = s[2],        
+        shrz = floor(az / 2),
+        xd = ax - shrz,
+        yd = ay - shrz,
+        endz = end[2]
+    )
+    concat(
+        [start], 
+        _vx_line_zdominant_sub(
+            _vx_line_zdominant_x(x, xd, sx), 
+            _vx_line_zdominant_y(y, yd, sy), 
+            z + sz,
+            endz, 
+            a, 
+            s, 
+            _vx_line_zdominant_xd(xd, ax, az), 
+            _vx_line_zdominant_yd(yd, ay, az)
+        )
+    );
+
+function _vx_line_zdominant_sub(x, y, z, endz, a, s, xd, yd) = 
+    let(
+        ax = a[0],
+        ay = a[1],
+        az = a[2],
+        sx = s[0],
+        sy = s[1],
+        sz = s[2]
+    )
+    z == endz ? [] : 
+        concat([[x, y, z]], 
+            _vx_line_zdominant_sub(
+                _vx_line_zdominant_x(x, xd, sx), 
+                _vx_line_zdominant_y(y, yd, sy), 
+                z + sz,
+                endz, 
+                a, 
+                s, 
+                _vx_line_zdominant_xd(xd, ax, az), 
+                _vx_line_zdominant_yd(yd, ay, az)
+            )
+        );
+        
+function _vx_line_impl(p1, p2) = 
+    let(
+        is_2d = len(p1) == 2,
+        start_pt = is_2d ? __to3d(p1) : p1,
+        end_pt = is_2d ? __to3d(p2) : p2,
+        dt = end_pt - start_pt,
+        ax = floor(abs(dt[0]) * 2),
+        ay = floor(abs(dt[1]) * 2),
+        az = floor(abs(dt[2]) * 2),
+        sx = _vx_line_zsgn(dt[0]),
+        sy = _vx_line_zsgn(dt[1]),
+        sz = _vx_line_zsgn(dt[2]),
+        points = ax >= max(ay, az) ? _vx_line_xdominant(start_pt, end_pt, [ax, ay, az], [sx, sy, sz]) : (
+            ay >= max(ax, az) ? _vx_line_ydominant(start_pt, end_pt, [ax, ay, az], [sx, sy, sz]) :
+                _vx_line_zdominant(start_pt, end_pt, [ax, ay, az], [sx, sy, sz])
+        )
+    )   
+    is_2d ? [for(pt = points) __to2d(pt)] : points;
\ No newline at end of file
diff --git a/src/voxel/vx_ascii.scad b/src/voxel/vx_ascii.scad
new file mode 100644
index 00000000..b2bd5ba5
--- /dev/null
+++ b/src/voxel/vx_ascii.scad
@@ -0,0 +1,971 @@
+/**
+* vx_ascii.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_ascii.html
+*
+**/ 
+
+use <vx_from.scad>;
+
+function vx_ascii(char, center = false, invert = false) = 
+    let(code = ord(char))
+    assert(code > 31 && code < 127, "not printable character")
+    let(
+        idx = code - 32,
+        binaries = [
+            [// " " 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+		    ],        
+            [// "!"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+		    ],
+            [// "\""
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,0,1,0,0],
+                [0,0,0,1,0,1,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+		    ],
+            [// "#"
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,0,0,1,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,1,0,0,1,0,0],
+                [0,0,1,0,0,1,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,1,0,0,1,0,0],
+                [0,0,0,0,0,0,0,0]
+		    ],
+            [// "$"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,0,1,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,1,0,0,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,0,0,1,0,0,0,0]
+		    ],
+            [// "%"
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,0,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+		    ],
+            [// "&"
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,0,0,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,0,0,1,0,1,0],
+                [0,1,0,0,0,1,0,0],
+                [0,0,1,1,1,0,1,0],
+                [0,0,0,0,0,0,0,0]
+		    ],
+            [// "'"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+		    ],
+            [// "("
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,1,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+		    ],
+            [// ")"
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,1,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,1,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "*"
+                [0,0,0,0,0,0,0,0],
+                [0,1,0,1,0,1,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,1,0,0,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,1,0,1,0,1,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "+"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// ","
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0]
+            ],
+            [// "-"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "."
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "/"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "0"
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,1,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "1"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "2"
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "3"
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "4"
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,1,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "5"
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "6"
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "7"
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "8" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "9"
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// ":" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// ";" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0]
+            ],
+            [// "<" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,0,1,1,0]
+            ],
+            [// "=" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// ">" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,0,0,0,0,0]
+            ],
+            [// "?" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "@" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,1,0,1,0],
+                [0,1,1,0,1,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "A" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "B" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "C" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "D" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,0,0,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "E" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "F" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "G" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "H" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "I" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "J" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,1,0,0,1,1,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0],
+            ],
+            [// "K" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,1,1,0,0,0],
+                [0,1,1,1,1,0,0,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "L" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "M" 
+                [0,0,0,0,0,0,0,0],
+                [1,1,0,0,0,1,1,0],
+                [1,1,1,0,1,1,1,0],
+                [1,1,1,1,1,1,1,0],
+                [1,1,0,1,0,1,1,0],
+                [1,1,0,0,0,1,1,0],
+                [1,1,0,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "N" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,0,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "O" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "P" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "Q" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,0,1,1,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "R" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "S" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "T" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "U" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "V" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "W" 
+                [0,0,0,0,0,0,0,0],
+                [1,1,0,0,0,1,1,0],
+                [1,1,0,0,0,1,1,0],
+                [1,1,0,1,0,1,1,0],
+                [1,1,1,1,1,1,1,0],
+                [1,1,1,0,1,1,1,0],
+                [1,1,0,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "X" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "Y" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "Z" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "/" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "\\" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,0,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "]" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "^" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,0,0,0,0,1,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "_" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [1,1,1,1,1,1,1,1]
+            ],
+            [// "`" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,0,0,0,0],
+                [0,0,0,0,1,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "a" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "b" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "c" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "d" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "e" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "f" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,1,1,1,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "g" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0]
+            ],
+            [// "h" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "i" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "j" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0]
+            ],
+            [// "k" 
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,1,1,0,0,0],
+                [0,1,1,0,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "l" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "m" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,1,1],
+                [0,1,1,1,1,1,1,1],
+                [0,1,1,0,1,0,1,1],
+                [0,1,1,0,0,0,1,1],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "n" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "o" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "p" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0]
+            ],
+            [// "q" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,1,1,0],
+                [0,0,0,0,0,1,1,0]
+            ],
+            [// "r" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "s" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,1,1,0],
+                [0,1,1,0,0,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,0,0,1,1,0],
+                [0,1,1,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "t" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "u" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "v" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "w" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,0,1,1],
+                [0,1,1,0,1,0,1,1],
+                [0,1,1,1,1,1,1,1],
+                [0,0,1,1,1,1,1,0],
+                [0,0,1,1,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "x" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,1,1,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,1,1,0,0],
+                [0,1,1,0,0,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "y" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "z" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,1,1,1,1,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "{" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,1,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,1,1,0,0,0,0],
+                [0,1,1,1,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,0,0,1,1,1,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "|" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "}" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,1,1,1,0],
+                [0,0,0,0,1,1,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,1,1,1,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ],
+            [// "~" 
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,1,1,0,0,0,0],
+                [0,1,0,1,1,0,1,0],
+                [0,0,0,0,1,1,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0],
+                [0,0,0,0,0,0,0,0]
+            ]                   
+        ]
+    )
+    vx_from(binaries[idx], center = center, invert = invert);
\ No newline at end of file
diff --git a/src/voxel/vx_circle.scad b/src/voxel/vx_circle.scad
new file mode 100644
index 00000000..83ff2662
--- /dev/null
+++ b/src/voxel/vx_circle.scad
@@ -0,0 +1,17 @@
+/**
+* vx_circle.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_circle.html
+*
+**/ 
+
+use <_impl/_vx_circle_impl.scad>;
+use <../util/sort.scad>;
+use <../util/dedup.scad>;
+
+function vx_circle(radius, filled = false) = 
+    let(all = _vx_circle_impl(radius, filled))
+    dedup(sort(all, by = "vt"), sorted = true);
\ No newline at end of file
diff --git a/src/voxel/vx_cylinder.scad b/src/voxel/vx_cylinder.scad
new file mode 100644
index 00000000..0c44cdfd
--- /dev/null
+++ b/src/voxel/vx_cylinder.scad
@@ -0,0 +1,17 @@
+/**
+* vx_cylinder.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_cylinder.html
+*
+**/ 
+
+use <_impl/_vx_cylinder_impl.scad>; 
+use <../util/sort.scad>;
+use <../util/dedup.scad>;
+
+function vx_cylinder(r, h, filled = false, thickness = 1) =
+    let(all = _vx_cylinder_impl(r, h, filled, thickness))
+    dedup(sort(all, by = "vt"), sorted = true);
\ No newline at end of file
diff --git a/src/voxel/vx_difference.scad b/src/voxel/vx_difference.scad
new file mode 100644
index 00000000..c2535e8f
--- /dev/null
+++ b/src/voxel/vx_difference.scad
@@ -0,0 +1,6 @@
+use <../util/sort.scad>;
+use <../util/has.scad>;
+
+function vx_difference(points1, points2) =
+    let(sorted = sort(points2, by = "vt"))
+    [for(p = points1) if(!has(sorted, p, sorted = true)) p];
\ No newline at end of file
diff --git a/src/voxel/vx_from.scad b/src/voxel/vx_from.scad
new file mode 100644
index 00000000..8ff72567
--- /dev/null
+++ b/src/voxel/vx_from.scad
@@ -0,0 +1,13 @@
+/**
+* vx_from.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_from.html
+*
+**/ 
+
+use <_impl/_vx_from_impl.scad>;
+
+function vx_from(binaries, center = false, invert = false) = _vx_from_impl(binaries, center, invert);
\ No newline at end of file
diff --git a/src/voxel/vx_gray.scad b/src/voxel/vx_gray.scad
new file mode 100644
index 00000000..dcbed2d2
--- /dev/null
+++ b/src/voxel/vx_gray.scad
@@ -0,0 +1,14 @@
+/**
+* vx_gray.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_gray.html
+*
+**/ 
+
+use <_impl/_vx_gray_impl.scad>;
+
+function vx_gray(levels, center = false, invert = false, normalize = false) = 
+    _vx_gray_impl(levels, center, invert, normalize);
\ No newline at end of file
diff --git a/src/voxel/vx_intersection.scad b/src/voxel/vx_intersection.scad
new file mode 100644
index 00000000..04f99344
--- /dev/null
+++ b/src/voxel/vx_intersection.scad
@@ -0,0 +1,11 @@
+use <../util/sort.scad>;
+use <../util/has.scad>;
+
+function vx_intersection(points1, points2) =
+    let(
+        leng1 = len(points1),
+        leng2 = len(points2),
+        pts_pair = leng1 > leng2 ? [points1, points2] : [points2, points1],
+        sorted = sort(pts_pair[1], by = "vt")
+    )
+    [for(p = pts_pair[0]) if(has(sorted, p, sorted = true)) p];
\ No newline at end of file
diff --git a/src/voxel/vx_line.scad b/src/voxel/vx_line.scad
new file mode 100644
index 00000000..0381ac3b
--- /dev/null
+++ b/src/voxel/vx_line.scad
@@ -0,0 +1,13 @@
+/**
+* vx_line.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_line.html
+*
+**/ 
+
+use <_impl/_vx_line_impl.scad>;
+
+function vx_line(p1, p2) = _vx_line_impl(p1, p2);
\ No newline at end of file
diff --git a/src/voxel/vx_polygon.scad b/src/voxel/vx_polygon.scad
new file mode 100644
index 00000000..8ce50534
--- /dev/null
+++ b/src/voxel/vx_polygon.scad
@@ -0,0 +1,31 @@
+use <../in_shape.scad>;
+use <../util/sort.scad>;
+use <../util/dedup.scad>;
+use <vx_polyline.scad>;
+
+function vx_polygon(points, filled = false) =
+    let(contour = vx_polyline(concat(points, [points[0]])))
+    !filled ? contour :
+    let(
+        sortedXY = sort(contour, by = "vt"),
+        ys = [for(p = sortedXY) p[1]],
+        rows = [
+            for(y = [min(ys):max(ys)])
+            let(
+                idxes = search(y, sortedXY, num_returns_per_match = 0, index_col_num = 1)
+            )
+            [for(i = idxes) sortedXY[i]]
+        ],
+        all = concat(
+            sortedXY,
+            [
+                for(row = rows)
+                let(to = len(row) - 1, y = row[0][1])
+                if(to > 0 && (row[0][0] + 1 != row[to][0]))
+                    for(i = [row[0][0] + 1:row[to][0] - 1])
+                    let(p = [i, y])
+                    if(in_shape(points, p)) p
+            ]
+        )
+    )
+    dedup(sort(all, by = "vt"), sorted = true);
\ No newline at end of file
diff --git a/src/voxel/vx_polyline.scad b/src/voxel/vx_polyline.scad
new file mode 100644
index 00000000..169d1a43
--- /dev/null
+++ b/src/voxel/vx_polyline.scad
@@ -0,0 +1,28 @@
+/**
+* vx_polyline.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_polyline.html
+*
+**/ 
+
+use <../__comm__/__to3d.scad>;
+use <../__comm__/__to2d.scad>;
+use <../__comm__/__lines_from.scad>;
+use <../util/sort.scad>;
+use <../util/dedup.scad>;
+use <vx_line.scad>;
+
+function vx_polyline(points) =
+    let(
+        is_2d = len(points[0]) == 2,
+        pts = is_2d ? [for(pt = points) __to3d(pt)] : points,
+        polyline = [for(line =  __lines_from(pts)) each vx_line(line[0], line[1])]
+    )
+    dedup(is_2d ? 
+        sort([for(pt = polyline) __to2d(pt)], by = "vt")
+         : 
+        sort(polyline, by = "vt")
+    , sorted = true);
\ No newline at end of file
diff --git a/src/voxel/vx_sphere.scad b/src/voxel/vx_sphere.scad
new file mode 100644
index 00000000..970c0880
--- /dev/null
+++ b/src/voxel/vx_sphere.scad
@@ -0,0 +1,31 @@
+/**
+* vx_sphere.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vx_sphere.html
+*
+**/ 
+
+function vx_sphere(radius, filled = false, thickness = 1) = 
+    let(range = [-radius: radius - 1])
+    filled ? [
+        for(z = range)
+            for(y = range)        
+               for(x = range)
+                   let(v = [x, y, z])
+                   if(norm(v) < radius) v
+    ] :
+    let(ishell = radius * radius - 2 * thickness * radius)
+    [
+        for(z = range)
+            for(y = range)        
+               for(x = range)
+                   let(
+                       v = [x, y, z],
+                       leng = norm(v)
+                   )
+                   if(leng < radius && (leng * leng) > ishell) v    
+    ];
+    
\ No newline at end of file
diff --git a/src/voxel/vx_union.scad b/src/voxel/vx_union.scad
new file mode 100644
index 00000000..c3c3d01e
--- /dev/null
+++ b/src/voxel/vx_union.scad
@@ -0,0 +1,8 @@
+use <../util/sort.scad>;
+use <../util/dedup.scad>;
+
+function vx_union(points1, points2) =
+    dedup(
+        sort(concat(points1, points2), by = "vt"), 
+        sorted = true
+    );
\ No newline at end of file
diff --git a/test/test_all.scad b/test/test_all.scad
index 1825467b..1acbefcb 100644
--- a/test/test_all.scad
+++ b/test/test_all.scad
@@ -69,13 +69,13 @@ include <util/test_sort.scad>;
 include <util/test_reverse.scad>;
 include <util/test_fibseq.scad>;
 
