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forbid odd-length tristrips in general

This commit is contained in:
David Rose 2005-03-31 22:02:12 +00:00
parent b31d8eadd7
commit 1d9df0ce98
1 changed files with 11 additions and 7 deletions
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18
panda/src/egg/eggMesherStrip.cxx
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@ -635,13 +635,17 @@ mate_pieces(EggMesherEdge *common_edge, EggMesherStrip &front,
bool EggMesherStrip::
mate_strips(EggMesherEdge *common_edge, EggMesherStrip &front,
EggMesherStrip &back, EggMesherStrip::PrimType type) {
// If we're flat-shaded, we don't allow ending up with an odd-length
// strip.
if (front._flat_shaded &&
((front._type != PT_tri && back._type == PT_tri) ||
(front._type == PT_tri && back._type != PT_tri) ||
(front._type == PT_tristrip && back._type == PT_tristrip &&
((front._verts.size() + back._verts.size()) & 1) != 0))) {
// We don't allow making odd-length strips at all. Odd-length
// strips can't be rotated if they're flat-shaded, and they can't be
// joined end-to-end using degenerate triangles. So forget 'em.
// This might not be the right place to impose this rule, because it
// tends to end up with lots of independent triangles in certain
// kinds of meshes, but it's the easiest place to impose it.
if ((front._type != PT_tri && back._type == PT_tri) ||
(front._type == PT_tri && back._type != PT_tri) ||
(front._type == PT_tristrip && back._type == PT_tristrip &&
((front._verts.size() + back._verts.size()) & 1) != 0)) {
return false;
}