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[gltf2-exporter] Adding FB_ngon_encoding support

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This commit is contained in:
Clement Jacob
2021-03-10 09:48:12 +01:00
parent 3880cd225c
commit 8e589221d7
4 changed files with 32 additions and 0 deletions
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11
code/PostProcessing/TriangulateProcess.cpp
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@@ -217,10 +217,21 @@ bool TriangulateProcess::TriangulateMesh( aiMesh* pMesh)
// if it's a simple point,line or triangle: just copy it
if( face.mNumIndices <= 3)
{
// ngon encoding: making sure that triangles are not recognized as false ngons.
// To do so, we make sure the first indice is not the same as previous triangle emitted.
unsigned int prev_first_indice = (unsigned int)-1;
if (curOut != out) prev_first_indice = (curOut - 1)->mIndices[0];
aiFace& nface = *curOut++;
nface.mNumIndices = face.mNumIndices;
nface.mIndices = face.mIndices;
if (nface.mIndices[0] == prev_first_indice) {
// rotate indices to avoid ngon encoding false ngons
std::swap(nface.mIndices[0], nface.mIndices[2]);
std::swap(nface.mIndices[1], nface.mIndices[2]);
}
face.mIndices = nullptr;
continue;
}