-// Pixel
-include <pixel/test_px_line.scad>;
-include <pixel/test_px_polyline.scad>;
-include <pixel/test_px_circle.scad>;
-include <pixel/test_px_cylinder.scad>;
-include <pixel/test_px_sphere.scad>;
-include <pixel/test_px_polygon.scad>;
+// Voxel
+include <voxel/test_vx_line.scad>;
+include <voxel/test_vx_polyline.scad>;
+include <voxel/test_vx_circle.scad>;
+include <voxel/test_vx_cylinder.scad>;
+include <voxel/test_vx_sphere.scad>;
+include <voxel/test_vx_polygon.scad>;
 
 // Matrix
 include <matrix/test_m_cumulate.scad>;
\ No newline at end of file
diff --git a/test/pixel/test_px_circle.scad b/test/voxel/test_vx_circle.scad
similarity index 95%
rename from test/pixel/test_px_circle.scad
rename to test/voxel/test_vx_circle.scad
index 88c1577e..34f25d2b 100644
--- a/test/pixel/test_px_circle.scad
+++ b/test/voxel/test_vx_circle.scad
@@ -1,13 +1,13 @@
 use <unittest.scad>;
-use <pixel/px_circle.scad>;
+use <voxel/vx_circle.scad>;
 
-module test_px_circle() {
-    echo("==== test_px_circle ====");
+module test_vx_circle() {
+    echo("==== test_vx_circle ====");
 
