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Improved vnf_validate() face intersection checks.

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Garth Minette 2021-03-16 00:07:05 -07:00
parent a7357f8ff9
commit d44c140fcb
1 changed files with 41 additions and 22 deletions
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63
vnf.scad
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@ -708,6 +708,7 @@ function vnf_validate(vnf, show_warns=true, check_isects=false) =
vnf = vnf_compact(vnf),
varr = vnf[0],
faces = vnf[1],
lvarr = len(varr),
edges = sort([
for (face=faces, edge=pair(face,true))
edge[0]<edge[1]? edge : [edge[1],edge[0]]
@ -744,6 +745,14 @@ function vnf_validate(vnf, show_warns=true, check_isects=false) =
],
issues = concat(big_faces, null_faces)
)
let(
bad_indices = [
for (face = faces, idx = face)
if (idx < 0 || idx >= lvarr)
_vnf_validate_err("BAD_INDEX", [idx])
],
issues = concat(issues, bad_indices)
) issues? issues :
let(
repeated_faces = [
for (i=idx(dfaces), j=idx(dfaces))
@ -802,34 +811,41 @@ function vnf_validate(vnf, show_warns=true, check_isects=false) =
) issues? issues :
let(
isect_faces = !check_isects? [] : unique([
for (i = [0:1:len(faces)-2])
for (j = [i+1:1:len(faces)-1]) let(
for (i = [0:1:len(faces)-2]) let(
f1 = faces[i],
poly1 = select(varr, faces[i]),
plane1 = plane3pt(poly1[0], poly1[1], poly1[2]),
normal1 = [plane1[0], plane1[1], plane1[2]]
)
for (j = [i+1:1:len(faces)-1]) let(
f2 = faces[j],
poly2 = select(varr, f2),
val = poly2 * normal1
)
if( min(val)<=plane1[3] && max(val)>=plane1[3] ) let(
plane2 = plane_from_polygon(poly2),
normal2 = [plane2[0], plane2[1], plane2[2]],
val = poly1 * normal2
)
if( min(val)<=plane2[3] && max(val)>=plane2[3] ) let(
shared_edges = [
for (edge1 = pair(f1,true), edge2 = pair(f2,true)) let(
e1 = edge1[0]<edge1[1]? edge1 : [edge1[1],edge1[0]],
e2 = edge2[0]<edge2[1]? edge2 : [edge2[1],edge2[0]]
) if (e1==e2) 1
for (edge1 = pair(f1, true), edge2 = pair(f2, true))
if (edge1 == [edge2[1], edge2[0]]) 1
]
)
if (!shared_edges) let(
plane1 = plane3pt_indexed(varr, f1[0], f1[1], f1[2]),
plane2 = plane3pt_indexed(varr, f2[0], f2[1], f2[2]),
line = plane_intersection(plane1, plane2)
)
if (!is_undef(line)) let(
poly1 = select(varr,f1),
isects = polygon_line_intersection(poly1,line)
isects = polygon_line_intersection(poly1, line)
)
if (!is_undef(isects))
for (isect=isects)
if (len(isect)>1) let(
poly2 = select(varr,f2),
isects2 = polygon_line_intersection(poly2,isect,bounded=true)
for (isect = isects)
if (len(isect) > 1) let(
isects2 = polygon_line_intersection(poly2, isect, bounded=true)
)
if (!is_undef(isects2))
for (seg=isects2)
for (seg = isects2)
if (seg[0] != seg[1])
_vnf_validate_err("FACE_ISECT", seg)
]),
@ -863,6 +879,7 @@ function vnf_validate(vnf, show_warns=true, check_isects=false) =
_vnf_validate_errs = [
["BIG_FACE", "WARNING", "cyan", "Face has more than 3 vertices, and may confuse CGAL"],
["NULL_FACE", "WARNING", "blue", "Face has zero area."],
["BAD_INDEX", "ERROR", "cyan", "Invalid face vertex index."],
["NONPLANAR", "ERROR", "yellow", "Face vertices are not coplanar"],
["DUP_FACE", "ERROR", "brown", "Multiple instances of the same face."],
["MULTCONN", "ERROR", "orange", "Multiply Connected Geometry. Too many faces attached at Edge"],
@ -909,13 +926,15 @@ module vnf_validate(vnf, size=1, show_warns=true, check_isects=false) {
pts = fault[4];
echo(str(typ, " ", err, " (", clr ,"): ", msg, " at ", pts));
color(clr) {
if (len(pts)==2) {
stroke(pts, width=size, closed=true, endcaps="butt", hull=false, $fn=8);
} else if (len(pts)>2) {
stroke(pts, width=size, closed=true, hull=false, $fn=8);
polyhedron(pts,[[for (i=idx(pts)) i]]);
} else {
move_copies(pts) sphere(d=size*3, $fn=18);
if (is_vector(pts[0])) {
if (len(pts)==2) {
stroke(pts, width=size, closed=true, endcaps="butt", hull=false, $fn=8);
} else if (len(pts)>2) {
stroke(pts, width=size, closed=true, hull=false, $fn=8);
polyhedron(pts,[[for (i=idx(pts)) i]]);
} else {
move_copies(pts) sphere(d=size*3, $fn=18);
}
}
}
}