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https://github.com/BelfrySCAD/BOSL2.git
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add vnf_slice
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Adrian Mariano
parent
0093d10993
commit
b0611c0daf
1 changed files with 1423 additions and 1366 deletions
213
vnf.scad
213
vnf.scad
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@ -683,6 +683,109 @@ function _vnfcut(plane, vertices, vertexmap, inside, faces, vertcount, newfaces=
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// Function: vnf_slice()
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// Usage:
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// sliced = vnf_slice(vnf, dir, cuts);
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// Description:
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// Slice the faces of a VNF along a specified axis direction at a given list
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// of cut points. You can use this to refine the faces of a VNF before applying
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// a nonlinear transformation to its vertex set.
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// Example:
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// include <BOSL2-fork/polyhedra.scad>
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// vnf = regular_polyhedron_info("vnf", "dodecahedron", side=12);
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// vnf_polyhedron(vnf);
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// sliced = vnf_slice(vnf, "X", [-6,-1,10]);
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// color("red")vnf_wireframe(sliced,width=.3);
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function vnf_slice(vnf,dir,cuts) =
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let(
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vert = vnf[0],
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faces = [for(face=vnf[1]) select(vert,face)],
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poly_list = _slice_3dpolygons(faces, dir, cuts)
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)
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vnf_add_faces(faces=poly_list);
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function _split_polygon_at_x(poly, x) =
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let(
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xs = subindex(poly,0)
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) (min(xs) >= x || max(xs) <= x)? [poly] :
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let(
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poly2 = [
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for (p = pair(poly,true)) each [
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p[0],
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if(
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(p[0].x < x && p[1].x > x) ||
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(p[1].x < x && p[0].x > x)
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) let(
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u = (x - p[0].x) / (p[1].x - p[0].x)
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) [
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x, // Important for later exact match tests
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u*(p[1].y-p[0].y)+p[0].y
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]
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]
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],
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out1 = [for (p = poly2) if(p.x <= x) p],
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out2 = [for (p = poly2) if(p.x >= x) p],
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out3 = [
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if (len(out1)>=3) each split_path_at_self_crossings(out1),
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if (len(out2)>=3) each split_path_at_self_crossings(out2),
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],
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out = [for (p=out3) if (len(p) > 2) cleanup_path(p)]
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) out;
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function _split_2dpolygons_at_each_x(polys, xs, _i=0) =
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_i>=len(xs)? polys :
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_split_2dpolygons_at_each_x(
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[
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for (poly = polys)
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each _split_polygon_at_x(poly, xs[_i])
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], xs, _i=_i+1
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);
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/// Function: _slice_3dpolygons()
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/// Usage:
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/// splitpolys = _slice_3dpolygons(polys, dir, cuts);
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/// Topics: Geometry, Polygons, Intersections
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/// Description:
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/// Given a list of 3D polygons, a choice of X, Y, or Z, and a cut list, `cuts`, splits all of the polygons where they cross
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/// X/Y/Z at any value given in cuts.
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/// Arguments:
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/// polys = A list of 3D polygons to split.
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/// dir_ind = slice direction, 0=X, 1=Y, or 2=Z
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/// cuts = A list of scalar values for locating the cuts
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function _slice_3dpolygons(polys, dir, cuts) =
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assert( [for (poly=polys) if (!is_path(poly,3)) 1] == [], "Expects list of 3D paths.")
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assert( is_vector(cuts), "The split list must be a vector.")
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assert( in_list(dir, ["X", "Y", "Z"]))
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let(
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I = ident(3),
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dir_ind = ord(dir)-ord("X")
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)
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flatten([for (poly = polys)
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let(
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plane = plane_from_polygon(poly),
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normal = point3d(plane),
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pnormal = normal - (normal*I[dir_ind])*I[dir_ind]
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)
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approx(pnormal,[0,0,0]) ? [poly] :
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let (
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pind = max_index(v_abs(pnormal)), // project along this direction
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otherind = 3-pind-dir_ind, // keep dir_ind and this direction
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keep = [I[dir_ind], I[otherind]], // dir ind becomes the x dir
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poly2d = poly*transpose(keep), // project to 2d, putting selected direction in the X position
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poly_list = [for(p=_split_2dpolygons_at_each_x([poly2d], cuts))
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let(
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a = p*keep, // unproject, but pind dimension data is missing
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ofs = outer_product((repeat(plane[3], len(a))-a*normal)/plane[pind],I[pind])
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)
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a+ofs] // ofs computes the missing pind dimension data and adds it back in
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)
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poly_list
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]);
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function _triangulate_planar_convex_polygons(polys) =
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polys==[]? [] :
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let(
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@ -783,7 +886,7 @@ function _triangulate_planar_convex_polygons(polys) =
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// vnf = apply(fwd(5)*yrot(30),cube([100,2,5],center=true));
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// bent = vnf_bend(vnf, axis="Z");
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// vnf_polyhedron(bent);
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function vnf_bend(vnf,r,d,axis="Z") =
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function old_vnf_bend(vnf,r,d,axis="Z") =
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let(
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chk_axis = assert(in_list(axis,["X","Y","Z"])),