     expected = [[-3, -10], [-2, -10], [-1, -10], [0, -10], [1, -10], [2, -10], [3, -10], [-5, -9], [-4, -9], [-3, -9], [-2, -9], [-1, -9], [0, -9], [1, -9], [2, -9], [3, -9], [4, -9], [5, -9], [-6, -8], [-5, -8], [-4, -8], [-3, -8], [-2, -8], [-1, -8], [0, -8], [1, -8], [2, -8], [3, -8], [4, -8], [5, -8], [6, -8], [-7, -7], [-6, -7], [-5, -7], [-4, -7], [-3, -7], [-2, -7], [-1, -7], [0, -7], [1, -7], [2, -7], [3, -7], [4, -7], [5, -7], [6, -7], [7, -7], [-8, -6], [-7, -6], [-6, -6], [-5, -6], [-4, -6], [-3, -6], [-2, -6], [-1, -6], [0, -6], [1, -6], [2, -6], [3, -6], [4, -6], [5, -6], [6, -6], [7, -6], [8, -6], [-9, -5], [-8, -5], [-7, -5], [-6, -5], [-5, -5], [-4, -5], [-3, -5], [-2, -5], [-1, -5], [0, -5], [1, -5], [2, -5], [3, -5], [4, -5], [5, -5], [6, -5], [7, -5], [8, -5], [9, -5], [-9, -4], [-8, -4], [-7, -4], [-6, -4], [-5, -4], [-4, -4], [-3, -4], [-2, -4], [-1, -4], [0, -4], [1, -4], [2, -4], [3, -4], [4, -4], [5, -4], [6, -4], [7, -4], [8, -4], [9, -4], [-10, -3], [-9, -3], [-8, -3], [-7, -3], [-6, -3], [-5, -3], [-4, -3], [-3, -3], [-2, -3], [-1, -3], [0, -3], [1, -3], [2, -3], [3, -3], [4, -3], [5, -3], [6, -3], [7, -3], [8, -3], [9, -3], [10, -3], [-10, -2], [-9, -2], [-8, -2], [-7, -2], [-6, -2], [-5, -2], [-4, -2], [-3, -2], [-2, -2], [-1, -2], [0, -2], [1, -2], [2, -2], [3, -2], [4, -2], [5, -2], [6, -2], [7, -2], [8, -2], [9, -2], [10, -2], [-10, -1], [-9, -1], [-8, -1], [-7, -1], [-6, -1], [-5, -1], [-4, -1], [-3, -1], [-2, -1], [-1, -1], [0, -1], [1, -1], [2, -1], [3, -1], [4, -1], [5, -1], [6, -1], [7, -1], [8, -1], [9, -1], [10, -1], [-10, 0], [-9, 0], [-8, 0], [-7, 0], [-6, 0], [-5, 0], [-4, 0], [-3, 0], [-2, 0], [-1, 0], [0, 0], [1, 0], [2, 0], [3, 0], [4, 0], [5, 0], [6, 0], [7, 0], [8, 0], [9, 0], [10, 0], [-10, 1], [-9, 1], [-8, 1], [-7, 1], [-6, 1], [-5, 1], [-4, 1], [-3, 1], [-2, 1], [-1, 1], [0, 1], [1, 1], [2, 1], [3, 1], [4, 1], [5, 1], [6, 1], [7, 1], [8, 1], [9, 1], [10, 1], [-10, 2], [-9, 2], [-8, 2], [-7, 2], [-6, 2], [-5, 2], [-4, 2], [-3, 2], [-2, 2], [-1, 2], [0, 2], [1, 2], [2, 2], [3, 2], [4, 2], [5, 2], [6, 2], [7, 2], [8, 2], [9, 2], [10, 2], [-10, 3], [-9, 3], [-8, 3], [-7, 3], [-6, 3], [-5, 3], [-4, 3], [-3, 3], [-2, 3], [-1, 3], [0, 3], [1, 3], [2, 3], [3, 3], [4, 3], [5, 3], [6, 3], [7, 3], [8, 3], [9, 3], [10, 3], [-9, 4], [-8, 4], [-7, 4], [-6, 4], [-5, 4], [-4, 4], [-3, 4], [-2, 4], [-1, 4], [0, 4], [1, 4], [2, 4], [3, 4], [4, 4], [5, 4], [6, 4], [7, 4], [8, 4], [9, 4], [-9, 5], [-8, 5], [-7, 5], [-6, 5], [-5, 5], [-4, 5], [-3, 5], [-2, 5], [-1, 5], [0, 5], [1, 5], [2, 5], [3, 5], [4, 5], [5, 5], [6, 5], [7, 5], [8, 5], [9, 5], [-8, 6], [-7, 6], [-6, 6], [-5, 6], [-4, 6], [-3, 6], [-2, 6], [-1, 6], [0, 6], [1, 6], [2, 6], [3, 6], [4, 6], [5, 6], [6, 6], [7, 6], [8, 6], [-7, 7], [-6, 7], [-5, 7], [-4, 7], [-3, 7], [-2, 7], [-1, 7], [0, 7], [1, 7], [2, 7], [3, 7], [4, 7], [5, 7], [6, 7], [7, 7], [-6, 8], [-5, 8], [-4, 8], [-3, 8], [-2, 8], [-1, 8], [0, 8], [1, 8], [2, 8], [3, 8], [4, 8], [5, 8], [6, 8], [-5, 9], [-4, 9], [-3, 9], [-2, 9], [-1, 9], [0, 9], [1, 9], [2, 9], [3, 9], [4, 9], [5, 9], [-3, 10], [-2, 10], [-1, 10], [0, 10], [1, 10], [2, 10], [3, 10]];
-    actual = px_circle(10, true);
+    actual = vx_circle(10, true);
 
     assertEqualPoints(expected, actual);
 }
 
-test_px_circle();
\ No newline at end of file
+test_vx_circle();
\ No newline at end of file
diff --git a/test/pixel/test_px_cylinder.scad b/test/voxel/test_vx_cylinder.scad
similarity index 98%
rename from test/pixel/test_px_cylinder.scad
rename to test/voxel/test_vx_cylinder.scad
index 1fc514eb..72f1c4ad 100644
--- a/test/pixel/test_px_cylinder.scad
+++ b/test/voxel/test_vx_cylinder.scad
@@ -1,8 +1,8 @@
 use <unittest.scad>;
-use <pixel/px_cylinder.scad>;
+use <voxel/vx_cylinder.scad>;
 
-module test_px_cylinder() {
-    echo("==== test_px_cylinder ====");
+module test_vx_cylinder() {
+    echo("==== test_vx_cylinder ====");
 
