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change region_faces to vnf_from_region and move to vnf.scad

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remove secret merge option from vnf_triangulate
add examples
add vnf_clean_unrefs
This commit is contained in:
Adrian Mariano
2021-10-14 22:36:21 -04:00
parent acb65b3298
commit cd85b3b1f4
3 changed files with 130 additions and 83 deletions
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80
regions.scad
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@@ -381,82 +381,6 @@ function region_parts(region) =
// Section: Region Extrusion and VNFs
function _path_path_closest_vertices(path1,path2) =
let(
dists = [for (i=idx(path1)) let(j=closest_point(path1[i],path2)) [j,norm(path2[j]-path1[i])]],
i1 = min_index(subindex(dists,1)),
i2 = dists[i1][0]
) [dists[i1][1], i1, i2];
function _join_paths_at_vertices(path1,path2,v1,v2) =
let(
repeat_start = !approx(path1[v1],path2[v2]),
path1 = clockwise_polygon(polygon_shift(path1,v1)),
path2 = ccw_polygon(polygon_shift(path2,v2))
)
[
each path1,
if (repeat_start) path1[0],
each path2,
if (repeat_start) path2[0],
];
// Given a region that is connected and has its outer border in region[0],
// produces a polygon with the same points that has overlapping connected paths
// to join internal holes to the outer border. Output is a single path.
function _cleave_connected_region(region) =
len(region)==0? [] :
len(region)<=1? clockwise_polygon(region[0]) :
let(
dists = [
for (i=[1:1:len(region)-1])
_path_path_closest_vertices(region[0],region[i])
],
idxi = min_index(subindex(dists,0)),
newoline = _join_paths_at_vertices(
region[0], region[idxi+1],
dists[idxi][1], dists[idxi][2]
)
) len(region)==2? clockwise_polygon(newoline) :
let(
orgn = [
newoline,
for (i=idx(region))
if (i>0 && i!=idxi+1)
region[i]
]
)
assert(len(orgn)<len(region))
_cleave_connected_region(orgn);
// Function: region_faces()
// Usage:
// vnf = region_faces(region, [transform], [reverse], [vnf]);
// Description:
// Given a region, applies the given transformation matrix to it and makes a VNF of
// faces for that region, reversed if necessary.
// Arguments:
// region = The region to make faces for.
// transform = If given, a transformation matrix to apply to the faces generated from the region. Default: No transformation applied.
// reverse = If true, reverse the normals of the faces generated from the region. An untransformed region will have face normals pointing `UP`. Default: false
// vnf = If given, the faces are added to this VNF. Default: `EMPTY_VNF`
function region_faces(region, transform, reverse=false, vnf=EMPTY_VNF) =
let (
regions = region_parts(force_region(region)),
vnfs = [
if (vnf != EMPTY_VNF) vnf,
for (rgn = regions) let(
cleaved = path3d(_cleave_connected_region(rgn)),
face = is_undef(transform)? cleaved : apply(transform,cleaved),
faceidxs = reverse? [for (i=[len(face)-1:-1:0]) i] : [for (i=[0:1:len(face)-1]) i]
) [face, [faceidxs]]
],
outvnf = vnf_merge(vnfs)
) outvnf;
// Function&Module: linear_sweep()
@@ -564,8 +488,8 @@ function linear_sweep(region, height=1, center, twist=0, scale=1, slices,
) scale([sc,sc,1], p=rot(ang, p=path3d(path,h)))
]
) vnf_vertex_array(verts, caps=false, col_wrap=true, style=style),
for (rgn = regions) region_faces(rgn, move([0,0,-height/2]), reverse=true),
for (rgn = trgns) region_faces(rgn, move([0,0, height/2]), reverse=false)
for (rgn = regions) vnf_from_region(rgn, down(height/2), reverse=true),
for (rgn = trgns) vnf_from_region(rgn, up(height/2), reverse=false)
])
) reorient(anchor,spin,orient, cp=cp, vnf=vnf, extent=!anchor_isect, p=vnf);