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Merge pull request #3838 from Garux/fixGenNormals 

consider aiProcess_FlipWindingOrder in aiProcess_GenNormals & aiProcess_GenSmoothNormals
pull/3839/head^2
Kim Kulling 2021-05-06 20:40:17 +02:00 committed by GitHub
parent 1c90d28f9b e120544978
commit b1b937ea79
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 8 additions and 0 deletions
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3
code/PostProcessing/GenFaceNormalsProcess.cpp
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@ -70,6 +70,7 @@ GenFaceNormalsProcess::~GenFaceNormalsProcess() {
// Returns whether the processing step is present in the given flag field.
bool GenFaceNormalsProcess::IsActive(unsigned int pFlags) const {
force_ = (pFlags & aiProcess_ForceGenNormals) != 0;
flippedWindingOrder_ = (pFlags & aiProcess_FlipWindingOrder) != 0;
return (pFlags & aiProcess_GenNormals) != 0;
}
@ -134,6 +135,8 @@ bool GenFaceNormalsProcess::GenMeshFaceNormals(aiMesh *pMesh) {
const aiVector3D *pV1 = &pMesh->mVertices[face.mIndices[0]];
const aiVector3D *pV2 = &pMesh->mVertices[face.mIndices[1]];
const aiVector3D *pV3 = &pMesh->mVertices[face.mIndices[face.mNumIndices - 1]];
if (flippedWindingOrder_)
std::swap( pV2, pV3 );
const aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1)).NormalizeSafe();
for (unsigned int i = 0; i < face.mNumIndices; ++i) {

1
code/PostProcessing/GenFaceNormalsProcess.h
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@ -80,6 +80,7 @@ public:
private:
bool GenMeshFaceNormals(aiMesh* pcMesh);
mutable bool force_ = false;
mutable bool flippedWindingOrder_ = false;
};
} // end of namespace Assimp

3
code/PostProcessing/GenVertexNormalsProcess.cpp
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@ -70,6 +70,7 @@ GenVertexNormalsProcess::~GenVertexNormalsProcess() {
// Returns whether the processing step is present in the given flag field.
bool GenVertexNormalsProcess::IsActive(unsigned int pFlags) const {
force_ = (pFlags & aiProcess_ForceGenNormals) != 0;
flippedWindingOrder_ = (pFlags & aiProcess_FlipWindingOrder) != 0;
return (pFlags & aiProcess_GenSmoothNormals) != 0;
}
@ -142,6 +143,8 @@ bool GenVertexNormalsProcess::GenMeshVertexNormals(aiMesh *pMesh, unsigned int m
const aiVector3D *pV1 = &pMesh->mVertices[face.mIndices[0]];
const aiVector3D *pV2 = &pMesh->mVertices[face.mIndices[1]];
const aiVector3D *pV3 = &pMesh->mVertices[face.mIndices[face.mNumIndices - 1]];
if (flippedWindingOrder_)
std::swap( pV2, pV3 );
const aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1)).NormalizeSafe();
for (unsigned int i = 0; i < face.mNumIndices; ++i) {

1
code/PostProcessing/GenVertexNormalsProcess.h
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@ -104,6 +104,7 @@ private:
/** Configuration option: maximum smoothing angle, in radians*/
ai_real configMaxAngle;
mutable bool force_ = false;
mutable bool flippedWindingOrder_ = false;
};
} // end of namespace Assimp