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fix slice timing. fix slice ambiguity on edge lines

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This commit is contained in:
Stewart Allen 2020-11-26 09:42:12 -05:00
commit 3508dffdf2
6 changed files with 17 additions and 10 deletions
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8
src/kiri/slicer2.js
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@ -233,8 +233,12 @@
if (where.under.length === 3 || where.over.length === 3) {
// does not intersect (all 3 above or below)
} else if (where.on.length === 2) {
// one side of triangle is on the Z plane
lines.push(makeZLine(phash, where.on[0], where.on[1], false, true));
// one side of triangle is on the Z plane and 3rd is below
// drop lines with 3rd above because that leads to ambiguities
// with complex nested polygons on flat surface
if (where.under.length === 1) {
lines.push(makeZLine(phash, where.on[0], where.on[1], false, true));
}
} else if (where.on.length === 3) {
// triangle is coplanar with Z
// we drop these because this face is attached to 3 others