     r1 = 10;
     r2 = 5;
@@ -10,13 +10,13 @@ module test_px_cylinder() {
 
     expected = [[-4, -9, 0], [-3, -9, 0], [-2, -9, 0], [-1, -9, 0], [0, -9, 0], [1, -9, 0], [2, -9, 0], [3, -9, 0], [4, -9, 0], [-5, -8, 0], [-4, -8, 0], [-3, -8, 0], [-2, -8, 0], [-1, -8, 0], [0, -8, 0], [1, -8, 0], [2, -8, 0], [3, -8, 0], [4, -8, 0], [5, -8, 0], [-7, -7, 0], [-6, -7, 0], [-5, -7, 0], [-4, -7, 0], [-3, -7, 0], [-2, -7, 0], [-1, -7, 0], [0, -7, 0], [1, -7, 0], [2, -7, 0], [3, -7, 0], [4, -7, 0], [5, -7, 0], [6, -7, 0], [7, -7, 0], [-7, -6, 0], [-6, -6, 0], [-5, -6, 0], [-4, -6, 0], [-3, -6, 0], [-2, -6, 0], [-1, -6, 0], [0, -6, 0], [1, -6, 0], [2, -6, 0], [3, -6, 0], [4, -6, 0], [5, -6, 0], [6, -6, 0], [7, -6, 0], [-8, -5, 0], [-7, -5, 0], [-6, -5, 0], [-5, -5, 0], [-4, -5, 0], [-3, -5, 0], [-2, -5, 0], [-1, -5, 0], [0, -5, 0], [1, -5, 0], [2, -5, 0], [3, -5, 0], [4, -5, 0], [5, -5, 0], [6, -5, 0], [7, -5, 0], [8, -5, 0], [-9, -4, 0], [-8, -4, 0], [-7, -4, 0], [-6, -4, 0], [-5, -4, 0], [-4, -4, 0], [-3, -4, 0], [-2, -4, 0], [-1, -4, 0], [0, -4, 0], [1, -4, 0], [2, -4, 0], [3, -4, 0], [4, -4, 0], [5, -4, 0], [6, -4, 0], [7, -4, 0], [8, -4, 0], [9, -4, 0], [-9, -3, 0], [-8, -3, 0], [-7, -3, 0], [-6, -3, 0], [-5, -3, 0], [-4, -3, 0], [-3, -3, 0], [-2, -3, 0], [-1, -3, 0], [0, -3, 0], [1, -3, 0], [2, -3, 0], [3, -3, 0], [4, -3, 0], [5, -3, 0], [6, -3, 0], [7, -3, 0], [8, -3, 0], [9, -3, 0], [-9, -2, 0], [-8, -2, 0], [-7, -2, 0], [-6, -2, 0], [-5, -2, 0], [-4, -2, 0], [-3, -2, 0], [-2, -2, 0], [-1, -2, 0], [0, -2, 0], [1, -2, 0], [2, -2, 0], [3, -2, 0], [4, -2, 0], [5, -2, 0], [6, -2, 0], [7, -2, 0], [8, -2, 0], [9, -2, 0], [-9, -1, 0], [-8, -1, 0], [-7, -1, 0], [-6, -1, 0], [-5, -1, 0], [-4, -1, 0], [-3, -1, 0], [-2, -1, 0], [-1, -1, 0], [0, -1, 0], [1, -1, 0], [2, -1, 0], [3, -1, 0], [4, -1, 0], [5, -1, 0], [6, -1, 0], [7, -1, 0], [8, -1, 0], [9, -1, 0], [-9, 0, 0], [-8, 0, 0], [-7, 0, 0], [-6, 0, 0], [-5, 0, 0], [-4, 0, 0], [-3, 0, 0], [-2, 0, 0], [-1, 0, 0], [0, 0, 0], [1, 0, 0], [2, 0, 0], [3, 0, 0], [4, 0, 0], [5, 0, 0], [6, 0, 0], [7, 0, 0], [8, 0, 0], [9, 0, 0], [-9, 1, 0], [-8, 1, 0], [-7, 1, 0], [-6, 1, 0], [-5, 1, 0], [-4, 1, 0], [-3, 1, 0], [-2, 1, 0], [-1, 1, 0], [0, 1, 0], [1, 1, 0], [2, 1, 0], [3, 1, 0], [4, 1, 0], [5, 1, 0], [6, 1, 0], [7, 1, 0], [8, 1, 0], [9, 1, 0], [-9, 2, 0], [-8, 2, 0], [-7, 2, 0], [-6, 2, 0], [-5, 2, 0], [-4, 2, 0], [-3, 2, 0], [-2, 2, 0], [-1, 2, 0], [0, 2, 0], [1, 2, 0], [2, 2, 0], [3, 2, 0], [4, 2, 0], [5, 2, 0], [6, 2, 0], [7, 2, 0], [8, 2, 0], [9, 2, 0], [-9, 3, 0], [-8, 3, 0], [-7, 3, 0], [-6, 3, 0], [-5, 3, 0], [-4, 3, 0], [-3, 3, 0], [-2, 3, 0], [-1, 3, 0], [0, 3, 0], [1, 3, 0], [2, 3, 0], [3, 3, 0], [4, 3, 0], [5, 3, 0], [6, 3, 0], [7, 3, 0], [8, 3, 0], [9, 3, 0], [-9, 4, 0], [-8, 4, 0], [-7, 4, 0], [-6, 4, 0], [-5, 4, 0], [-4, 4, 0], [-3, 4, 0], [-2, 4, 0], [-1, 4, 0], [0, 4, 0], [1, 4, 0], [2, 4, 0], [3, 4, 0], [4, 4, 0], [5, 4, 0], [6, 4, 0], [7, 4, 0], [8, 4, 0], [9, 4, 0], [-8, 5, 0], [-7, 5, 0], [-6, 5, 0], [-5, 5, 0], [-4, 5, 0], [-3, 5, 0], [-2, 5, 0], [-1, 5, 0], [0, 5, 0], [1, 5, 0], [2, 5, 0], [3, 5, 0], [4, 5, 0], [5, 5, 0], [6, 5, 0], [7, 5, 0], [8, 5, 0], [-7, 6, 0], [-6, 6, 0], [-5, 6, 0], [-4, 6, 0], [-3, 6, 0], [-2, 6, 0], [-1, 6, 0], [0, 6, 0], [1, 6, 0], [2, 6, 0], [3, 6, 0], [4, 6, 0], [5, 6, 0], [6, 6, 0], [7, 6, 0], [-7, 7, 0], [-6, 7, 0], [-5, 7, 0], [-4, 7, 0], [-3, 7, 0], [-2, 7, 0], [-1, 7, 0], [0, 7, 0], [1, 7, 0], [2, 7, 0], [3, 7, 0], [4, 7, 0], [5, 7, 0], [6, 7, 0], [7, 7, 0], [-5, 8, 0], [-4, 8, 0], [-3, 8, 0], [-2, 8, 0], [-1, 8, 0], [0, 8, 0], [1, 8, 0], [2, 8, 0], [3, 8, 0], [4, 8, 0], [5, 8, 0], [-4, 9, 0], [-3, 9, 0], [-2, 9, 0], [-1, 9, 0], [0, 9, 0], [1, 9, 0], [2, 9, 0], [3, 9, 0], [4, 9, 0], [-3, -7, 1], [-2, -7, 1], [-1, -7, 1], [0, -7, 1], [1, -7, 1], [2, -7, 1], [3, -7, 1], [-5, -6, 1], [-4, -6, 1], [-3, -6, 1], [-2, -6, 1], [-1, -6, 1], [0, -6, 1], [1, -6, 1], [2, -6, 1], [3, -6, 1], [4, -6, 1], [5, -6, 1], [-6, -5, 1], [-5, -5, 1], [-4, -5, 1], [-3, -5, 1], [-2, -5, 1], [-1, -5, 1], [0, -5, 1], [1, -5, 1], [2, -5, 1], [3, -5, 1], [4, -5, 1], [5, -5, 1], [6, -5, 1], [-6, -4, 1], [-5, -4, 1], [-4, -4, 1], [-3, -4, 1], [-2, -4, 1], [-1, -4, 1], [0, -4, 1], [1, -4, 1], [2, -4, 1], [3, -4, 1], [4, -4, 1], [5, -4, 1], [6, -4, 1], [-7, -3, 1], [-6, -3, 1], [-5, -3, 1], [-4, -3, 1], [-3, -3, 1], [-2, -3, 1], [-1, -3, 1], [0, -3, 1], [1, -3, 1], [2, -3, 1], [3, -3, 1], [4, -3, 1], [5, -3, 1], [6, -3, 1], [7, -3, 1], [-7, -2, 1], [-6, -2, 1], [-5, -2, 1], [-4, -2, 1], [-3, -2, 1], [-2, -2, 1], [-1, -2, 1], [0, -2, 1], [1, -2, 1], [2, -2, 1], [3, -2, 1], [4, -2, 1], [5, -2, 1], [6, -2, 1], [7, -2, 1], [-7, -1, 1], [-6, -1, 1], [-5, -1, 1], [-4, -1, 1], [-3, -1, 1], [-2, -1, 1], [-1, -1, 1], [0, -1, 1], [1, -1, 1], [2, -1, 1], [3, -1, 1], [4, -1, 1], [5, -1, 1], [6, -1, 1], [7, -1, 1], [-7, 0, 1], [-6, 0, 1], [-5, 0, 1], [-4, 0, 1], [-3, 0, 1], [-2, 0, 1], [-1, 0, 1], [0, 0, 1], [1, 0, 1], [2, 0, 1], [3, 0, 1], [4, 0, 1], [5, 0, 1], [6, 0, 1], [7, 0, 1], [-7, 1, 1], [-6, 1, 1], [-5, 1, 1], [-4, 1, 1], [-3, 1, 1], [-2, 1, 1], [-1, 1, 1], [0, 1, 1], [1, 1, 1], [2, 1, 1], [3, 1, 1], [4, 1, 1], [5, 1, 1], [6, 1, 1], [7, 1, 1], [-7, 2, 1], [-6, 2, 1], [-5, 2, 1], [-4, 2, 1], [-3, 2, 1], [-2, 2, 1], [-1, 2, 1], [0, 2, 1], [1, 2, 1], [2, 2, 1], [3, 2, 1], [4, 2, 1], [5, 2, 1], [6, 2, 1], [7, 2, 1], [-7, 3, 1], [-6, 3, 1], [-5, 3, 1], [-4, 3, 1], [-3, 3, 1], [-2, 3, 1], [-1, 3, 1], [0, 3, 1], [1, 3, 1], [2, 3, 1], [3, 3, 1], [4, 3, 1], [5, 3, 1], [6, 3, 1], [7, 3, 1], [-6, 4, 1], [-5, 4, 1], [-4, 4, 1], [-3, 4, 1], [-2, 4, 1], [-1, 4, 1], [0, 4, 1], [1, 4, 1], [2, 4, 1], [3, 4, 1], [4, 4, 1], [5, 4, 1], [6, 4, 1], [-6, 5, 1], [-5, 5, 1], [-4, 5, 1], [-3, 5, 1], [-2, 5, 1], [-1, 5, 1], [0, 5, 1], [1, 5, 1], [2, 5, 1], [3, 5, 1], [4, 5, 1], [5, 5, 1], [6, 5, 1], [-5, 6, 1], [-4, 6, 1], [-3, 6, 1], [-2, 6, 1], [-1, 6, 1], [0, 6, 1], [1, 6, 1], [2, 6, 1], [3, 6, 1], [4, 6, 1], [5, 6, 1], [-3, 7, 1], [-2, 7, 1], [-1, 7, 1], [0, 7, 1], [1, 7, 1], [2, 7, 1], [3, 7, 1], [-2, -4, 2], [-1, -4, 2], [0, -4, 2], [1, -4, 2], [2, -4, 2], [-3, -3, 2], [-2, -3, 2], [-1, -3, 2], [0, -3, 2], [1, -3, 2], [2, -3, 2], [3, -3, 2], [-4, -2, 2], [-3, -2, 2], [-2, -2, 2], [-1, -2, 2], [0, -2, 2], [1, -2, 2], [2, -2, 2], [3, -2, 2], [4, -2, 2], [-4, -1, 2], [-3, -1, 2], [-2, -1, 2], [-1, -1, 2], [0, -1, 2], [1, -1, 2], [2, -1, 2], [3, -1, 2], [4, -1, 2], [-4, 0, 2], [-3, 0, 2], [-2, 0, 2], [-1, 0, 2], [0, 0, 2], [1, 0, 2], [2, 0, 2], [3, 0, 2], [4, 0, 2], [-4, 1, 2], [-3, 1, 2], [-2, 1, 2], [-1, 1, 2], [0, 1, 2], [1, 1, 2], [2, 1, 2], [3, 1, 2], [4, 1, 2], [-4, 2, 2], [-3, 2, 2], [-2, 2, 2], [-1, 2, 2], [0, 2, 2], [1, 2, 2], [2, 2, 2], [3, 2, 2], [4, 2, 2], [-3, 3, 2], [-2, 3, 2], [-1, 3, 2], [0, 3, 2], [1, 3, 2], [2, 3, 2], [3, 3, 2], [-2, 4, 2], [-1, 4, 2], [0, 4, 2], [1, 4, 2], [2, 4, 2]];
 
