bugfix the three vertices are collinear when converting a polygon to a triangle.

Signed-off-by: Jackie9527 <80555200+Jackie9527@users.noreply.github.com>
pull/4979/head
Jackie9527 2023-02-25 10:10:03 +08:00
parent 90333340d6
commit f7f54036f2
1 changed files with 15 additions and 0 deletions

View File

@ -468,6 +468,21 @@ bool TriangulateProcess::TriangulateMesh( aiMesh* pMesh)
continue; continue;
} }
// Skip when three point is in a line
aiVector2D left = *pnt0 - *pnt1;
aiVector2D right = *pnt2 - *pnt1;
left.Normalize();
right.Normalize();
auto mul = left * right;
// if the angle is 0 or 180
if (std::abs(mul - 1.f) < ai_epsilon || std::abs(mul + 1.f) < ai_epsilon) {
// skip this ear
ASSIMP_LOG_WARN("Skip a ear, due to its angle is near 0 or 180.");
continue;
}
// and no other point may be contained in this triangle // and no other point may be contained in this triangle
for ( tmp = 0; tmp < max; ++tmp) { for ( tmp = 0; tmp < max; ++tmp) {