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add direction param

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This commit is contained in:
Justin Lin
2021-06-20 15:29:01 +08:00
parent 3ba9e6a3ce
commit 81413584ad
1 changed files with 25 additions and 15 deletions
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40
src/surface/sf_thicken.scad
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@@ -1,7 +1,7 @@
use <sf_solidify.scad>;
use <util/sum.scad>;
module sf_thicken(points, thickness, slicing = "SLASH") {
module sf_thicken(points, thickness, direction = undef, slicing = "SLASH") {
function tri_normal(tri) =
let(v = cross(tri[2] - tri[0], tri[1] - tri[0])) v / norm(v);
@@ -26,20 +26,30 @@ module sf_thicken(points, thickness, slicing = "SLASH") {
)
sum(normals) / len(normals);
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, slicing);
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, slicing);
}
else {
dir_v = direction / norm(direction);
sf = points + thickness * [
for(y = [0:len(points) - 1])
[
for(x = [0:len(points[0]) - 1])
dir_v
]
];
sf_solidify(points, sf, slicing);
}
}
/*