-    actual = px_cylinder([r1, r2], h, true);
+    actual = vx_cylinder([r1, r2], h, true);
     assertEqualPoints(expected, actual);
 
     expected2 = [[-4, -9, 0], [-3, -9, 0], [-2, -9, 0], [-1, -9, 0], [0, -9, 0], [1, -9, 0], [2, -9, 0], [3, -9, 0], [4, -9, 0], [-5, -8, 0], [-4, -8, 0], [-3, -8, 0], [-2, -8, 0], [-1, -8, 0], [0, -8, 0], [1, -8, 0], [2, -8, 0], [3, -8, 0], [4, -8, 0], [5, -8, 0], [-7, -7, 0], [-6, -7, 0], [-5, -7, 0], [-4, -7, 0], [-3, -7, 0], [-2, -7, 0], [-1, -7, 0], [0, -7, 0], [1, -7, 0], [2, -7, 0], [3, -7, 0], [4, -7, 0], [5, -7, 0], [6, -7, 0], [7, -7, 0], [-7, -6, 0], [-6, -6, 0], [-5, -6, 0], [-4, -6, 0], [-3, -6, 0], [-2, -6, 0], [-1, -6, 0], [0, -6, 0], [1, -6, 0], [2, -6, 0], [3, -6, 0], [4, -6, 0], [5, -6, 0], [6, -6, 0], [7, -6, 0], [-8, -5, 0], [-7, -5, 0], [-6, -5, 0], [-5, -5, 0], [-4, -5, 0], [-3, -5, 0], [-2, -5, 0], [-1, -5, 0], [0, -5, 0], [1, -5, 0], [2, -5, 0], [3, -5, 0], [4, -5, 0], [5, -5, 0], [6, -5, 0], [7, -5, 0], [8, -5, 0], [-9, -4, 0], [-8, -4, 0], [-7, -4, 0], [-6, -4, 0], [-5, -4, 0], [-4, -4, 0], [-3, -4, 0], [-2, -4, 0], [-1, -4, 0], [0, -4, 0], [1, -4, 0], [2, -4, 0], [3, -4, 0], [4, -4, 0], [5, -4, 0], [6, -4, 0], [7, -4, 0], [8, -4, 0], [9, -4, 0], [-9, -3, 0], [-8, -3, 0], [-7, -3, 0], [-6, -3, 0], [-5, -3, 0], [-4, -3, 0], [-3, -3, 0], [-2, -3, 0], [-1, -3, 0], [0, -3, 0], [1, -3, 0], [2, -3, 0], [3, -3, 0], [4, -3, 0], [5, -3, 0], [6, -3, 0], [7, -3, 0], [8, -3, 0], [9, -3, 0], [-9, -2, 0], [-8, -2, 0], [-7, -2, 0], [-6, -2, 0], [-5, -2, 0], [-4, -2, 0], [-3, -2, 0], [-2, -2, 0], [-1, -2, 0], [0, -2, 0], [1, -2, 0], [2, -2, 0], [3, -2, 0], [4, -2, 0], [5, -2, 0], [6, -2, 0], [7, -2, 0], [8, -2, 0], [9, -2, 0], [-9, -1, 0], [-8, -1, 0], [-7, -1, 0], [-6, -1, 0], [-5, -1, 0], [-4, -1, 0], [-3, -1, 0], [-2, -1, 0], [-1, -1, 0], [0, -1, 0], [1, -1, 0], [2, -1, 0], [3, -1, 0], [4, -1, 0], [5, -1, 0], [6, -1, 0], [7, -1, 0], [8, -1, 0], [9, -1, 0], [-9, 0, 0], [-8, 0, 0], [-7, 0, 0], [-6, 0, 0], [-5, 0, 0], [-4, 0, 0], [-3, 0, 0], [-2, 0, 0], [-1, 0, 0], [0, 0, 0], [1, 0, 0], [2, 0, 0], [3, 0, 0], [4, 0, 0], [5, 0, 0], [6, 0, 0], [7, 0, 0], [8, 0, 0], [9, 0, 0], [-9, 1, 0], [-8, 1, 0], [-7, 1, 0], [-6, 1, 0], [-5, 1, 0], [-4, 1, 0], [-3, 1, 0], [-2, 1, 0], [-1, 1, 0], [0, 1, 0], [1, 1, 0], [2, 1, 0], [3, 1, 0], [4, 1, 0], [5, 1, 0], [6, 1, 0], [7, 1, 0], [8, 1, 0], [9, 1, 0], [-9, 2, 0], [-8, 2, 0], [-7, 2, 0], [-6, 2, 0], [-5, 2, 0], [-4, 2, 0], [-3, 2, 0], [-2, 2, 0], [-1, 2, 0], [0, 2, 0], [1, 2, 0], [2, 2, 0], [3, 2, 0], [4, 2, 0], [5, 2, 0], [6, 2, 0], [7, 2, 0], [8, 2, 0], [9, 2, 0], [-9, 3, 0], [-8, 3, 0], [-7, 3, 0], [-6, 3, 0], [-5, 3, 0], [-4, 3, 0], [-3, 3, 0], [-2, 3, 0], [-1, 3, 0], [0, 3, 0], [1, 3, 0], [2, 3, 0], [3, 3, 0], [4, 3, 0], [5, 3, 0], [6, 3, 0], [7, 3, 0], [8, 3, 0], [9, 3, 0], [-9, 4, 0], [-8, 4, 0], [-7, 4, 0], [-6, 4, 0], [-5, 4, 0], [-4, 4, 0], [-3, 4, 0], [-2, 4, 0], [-1, 4, 0], [0, 4, 0], [1, 4, 0], [2, 4, 0], [3, 4, 0], [4, 4, 0], [5, 4, 0], [6, 4, 0], [7, 4, 0], [8, 4, 0], [9, 4, 0], [-8, 5, 0], [-7, 5, 0], [-6, 5, 0], [-5, 5, 0], [-4, 5, 0], [-3, 5, 0], [-2, 5, 0], [-1, 5, 0], [0, 5, 0], [1, 5, 0], [2, 5, 0], [3, 5, 0], [4, 5, 0], [5, 5, 0], [6, 5, 0], [7, 5, 0], [8, 5, 0], [-7, 6, 0], [-6, 6, 0], [-5, 6, 0], [-4, 6, 0], [-3, 6, 0], [-2, 6, 0], [-1, 6, 0], [0, 6, 0], [1, 6, 0], [2, 6, 0], [3, 6, 0], [4, 6, 0], [5, 6, 0], [6, 6, 0], [7, 6, 0], [-7, 7, 0], [-6, 7, 0], [-5, 7, 0], [-4, 7, 0], [-3, 7, 0], [-2, 7, 0], [-1, 7, 0], [0, 7, 0], [1, 7, 0], [2, 7, 0], [3, 7, 0], [4, 7, 0], [5, 7, 0], [6, 7, 0], [7, 7, 0], [-5, 8, 0], [-4, 8, 0], [-3, 8, 0], [-2, 8, 0], [-1, 8, 0], [0, 8, 0], [1, 8, 0], [2, 8, 0], [3, 8, 0], [4, 8, 0], [5, 8, 0], [-4, 9, 0], [-3, 9, 0], [-2, 9, 0], [-1, 9, 0], [0, 9, 0], [1, 9, 0], [2, 9, 0], [3, 9, 0], [4, 9, 0], [-4, -9, 1], [-3, -9, 1], [-2, -9, 1], [-1, -9, 1], [0, -9, 1], [1, -9, 1], [2, -9, 1], [3, -9, 1], [4, -9, 1], [-5, -8, 1], [-4, -8, 1], [-3, -8, 1], [-2, -8, 1], [-1, -8, 1], [0, -8, 1], [1, -8, 1], [2, -8, 1], [3, -8, 1], [4, -8, 1], [5, -8, 1], [-7, -7, 1], [-6, -7, 1], [-5, -7, 1], [-4, -7, 1], [-3, -7, 1], [-2, -7, 1], [-1, -7, 1], [0, -7, 1], [1, -7, 1], [2, -7, 1], [3, -7, 1], [4, -7, 1], [5, -7, 1], [6, -7, 1], [7, -7, 1], [-7, -6, 1], [-6, -6, 1], [-5, -6, 1], [-4, -6, 1], [-3, -6, 1], [-2, -6, 1], [-1, -6, 1], [0, -6, 1], [1, -6, 1], [2, -6, 1], [3, -6, 1], [4, -6, 1], [5, -6, 1], [6, -6, 1], [7, -6, 1], [-8, -5, 1], [-7, -5, 1], [-6, -5, 1], [-5, -5, 1], [-4, -5, 1], [-3, -5, 1], [-2, -5, 1], [-1, -5, 1], [0, -5, 1], [1, -5, 1], [2, -5, 1], [3, -5, 1], [4, -5, 1], [5, -5, 1], [6, -5, 1], [7, -5, 1], [8, -5, 1], [-9, -4, 1], [-8, -4, 1], [-7, -4, 1], [-6, -4, 1], [-5, -4, 1], [-4, -4, 1], [-3, -4, 1], [-2, -4, 1], [-1, -4, 1], [0, -4, 1], [1, -4, 1], [2, -4, 1], [3, -4, 1], [4, -4, 1], [5, -4, 1], [6, -4, 1], [7, -4, 1], [8, -4, 1], [9, -4, 1], [-9, -3, 1], [-8, -3, 1], [-7, -3, 1], [-6, -3, 1], [-5, -3, 1], [-4, -3, 1], [-3, -3, 1], [-2, -3, 1], [-1, -3, 1], [0, -3, 1], [1, -3, 1], [2, -3, 1], [3, -3, 1], [4, -3, 1], [5, -3, 1], [6, -3, 1], [7, -3, 1], [8, -3, 1], [9, -3, 1], [-9, -2, 1], [-8, -2, 1], [-7, -2, 1], [-6, -2, 1], [-5, -2, 1], [-4, -2, 1], [-3, -2, 1], [-2, -2, 1], [-1, -2, 1], [0, -2, 1], [1, -2, 1], [2, -2, 1], [3, -2, 1], [4, -2, 1], [5, -2, 1], [6, -2, 1], [7, -2, 1], [8, -2, 1], [9, -2, 1], [-9, -1, 1], [-8, -1, 1], [-7, -1, 1], [-6, -1, 1], [-5, -1, 1], [-4, -1, 1], [-3, -1, 1], [-2, -1, 1], [-1, -1, 1], [0, -1, 1], [1, -1, 1], [2, -1, 1], [3, -1, 1], [4, -1, 1], [5, -1, 1], [6, -1, 