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vnf = vnf_triangulate(vnf),
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@ -821,86 +924,40 @@ function vnf_bend(vnf,r,d,axis="Z") =
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]
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]
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) vnf_add_faces(faces=bent_faces);
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function _split_polygon_at_x(poly, x) =
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function vnf_bend(vnf,r,d,axis="Z") =
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let(
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xs = subindex(poly,0)
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) (min(xs) >= x || max(xs) <= x)? [poly] :
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let(
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poly2 = [
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for (p = pair(poly,true)) each [
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p[0],
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if(
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(p[0].x < x && p[1].x > x) ||
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(p[1].x < x && p[0].x > x)
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) let(
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u = (x - p[0].x) / (p[1].x - p[0].x)
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) [
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x, // Important for later exact match tests
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u*(p[1].y-p[0].y)+p[0].y
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]
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]
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],
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out1 = [for (p = poly2) if(p.x <= x) p],
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out2 = [for (p = poly2) if(p.x >= x) p],
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out3 = [
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if (len(out1)>=3) each split_path_at_self_crossings(out1),
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if (len(out2)>=3) each split_path_at_self_crossings(out2),
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],
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out = [for (p=out3) if (len(p) > 2) cleanup_path(p)]
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) out;
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function _split_2dpolygons_at_each_x(polys, xs, _i=0) =
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_i>=len(xs)? polys :
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_split_2dpolygons_at_each_x(
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[
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for (poly = polys)
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each _split_polygon_at_x(poly, xs[_i])
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], xs, _i=_i+1
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);
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/// Function: _slice_3dpolygons()
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/// Usage:
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/// splitpolys = _slice_3dpolygons(polys, dir, cuts);
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/// Topics: Geometry, Polygons, Intersections
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/// Description:
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/// Given a list of 3D polygons, a choice of X, Y, or Z, and a cut list, `cuts`, splits all of the polygons where they cross
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/// X/Y/Z at any value given in cuts.
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/// Arguments:
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/// polys = A list of 3D polygons to split.
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/// dir_ind = slice direction, 0=X, 1=Y, or 2=Z
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/// cuts = A list of scalar values for locating the cuts
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function _slice_3dpolygons(polys, dir, cuts) =
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assert( [for (poly=polys) if (!is_path(poly,3)) 1] == [], "Expects list of 3D paths.")
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assert( is_vector(cuts), "The split list must be a vector.")
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assert( in_list(dir, ["X", "Y", "Z"]))
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let(
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I = ident(3),
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dir_ind = ord(dir)-ord("X")
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chk_axis = assert(in_list(axis,["X","Y","Z"])),
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//vnf = vnf_triangulate(vnf),
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verts = vnf[0],
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bounds = pointlist_bounds(verts),
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bmin = bounds[0],
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bmax = bounds[1],
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dflt = axis=="Z"?
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max(abs(bmax.y), abs(bmin.y)) :
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max(abs(bmax.z), abs(bmin.z)),
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r = get_radius(r=r,d=d,dflt=dflt),
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extent = axis=="X" ? [bmin.y, bmax.y] : [bmin.x, bmax.x]
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)
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flatten([for (poly = polys)
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let(
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plane = plane_from_polygon(poly),
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normal = point3d(plane),
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pnormal = normal - (normal*I[dir_ind])*I[dir_ind]
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)
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approx(pnormal,[0,0,0]) ? [poly] :
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let (
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pind = max_index(v_abs(pnormal)), // project along this direction
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otherind = 3-pind-dir_ind, // keep dir_ind and this direction
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keep = [I[dir_ind], I[otherind]], // dir ind becomes the x dir
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poly2d = poly*transpose(keep), // project to 2d, putting selected direction in the X position
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poly_list = [for(p=_split_2dpolygons_at_each_x([poly2d], cuts))
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let(
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a = p*keep, // unproject, but pind dimension data is missing
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ofs = outer_product((repeat(plane[3], len(a))-a*normal)/plane[pind],I[pind])
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)
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a+ofs] // ofs computes the missing pind dimension data and adds it back in
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)
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poly_list
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]);
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span_chk = axis=="Z"?
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assert(bmin.y > 0 || bmax.y < 0, "Entire shape MUST be completely in front of or behind y=0.") :
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assert(bmin.z > 0 || bmax.z < 0, "Entire shape MUST be completely above or below z=0."),
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steps = ceil(segs(r) * (extent[1]-extent[0])/(2*PI*r)),
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step = (extent[1]-extent[0]) / steps,
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bend_at = [for(i = [1:1:steps-1]) i*step+extent[0]],
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slicedir = axis=="X"? "Y" : "X", // slice in y dir for X axis case, and x dir otherwise
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sliced = vnf_slice(vnf, slicedir, bend_at),
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coord = axis=="X" ? [0,sign(bmax.z),0] : axis=="Y" ? [sign(bmax.z),0,0] : [sign(bmax.y),0,0],
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new_vert = [for(p=sliced[0])
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let(a=coord*p*180/(PI*r))
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axis=="X"? [p.x, p.z*sin(a), p.z*cos(a)] :
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axis=="Y"? [p.z*sin(a), p.y, p.z*cos(a)] :
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[p.y*sin(a), p.y*cos(a), p.z]]
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// ) vnf_triangulate([new_vert,sliced[1]]);
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) [new_vert,sliced[1]];
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// Section: Debugging Polyhedrons
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