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fix: smoothed normal qnan handling & more stable smoothed normals for imprecise geometry w/ long thin faces

pull/257/head
tszirr 2014-04-21 23:12:51 +02:00
parent 0a01da7242
commit 25c2dd58de
1 changed files with 7 additions and 6 deletions
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13
code/GenVertexNormalsProcess.cpp
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@ -142,7 +142,7 @@ bool GenVertexNormalsProcess::GenMeshVertexNormals (aiMesh* pMesh, unsigned int
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]];
const aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1)).Normalize();
const aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1));
for (unsigned int i = 0;i < face.mNumIndices;++i) {
pMesh->mNormals[face.mIndices[i]] = vNor;
@ -209,18 +209,19 @@ bool GenVertexNormalsProcess::GenMeshVertexNormals (aiMesh* pMesh, unsigned int
// Get all vertices that share this one ...
vertexFinder->FindPositions( pMesh->mVertices[i] , posEpsilon, verticesFound);
aiVector3D vr = pMesh->mNormals[i];
float vrlen = vr.Length();
aiVector3D pcNor;
for (unsigned int a = 0; a < verticesFound.size(); ++a) {
const aiVector3D& v = pMesh->mNormals[verticesFound[a]];
aiVector3D v = pMesh->mNormals[verticesFound[a]];
// check whether the angle between the two normals is not too large
// HACK: if v.x is qnan the dot product will become qnan, too
// therefore the comparison against fLimit should be false
// in every case.
if (v * pMesh->mNormals[i] < fLimit)
continue;
pcNor += v;
if (v * vr >= fLimit * vrlen * v.Length())
pcNor += v;
}
pcNew[i] = pcNor.Normalize();
}