1], [7, -1, 1], [8, -1, 1], [9, -1, 1], [-9, 0, 1], [-8, 0, 1], [-7, 0, 1], [-6, 0, 1], [-5, 0, 1], [-4, 0, 1], [-3, 0, 1], [-2, 0, 1], [-1, 0, 1], [0, 0, 1], [1, 0, 1], [2, 0, 1], [3, 0, 1], [4, 0, 1], [5, 0, 1], [6, 0, 1], [7, 0, 1], [8, 0, 1], [9, 0, 1], [-9, 1, 1], [-8, 1, 1], [-7, 1, 1], [-6, 1, 1], [-5, 1, 1], [-4, 1, 1], [-3, 1, 1], [-2, 1, 1], [-1, 1, 1], [0, 1, 1], [1, 1, 1], [2, 1, 1], [3, 1, 1], [4, 1, 1], [5, 1, 1], [6, 1, 1], [7, 1, 1], [8, 1, 1], [9, 1, 1], [-9, 2, 1], [-8, 2, 1], [-7, 2, 1], [-6, 2, 1], [-5, 2, 1], [-4, 2, 1], [-3, 2, 1], [-2, 2, 1], [-1, 2, 1], [0, 2, 1], [1, 2, 1], [2, 2, 1], [3, 2, 1], [4, 2, 1], [5, 2, 1], [6, 2, 1], [7, 2, 1], [8, 2, 1], [9, 2, 1], [-9, 3, 1], [-8, 3, 1], [-7, 3, 1], [-6, 3, 1], [-5, 3, 1], [-4, 3, 1], [-3, 3, 1], [-2, 3, 1], [-1, 3, 1], [0, 3, 1], [1, 3, 1], [2, 3, 1], [3, 3, 1], [4, 3, 1], [5, 3, 1], [6, 3, 1], [7, 3, 1], [8, 3, 1], [9, 3, 1], [-9, 4, 1], [-8, 4, 1], [-7, 4, 1], [-6, 4, 1], [-5, 4, 1], [-4, 4, 1], [-3, 4, 1], [-2, 4, 1], [-1, 4, 1], [0, 4, 1], [1, 4, 1], [2, 4, 1], [3, 4, 1], [4, 4, 1], [5, 4, 1], [6, 4, 1], [7, 4, 1], [8, 4, 1], [9, 4, 1], [-8, 5, 1], [-7, 5, 1], [-6, 5, 1], [-5, 5, 1], [-4, 5, 1], [-3, 5, 1], [-2, 5, 1], [-1, 5, 1], [0, 5, 1], [1, 5, 1], [2, 5, 1], [3, 5, 1], [4, 5, 1], [5, 5, 1], [6, 5, 1], [7, 5, 1], [8, 5, 1], [-7, 6, 1], [-6, 6, 1], [-5, 6, 1], [-4, 6, 1], [-3, 6, 1], [-2, 6, 1], [-1, 6, 1], [0, 6, 1], [1, 6, 1], [2, 6, 1], [3, 6, 1], [4, 6, 1], [5, 6, 1], [6, 6, 1], [7, 6, 1], [-7, 7, 1], [-6, 7, 1], [-5, 7, 1], [-4, 7, 1], [-3, 7, 1], [-2, 7, 1], [-1, 7, 1], [0, 7, 1], [1, 7, 1], [2, 7, 1], [3, 7, 1], [4, 7, 1], [5, 7, 1], [6, 7, 1], [7, 7, 1], [-5, 8, 1], [-4, 8, 1], [-3, 8, 1], [-2, 8, 1], [-1, 8, 1], [0, 8, 1], [1, 8, 1], [2, 8, 1], [3, 8, 1], [4, 8, 1], [5, 8, 1], [-4, 9, 1], [-3, 9, 1], [-2, 9, 1], [-1, 9, 1], [0, 9, 1], [1, 9, 1], [2, 9, 1], [3, 9, 1], [4, 9, 1], [-4, -9, 2], [-3, -9, 2], [-2, -9, 2], [-1, -9, 2], [0, -9, 2], [1, -9, 2], [2, -9, 2], [3, -9, 2], [4, -9, 2], [-5, -8, 2], [-4, -8, 2], [-3, -8, 2], [-2, -8, 2], [-1, -8, 2], [0, -8, 2], [1, -8, 2], [2, -8, 2], [3, -8, 2], [4, -8, 2], [5, -8, 2], [-7, -7, 2], [-6, -7, 2], [-5, -7, 2], [-4, -7, 2], [-3, -7, 2], [-2, -7, 2], [-1, -7, 2], [0, -7, 2], [1, -7, 2], [2, -7, 2], [3, -7, 2], [4, -7, 2], [5, -7, 2], [6, -7, 2], [7, -7, 2], [-7, -6, 2], [-6, -6, 2], [-5, -6, 2], [-4, -6, 2], [-3, -6, 2], [-2, -6, 2], [-1, -6, 2], [0, -6, 2], [1, -6, 2], [2, -6, 2], [3, -6, 2], [4, -6, 2], [5, -6, 2], [6, -6, 2], [7, -6, 2], [-8, -5, 2], [-7, -5, 2], [-6, -5, 2], [-5, -5, 2], [-4, -5, 2], [-3, -5, 2], [-2, -5, 2], [-1, -5, 2], [0, -5, 2], [1, -5, 2], [2, -5, 2], [3, -5, 2], [4, -5, 2], [5, -5, 2], [6, -5, 2], [7, -5, 2], [8, -5, 2], [-9, -4, 2], [-8, -4, 2], [-7, -4, 2], [-6, -4, 2], [-5, -4, 2], [-4, -4, 2], [-3, -4, 2], [-2, -4, 2], [-1, -4, 2], [0, -4, 2], [1, -4, 2], [2, -4, 2], [3, -4, 2], [4, -4, 2], [5, -4, 2], [6, -4, 2], [7, -4, 2], [8, -4, 2], [9, -4, 2], [-9, -3, 2], [-8, -3, 2], [-7, -3, 2], [-6, -3, 2], [-5, -3, 2], [-4, -3, 2], [-3, -3, 2], [-2, -3, 2], [-1, -3, 2], [0, -3, 2], [1, -3, 2], [2, -3, 2], [3, -3, 2], [4, -3, 2], [5, -3, 2], [6, -3, 2], [7, -3, 2], [8, -3, 2], [9, -3, 2], [-9, -2, 2], [-8, -2, 2], [-7, -2, 2], [-6, -2, 2], [-5, -2, 2], [-4, -2, 2], [-3, -2, 2], [-2, -2, 2], [-1, -2, 2], [0, -2, 2], [1, -2, 2], [2, -2, 2], [3, -2, 2], [4, -2, 2], [5, -2, 2], [6, -2, 2], [7, -2, 2], [8, -2, 2], [9, -2, 2], [-9, -1, 2], [-8, -1, 2], [-7, -1, 2], [-6, -1, 2], [-5, -1, 2], [-4, -1, 2], [-3, -1, 2], [-2, -1, 2], [-1, -1, 2], [0, -1, 2], [1, -1, 2], [2, -1, 2], [3, -1, 2], [4, -1, 2], [5, -1, 2], [6, -1, 2], [7, -1, 2], [8, -1, 2], [9, -1, 2], [-9, 0, 2], [-8, 0, 2], [-7, 0, 2], [-6, 0, 2], [-5, 0, 2], [-4, 0, 2], [-3, 0, 2], [-2, 0, 2], [-1, 0, 2], [0, 0, 2], [1, 0, 2], [2, 0, 2], [3, 0, 2], [4, 0, 2], [5, 0, 2], [6, 0, 2], [7, 0, 2], [8, 0, 2], [9, 0, 2], [-9, 1, 2], [-8, 1, 2], [-7, 1, 2], [-6, 1, 2], [-5, 1, 2], [-4, 1, 2], [-3, 1, 2], [-2, 1, 2], [-1, 1, 2], [0, 1, 2], [1, 1, 2], [2, 1, 2], [3, 1, 2], [4, 1, 2], [5, 1, 2], [6, 1, 2], [7, 1, 2], [8, 1, 2], [9, 1, 2], [-9, 2, 2], [-8, 2, 2], [-7, 2, 2], [-6, 2, 2], [-5, 2, 2], [-4, 2, 2], [-3, 2, 2], [-2, 2, 2], [-1, 2, 2], [0, 2, 2], [1, 2, 2], [2, 2, 2], [3, 2, 2], [4, 2, 2], [5, 2, 2], [6, 2, 2], [7, 2, 2], [8, 2, 2], [9, 2, 2], [-9, 3, 2], [-8, 3, 2], [-7, 3, 2], [-6, 3, 2], [-5, 3, 2], [-4, 3, 2], [-3, 3, 2], [-2, 3, 2], [-1, 3, 2], [0, 3, 2], [1, 3, 2], [2, 3, 2], [3, 3, 2], [4, 3, 2], [5, 3, 2], [6, 3, 2], [7, 3, 2], [8, 3, 2], [9, 3, 2], [-9, 4, 2], [-8, 4, 2], [-7, 4, 2], [-6, 4, 2], [-5, 4, 2], [-4, 4, 2], [-3, 4, 2], [-2, 4, 2], [-1, 4, 2], [0, 4, 2], [1, 4, 2], [2, 4, 2], [3, 4, 2], [4, 4, 2], [5, 4, 2], [6, 4, 2], [7, 4, 2], [8, 4, 2], [9, 4, 2], [-8, 5, 2], [-7, 5, 2], [-6, 5, 2], [-5, 5, 2], [-4, 5, 2], [-3, 5, 2], [-2, 5, 2], [-1, 5, 2], [0, 5, 2], [1, 5, 2], [2, 5, 2], [3, 5, 2], [4, 5, 2], [5, 5, 2], [6, 5, 2], [7, 5, 2], [8, 5, 2], [-7, 6, 2], [-6, 6, 2], [-5, 6, 2], [-4, 6, 2], [-3, 6, 2], [-2, 6, 2], [-1, 6, 2], [0, 6, 2], [1, 6, 2], [2, 6, 2], [3, 6, 2], [4, 6, 2], [5, 6, 2], [6, 6, 2], [7, 6, 2], [-7, 7, 2], [-6, 7, 2], [-5, 7, 2], [-4, 7, 2], [-3, 7, 2], [-2, 7, 2], [-1, 7, 2], [0, 7, 2], [1, 7, 2], [2, 7, 2], [3, 7, 2], [4, 7, 2], [5, 7, 2], [6, 7, 2], [7, 7, 2], [-5, 8, 2], [-4, 8, 2], [-3, 8, 2], [-2, 8, 2], [-1, 8, 2], [0, 8, 2], [1, 8, 2], [2, 8, 2], [3, 8, 2], [4, 8, 2], [5, 8, 2], [-4, 9, 2], [-3, 9, 2], [-2, 9, 2], [-1, 9, 2], [0, 9, 2], [1, 9, 2], [2, 9, 2], [3, 9, 2], [4, 9, 2]];
 
