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Fixing quad encoding

pull/3695/head
Clement Jacob 2021-03-29 15:31:48 +02:00
parent 6d1a0c6054
commit 81019d5e58
1 changed files with 7 additions and 3 deletions
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10
code/PostProcessing/TriangulateProcess.cpp
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@ -246,6 +246,7 @@ bool TriangulateProcess::TriangulateMesh( aiMesh* pMesh)
// emitted triangle, we use the opposite vertex which also happens to work
// for tri-fanning a concave quad.
// ref: https://github.com/assimp/assimp/pull/3695#issuecomment-805999760
unsigned int start_vertex = 0;
for (unsigned int i = 0; i < 4; ++i) {
const aiVector3D& v0 = verts[face.mIndices[(i+3) % 4]];
@ -265,13 +266,16 @@ bool TriangulateProcess::TriangulateMesh( aiMesh* pMesh)
const float angle = std::acos(left*diag) + std::acos(right*diag);
if (angle > AI_MATH_PI_F) {
// i is the concave point
// ngon encoding: if the concave vertex is same as last triangle first index,
// then we chose the opposite vertex.
start_vertex = (face.mIndices[i] != prev_first_indice) ? i : ((i+2) % 4);
start_vertex = i;
break;
}
}
// ngon encoding: if vertex is same as last triangle first index,
// then we chose the opposite vertex (works for both concave & convex quad).
if (face.mIndices[start_vertex] == prev_first_indice)
start_vertex = (start_vertex+2) % 4;
const unsigned int temp[] = {face.mIndices[0], face.mIndices[1], face.mIndices[2], face.mIndices[3]};
aiFace& nface = *curOut++;