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add direction options

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This commit is contained in:
Justin Lin
2021-06-22 17:24:58 +08:00
parent 26302df1bc
commit 629edc0422
1 changed files with 39 additions and 17 deletions
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56
src/surface/sf_thicken.scad
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@@ -1,7 +1,17 @@
use <sf_solidify.scad>;
use <../util/sum.scad>;
/**
* sf_thicken.scad
*
* @copyright Justin Lin, 2021
* @license https://opensource.org/licenses/lgpl-3.0.html
*
* @see https://openhome.cc/eGossip/OpenSCAD/lib3x-sf_thicken.html
*
**/
module sf_thicken(points, thickness, direction = undef, swap_surface = false) {
use <../util/sum.scad>;
use <sf_solidify.scad>;
module sf_thicken(points, thickness, direction = "BOTH", swap_surface = false) {
function tri_normal(tri) =
let(v = cross(tri[2] - tri[0], tri[1] - tri[0])) v / norm(v);
@@ -26,20 +36,7 @@ module sf_thicken(points, thickness, direction = undef, swap_surface = false) {
)
sum(normals) / len(normals);
if(direction == undef) {
vertex_normals = [
for(y = [0:len(points) - 1])
[
for(x = [0:len(points[0]) - 1])
vertex_normal(points, x, y)
]
];
half_thickness = thickness / 2;
surface_top = points + half_thickness * vertex_normals;
surface_bottom = points - half_thickness * vertex_normals;
sf_solidify(surface_top, surface_bottom);
}
else {
if(is_list(direction)) {
dir_v = direction / norm(direction);
surface_bottom = points + thickness * [
for(y = [0:len(points) - 1])
@@ -55,6 +52,31 @@ module sf_thicken(points, thickness, direction = undef, swap_surface = false) {
sf_solidify(points, surface_bottom);
}
}
else {
vertex_normals = [
for(y = [0:len(points) - 1])
[
for(x = [0:len(points[0]) - 1])
vertex_normal(points, x, y)
]
];
half_thickness = thickness / 2;
if(direction == "BOTH") {
surface_top = points + half_thickness * vertex_normals;
surface_bottom = points - half_thickness * vertex_normals;
sf_solidify(surface_top, surface_bottom);
}
else if(direction == "FORWARD") {
surface_top = points + thickness * vertex_normals;
surface_bottom = points;
sf_solidify(surface_top, surface_bottom);
}
else {
surface_top = points;
surface_bottom = points - thickness * vertex_normals;
sf_solidify(surface_top, surface_bottom);
}
}
}
/*