-    actual2 = px_cylinder(r1, h, true);
+    actual2 = vx_cylinder(r1, h, true);
     assertEqualPoints(expected2, actual2);
 }
 
-test_px_cylinder();
\ No newline at end of file
+test_vx_cylinder();
\ No newline at end of file
diff --git a/test/pixel/test_px_line.scad b/test/voxel/test_vx_line.scad
similarity index 82%
rename from test/pixel/test_px_line.scad
rename to test/voxel/test_vx_line.scad
index 7f1f47d0..19794f4b 100644
--- a/test/pixel/test_px_line.scad
+++ b/test/voxel/test_vx_line.scad
@@ -1,13 +1,13 @@
 use <unittest.scad>;
-use <pixel/px_line.scad>;
+use <voxel/vx_line.scad>;
 
-module test_px_line() {
-    echo("==== test_px_line ====");
+module test_vx_line() {
+    echo("==== test_vx_line ====");
 
     expected =  [[-10, 0, -10], [-9, 1, -10], [-9, 2, -9], [-8, 3, -9], [-8, 4, -8], [-7, 5, -8], [-6, 6, -8], [-6, 7, -7], [-5, 8, -7], [-5, 9, -6], [-4, 10, -6], [-3, 11, -6], [-3, 12, -5], [-2, 13, -5], [-2, 14, -4], [-1, 15, -4], [0, 16, -4], [0, 17, -3], [1, 18, -3], [1, 19, -2], [2, 20, -2], [3, 21, -2], [3, 22, -1], [4, 23, -1], [4, 24, 0], [5, 25, 0], [6, 26, 0], [6, 27, 1], [7, 28, 1], [7, 29, 2], [8, 30, 2], [9, 31, 2], [9, 32, 3], [10, 33, 3], [10, 34, 4], [11, 35, 4], [12, 36, 4], [12, 37, 5], [13, 38, 5], [13, 39, 6], [14, 40, 6], [15, 41, 6], [15, 42, 7], [16, 43, 7], [16, 44, 8], [17, 45, 8], [18, 46, 8], [18, 47, 9], [19, 48, 9], [19, 49, 10]];
-    actual = px_line([-10, 0, -10], [20, 50, 10]);
+    actual = vx_line([-10, 0, -10], [20, 50, 10]);
 
     assertEqualPoints(expected, actual);
 }
 
-test_px_line();
\ No newline at end of file
+test_vx_line();
\ No newline at end of file
diff --git a/test/pixel/test_px_polygon.scad b/test/voxel/test_vx_polygon.scad
similarity index 89%
rename from test/pixel/test_px_polygon.scad
rename to test/voxel/test_vx_polygon.scad
index 32bac4e8..16f3359f 100644
--- a/test/pixel/test_px_polygon.scad
+++ b/test/voxel/test_vx_polygon.scad
@@ -1,17 +1,17 @@
 use <unittest.scad>;
-use <pixel/px_polygon.scad>;
+use <voxel/vx_polygon.scad>;
 
-module test_px_polygon() { 
-    echo("==== test_px_polygon ====");
+module test_vx_polygon() { 
+    echo("==== test_vx_polygon ====");
 
     expected = [[-5, -10], [-5, -9], [-4, -9], [-6, -8], [-4, -8], [-6, -7], [-3, -7], [-6, -6], [-3, -6], [-7, -5], [-2, -5], [-7, -4], [-2, -4], [-7, -3], [-1, -3], [-8, -2], [-1, -2], [-8, -1], [0, -1], [-8, 0], [0, 0], [-9, 1], [1, 1], [-9, 2], [1, 2], [-9, 3], [2, 3], [-10, 4], [2, 4], [-10, 5], [-9, 5], [3, 5], [-8, 6], [-7, 6], [-6, 6], [3, 6], [-5, 7], [-4, 7], [-3, 7], [4, 7], [-2, 8], [-1, 8], [0, 8], [4, 8], [1, 9], [2, 9], [3, 9], [5, 9], [4, 10], [5, 10]];
-    actual = px_polygon([[5, 10], [-10, 5], [-5, -10]], false); 
+    actual = vx_polygon([[5, 10], [-10, 5], [-5, -10]], false); 
     assertEqualPoints(expected, actual);
 
     expected2 = [[-5, -10], [-5, -9], [-4, -9], [-6, -8], [-5, -8], [-4, -8], [-6, -7], [-5, -7], [-4, -7], [-3, -7], [-6, -6], [-5, -6], [-4, -6], [-3, -6], [-7, -5], [-6, -5], [-5, -5], [-4, -5], [-3, -5], [-2, -5], [-7, -4], [-6, -4], [-5, -4], [-4, -4], [-3, -4], [-2, -4], [-7, -3], [-6, -3], [-5, -3], [-4, -3], [-3, -3], [-2, -3], [-1, -3], [-8, -2], [-7, -2], [-6, -2], [-5, -2], [-4, -2], [-3, -2], [-2, -2], [-1, -2], [-8, -1], [-7, -1], [-6, -1], [-5, -1], [-4, -1], [-3, -1], [-2, -1], [-1, -1], [0, -1], [-8, 0], [-7, 0], [-6, 0], [-5, 0], [-4, 0], [-3, 0], [-2, 0], [-1, 0], [0, 0], [-9, 1], [-8, 1], [-7, 1], [-6, 1], [-5, 1], [-4, 1], [-3, 1], [-2, 1], [-1, 1], [0, 1], [1, 1], [-9, 2], [-8, 2], [-7, 2], [-6, 2], [-5, 2], [-4, 2], [-3, 2], [-2, 2], [-1, 2], [0, 2], [1, 2], [-9, 3], [-8, 3], [-7, 3], [-6, 3], [-5, 3], [-4, 3], [-3, 3], [-2, 3], [-1, 3], [0, 3], [1, 3], [2, 3], [-10, 4], [-9, 4], [-8, 4], [-7, 4], [-6, 4], [-5, 4], [-4, 4], [-3, 4], [-2, 4], [-1, 4], [0, 4], [1, 4], [2, 4], [-10, 5], [-9, 5], [-8, 5], [-7, 5], [-6, 5], [-5, 5], [-4, 5], [-3, 5], [-2, 5], [-1, 5], [0, 5], [1, 5], [2, 5], [3, 5], [-8, 6], [-7, 6], [-6, 6], [-5, 6], [-4, 6], [-3, 6], [-2, 6], [-1, 6], [0, 6], [1, 6], [2, 6], [3, 6], [-5, 7], [-4, 7], [-3, 7], [-2, 7], [-1, 7], [0, 7], [1, 7], [2, 7], [3, 7], [4, 7], [-2, 8], [-1, 8], [0, 8], [1, 8], [2, 8], [3, 8], [4, 8], [1, 9], [2, 9], [3, 9], [4, 9], [5, 9], [4, 10], [5, 10]];
-    actual2 = px_polygon([[5, 10], [-10, 5], [-5, -10]], true); 
+    actual2 = vx_polygon([[5, 10], [-10, 5], [-5, -10]], true); 
     
     assertEqualPoints(expected2, actual2);
 }
 
-test_px_polygon();
\ No newline at end of file
+test_vx_polygon();
\ No newline at end of file
diff --git a/test/pixel/test_px_polyline.scad b/test/voxel/test_vx_polyline.scad
similarity index 90%
rename from test/pixel/test_px_polyline.scad
rename to test/voxel/test_vx_polyline.scad
index af1f1c4f..387b49b4 100644
--- a/test/pixel/test_px_polyline.scad
+++ b/test/voxel/test_vx_polyline.scad
@@ -1,13 +1,13 @@
 use <unittest.scad>;
-use <pixel/px_polyline.scad>;
+use <voxel/vx_polyline.scad>;
 
