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Fix for vnf_slice(): issue #904

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Revar Desmera 2022-09-17 21:46:23 -07:00
parent c3a6c79dc8
commit e818d781bc
1 changed files with 23 additions and 13 deletions
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36
vnf.scad
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@ -760,9 +760,9 @@ function _vnf_sort_vertices(vnf, idx=[2,1,0]) =
// Usage: // Usage:
// sliced = vnf_slice(vnf, dir, cuts); // sliced = vnf_slice(vnf, dir, cuts);
// Description: // Description:
// Slice the faces of a VNF along a specified axis direction at a given list // Slice the faces of a VNF along a specified axis direction at a given list of cut points.
// of cut points. The cut points can appear in any order. You can use this to refine the faces of a VNF before applying // The cut points can appear in any order. You can use this to refine the faces of a VNF before
// a nonlinear transformation to its vertex set. // applying a nonlinear transformation to its vertex set.
// Arguments: // Arguments:
// vnf = vnf to slice // vnf = vnf to slice
// dir = normal direction to the slices, either "X", "Y" or "Z" // dir = normal direction to the slices, either "X", "Y" or "Z"
@ -774,12 +774,23 @@ function _vnf_sort_vertices(vnf, idx=[2,1,0]) =
// sliced = vnf_slice(vnf, "X", [-6,-1,10]); // sliced = vnf_slice(vnf, "X", [-6,-1,10]);
// color("red")vnf_wireframe(sliced,width=.3); // color("red")vnf_wireframe(sliced,width=.3);
function vnf_slice(vnf,dir,cuts) = function vnf_slice(vnf,dir,cuts) =
let( let(
vert = vnf[0], cuts = [for (cut=cuts) _shift_cut_plane(vnf,dir,cut)],
faces = [for(face=vnf[1]) select(vert,face)], vert = vnf[0],
poly_list = _slice_3dpolygons(faces, dir, cuts) faces = [for(face=vnf[1]) select(vert,face)],
) poly_list = _slice_3dpolygons(faces, dir, cuts)
vnf_merge_points(vnf_from_polygons(poly_list)); )
vnf_merge_points(vnf_from_polygons(poly_list));
function _shift_cut_plane(vnf,dir,cut,off=0.001) =
let(
I = ident(3),
dir_ind = ord(dir)-ord("X"),
verts = vnf[0],
on_cut = [for (x = verts * I[dir_ind]) if(approx(x,cut,eps=1e-4)) 1] != []
) !on_cut? cut :
_shift_cut_plane(vnf,dir,cut+off);
function _split_polygon_at_x(poly, x) = function _split_polygon_at_x(poly, x) =
@ -839,10 +850,9 @@ function _slice_3dpolygons(polys, dir, cuts) =
I = ident(3), I = ident(3),
dir_ind = ord(dir)-ord("X") dir_ind = ord(dir)-ord("X")
) )
flatten([for (poly = polys) flatten([
let( for (poly = polys)
plane = plane_from_polygon(poly) let( plane = plane_from_polygon(poly))
)
assert(plane,"Found non-coplanar face.") assert(plane,"Found non-coplanar face.")
let( let(
normal = point3d(plane), normal = point3d(plane),