add nz_voronoi2s

src/experimental/demo/nz_voronoi2s_demo.scad

@@ -0,0 +1,22 @@
+use <experimental/nz_voronoi2s.scad>;
+
+size = [100, 50];
+dim = 5;
+seed = 5;
+
+points = [
+    for(y = [0:size[1] - 1]) 
+        for(x = [0:size[0] - 1]) 
+            [x, y]
+];
+        
+noises = nz_voronoi2s(size, points, seed, dim);
+
+max_dist = max(noises);
+for(i = [0:len(noises) - 1]) {
+    c = noises[i] / max_dist;
+    color([c, c, c])
+    linear_extrude(c * max_dist)
+    translate(points[i])
+        square(1);
+}

src/experimental/nz_voronoi2s.scad

@@ -0,0 +1,11 @@
+use <util/rand.scad>;
+use <experimental/_impl/_nz_voronoi2_impl.scad>;
+
+function nz_voronoi2s(size, points, seed, dim = 2) =
+    let(
+        sd = 6 + (is_undef(seed) ? floor(rand(0, 256)) : seed % 256),
+        // m*n pixels per grid
+        m = size[0] / dim,
+        n = size[1] / dim
+    )
+    [for(p = points) _nz_voronoi2(p, sd, dim, m, n)];