-module test_px_polyline() {
-    echo("==== test_px_polyline ====");
+module test_vx_polyline() {
+    echo("==== test_vx_polyline ====");
 
     expected = [[3, 8, 5], [4, 9, 5], [5, 10, 5], [-3, 2, 6], [-2, 3, 6], [-1, 4, 6], [0, 5, 6], [1, 6, 6], [2, 7, 6], [-9, -4, 7], [-8, -3, 7], [-7, -2, 7], [-6, -1, 7], [-5, 0, 7], [-4, 1, 7], [-15, -10, 8], [-14, -9, 8], [-13, -8, 8], [-12, -7, 8], [-11, -6, 8], [-10, -5, 8], [-21, -16, 9], [-20, -15, 9], [-19, -14, 9], [-18, -13, 9], [-17, -12, 9], [-16, -11, 9], [-25, -20, 10], [-25, -19, 10], [-24, -19, 10], [-25, -18, 10], [-23, -18, 10], [-25, -17, 10], [-22, -17, 10], [-25, -16, 11], [-25, -15, 11], [-25, -14, 11], [-25, -13, 11], [-25, -12, 11], [-25, -11, 11], [-25, -10, 11], [-25, -9, 12], [-25, -8, 12], [-25, -7, 12], [-25, -6, 12], [-25, -5, 12], [-25, -4, 12], [-25, -3, 12], [-25, -2, 13], [-25, -1, 13], [-25, 0, 13], [-25, 1, 13], [-25, 2, 13], [-25, 3, 13], [-25, 4, 13], [-25, 5, 14], [-25, 6, 14], [-25, 7, 14], [-25, 8, 14], [-25, 9, 14], [-25, 10, 14], [-25, 11, 14], [-25, 12, 15], [-25, 13, 15], [-25, 14, 15], [-25, 15, 15], [-24, 15, 15], [-23, 15, 15], [-22, 16, 15], [-21, 16, 15], [-20, 16, 16], [-19, 16, 16], [-18, 16, 16], [-17, 17, 16], [-16, 17, 16], [-15, 17, 16], [-14, 17, 16], [-13, 17, 16], [-12, 18, 16], [-11, 18, 16], [-10, 18, 17], [-9, 18, 17], [-8, 18, 17], [-7, 19, 17], [-6, 19, 17], [-5, 19, 17], [-4, 19, 17], [-3, 19, 17], [-2, 20, 17], [-1, 20, 17], [0, 20, 18], [1, 20, 18], [2, 20, 18], [3, 21, 18], [4, 21, 18], [5, 21, 18], [6, 21, 18], [7, 21, 18], [8, 22, 18], [9, 22, 18], [10, 22, 19], [11, 22, 19], [12, 22, 19], [13, 23, 19], [14, 23, 19], [15, 23, 19], [16, 23, 19], [17, 23, 19], [18, 24, 19], [19, 24, 19], [20, 24, 20], [21, 24, 20], [22, 24, 20], [23, 25, 20], [24, 25, 20]];
-    actual = px_polyline([[5, 10, 5], [-25, -20, 10], [-25, 15, 15], [25, 25, 20]]);
+    actual = vx_polyline([[5, 10, 5], [-25, -20, 10], [-25, 15, 15], [25, 25, 20]]);
 
     assertEqualPoints(expected, actual);
 }
 
-test_px_polyline();
\ No newline at end of file
+test_vx_polyline();
\ No newline at end of file
diff --git a/test/pixel/test_px_sphere.scad b/test/voxel/test_vx_sphere.scad
similarity index 95%
rename from test/pixel/test_px_sphere.scad
rename to test/voxel/test_vx_sphere.scad
index 1b09472d..0771350d 100644
--- a/test/pixel/test_px_sphere.scad
+++ b/test/voxel/test_vx_sphere.scad
@@ -1,13 +1,13 @@
 use <unittest.scad>;
-use <pixel/px_sphere.scad>;
+use <voxel/vx_sphere.scad>;
 
-module test_px_sphere() {
-    echo("==== test_px_sphere ====");
+module test_vx_sphere() {
+    echo("==== test_vx_sphere ====");
 
     expected = [[-2, -2, -4], [-1, -2, -4], [0, -2, -4], [1, -2, -4], [2, -2, -4], [-2, -1, -4], [-1, -1, -4], [0, -1, -4], [1, -1, -4], [2, -1, -4], [-2, 0, -4], [-1, 0, -4], [0, 0, -4], [1, 0, -4], [2, 0, -4], [-2, 1, -4], [-1, 1, -4], [0, 1, -4], [1, 1, -4], [2, 1, -4], [-2, 2, -4], [-1, 2, -4], [0, 2, -4], [1, 2, -4], [2, 2, -4], [-2, -3, -3], [-1, -3, -3], [0, -3, -3], [1, -3, -3], [2, -3, -3], [-3, -2, -3], [-2, -2, -3], [2, -2, -3], [3, -2, -3], [-3, -1, -3], [3, -1, -3], [-3, 0, -3], [3, 0, -3], [-3, 1, -3], [3, 1, -3], [-3, 2, -3], [-2, 2, -3], [2, 2, -3], [3, 2, -3], [-2, 3, -3], [-1, 3, -3], [0, 3, -3], [1, 3, -3], [2, 3, -3], [-2, -4, -2], [-1, -4, -2], [0, -4, -2], [1, -4, -2], [2, -4, -2], [-3, -3, -2], [-2, -3, -2], [2, -3, -2], [3, -3, -2], [-4, -2, -2], [-3, -2, -2], [3, -2, -2], [4, -2, -2], [-4, -1, -2], [4, -1, -2], [-4, 0, -2], [4, 0, -2], [-4, 1, -2], [4, 1, -2], [-4, 2, -2], [-3, 2, -2], [3, 2, -2], [4, 2, -2], [-3, 3, -2], [-2, 3, -2], [2, 3, -2], [3, 3, -2], [-2, 4, -2], [-1, 4, -2], [0, 4, -2], [1, 4, -2], [2, 4, -2], [-2, -4, -1], [-1, -4, -1], [0, -4, -1], [1, -4, -1], [2, -4, -1], [-3, -3, -1], [3, -3, -1], [-4, -2, -1], [4, -2, -1], [-4, -1, -1], [4, -1, -1], [-4, 0, -1], [4, 0, -1], [-4, 1, -1], [4, 1, -1], [-4, 2, -1], [4, 2, -1], [-3, 3, -1], [3, 3, -1], [-2, 4, -1], [-1, 4, -1], [0, 4, -1], [1, 4, -1], [2, 4, -1], [-2, -4, 0], [-1, -4, 0], [0, -4, 0], [1, -4, 0], [2, -4, 0], [-3, -3, 0], [3, -3, 0], [-4, -2, 0], [4, -2, 0], [-4, -1, 0], [4, -1, 0], [-4, 0, 0], [4, 0, 0], [-4, 1, 0], [4, 1, 0], [-4, 2, 0], [4, 2, 0], [-3, 3, 0], [3, 3, 0], [-2, 4, 0], [-1, 4, 0], [0, 4, 0], [1, 4, 0], [2, 4, 0], [-2, -4, 1], [-1, -4, 1], [0, -4, 1], [1, -4, 1], [2, -4, 1], [-3, -3, 1], [3, -3, 1], [-4, -2, 1], [4, -2, 1], [-4, -1, 1], [4, -1, 1], [-4, 0, 1], [4, 0, 1], [-4, 1, 1], [4, 1, 1], [-4, 2, 1], [4, 2, 1], [-3, 3, 1], [3, 3, 1], [-2, 4, 1], [-1, 4, 1], [0, 4, 1], [1, 4, 1], [2, 4, 1], [-2, -4, 2], [-1, -4, 2], [0, -4, 2], [1, -4, 2], [2, -4, 2], [-3, -3, 2], [-2, -3, 2], [2, -3, 2], [3, -3, 2], [-4, -2, 2], [-3, -2, 2], [3, -2, 2], [4, -2, 2], [-4, -1, 2], [4, -1, 2], [-4, 0, 2], [4, 0, 2], [-4, 1, 2], [4, 1, 2], [-4, 2, 2], [-3, 2, 2], [3, 2, 2], [4, 2, 2], [-3, 3, 2], [-2, 3, 2], [2, 3, 2], [3, 3, 2], [-2, 4, 2], [-1, 4, 2], [0, 4, 2], [1, 4, 2], [2, 4, 2], [-2, -3, 3], [-1, -3, 3], [0, -3, 3], [1, -3, 3], [2, -3, 3], [-3, -2, 3], [-2, -2, 3], [2, -2, 3], [3, -2, 3], [-3, -1, 3], [3, -1, 3], [-3, 0, 3], [3, 0, 3], [-3, 1, 3], [3, 1, 3], [-3, 2, 3], [-2, 2, 3], [2, 2, 3], [3, 2, 3], [-2, 3, 3], [-1, 3, 3], [0, 3, 3], [1, 3, 3], [2, 3, 3], [-2, -2, 4], [-1, -2, 4], [0, -2, 4], [1, -2, 4], [2, -2, 4], [-2, -1, 4], [-1, -1, 4], [0, -1, 4], [1, -1, 4], [2, -1, 4], [-2, 0, 4], [-1, 0, 4], [0, 0, 4], [1, 0, 4], [2, 0, 4], [-2, 1, 4], [-1, 1, 4], [0, 1, 4], [1, 1, 4], [2, 1, 4], [-2, 2, 4], [-1, 2, 4], [0, 2, 4], [1, 2, 4], [2, 2, 4]];   
-    actual = px_sphere(5, false);
+    actual = vx_sphere(5, false);
     
     assertEqualPoints(expected, actual);
 }
 
-test_px_sphere();
\ No newline at end of file
+test_vx_sphere();
\ No newline at end of file