// Deform the vertex array according to the links contained in the mesh and the skinning type.
void fbxLoader2::ComputeSkinDeformation(FbxAMatrix& pGlobalPosition, FbxMesh* pMesh, FbxTime& pTime, FbxPose* pPose, int frame)
{
FbxSkin * lSkinDeformer = (FbxSkin *)pMesh->GetDeformer(0, FbxDeformer::eSkin);
FbxSkin::EType lSkinningType = lSkinDeformer->GetSkinningType();
if(lSkinningType == FbxSkin::eLinear || lSkinningType == FbxSkin::eRigid)
{
ComputeLinearDeformation(pGlobalPosition, pMesh, pTime, pPose, frame);
}
else if(lSkinningType == FbxSkin::eDualQuaternion)
{
int i = 0;
ComputeDualQuaternionDeformation(pGlobalPosition, pMesh, pTime, pPose, frame);
}
else if(lSkinningType == FbxSkin::eBlend)
{
int lVertexCount = pMesh->GetControlPointsCount();
FbxVector4* lVertexArrayLinear = new FbxVector4[lVertexCount];
memcpy(lVertexArrayLinear, pMesh->GetControlPoints(), lVertexCount * sizeof(FbxVector4));
FbxVector4* lVertexArrayDQ = new FbxVector4[lVertexCount];
memcpy(lVertexArrayDQ, pMesh->GetControlPoints(), lVertexCount * sizeof(FbxVector4));
ComputeLinearDeformation(pGlobalPosition, pMesh, pTime, pPose, frame);
ComputeDualQuaternionDeformation(pGlobalPosition, pMesh, pTime, pPose, frame);
}
}
// Deform the vertex array according to the links contained in the mesh and the skinning type.
void compute_skin_deformation(FbxAMatrix& pGlobalPosition,
FbxMesh* pMesh,
FbxTime& pTime,
FbxVector4* pVertexArray,
FbxPose* pPose)
{
FbxSkin * lSkinDeformer = (FbxSkin *)pMesh->GetDeformer(0, FbxDeformer::eSkin);
FbxSkin::EType lSkinningType = lSkinDeformer->GetSkinningType();
if(lSkinningType == FbxSkin::eLinear || lSkinningType == FbxSkin::eRigid) {
compute_linear_deformation(pGlobalPosition, pMesh, pTime, pVertexArray, pPose);
} else if(lSkinningType == FbxSkin::eDualQuaternion) {
compute_dual_quaternion_deformation(pGlobalPosition, pMesh, pTime, pVertexArray, pPose);
} else if(lSkinningType == FbxSkin::eBlend) {
int lVertexCount = pMesh->GetControlPointsCount();
FbxVector4* lVertexArrayLinear = new FbxVector4[lVertexCount];
memcpy(lVertexArrayLinear, pMesh->GetControlPoints(), lVertexCount * sizeof(FbxVector4));
FbxVector4* lVertexArrayDQ = new FbxVector4[lVertexCount];
memcpy(lVertexArrayDQ, pMesh->GetControlPoints(), lVertexCount * sizeof(FbxVector4));
compute_linear_deformation(pGlobalPosition, pMesh, pTime, lVertexArrayLinear, pPose);
compute_dual_quaternion_deformation(pGlobalPosition, pMesh, pTime, lVertexArrayDQ, pPose);
// To blend the skinning according to the blend weights
// Final vertex = DQSVertex * blend weight + LinearVertex * (1- blend weight)
// DQSVertex: vertex that is deformed by dual quaternion skinning method;
// LinearVertex: vertex that is deformed by classic linear skinning method;
int lBlendWeightsCount = lSkinDeformer->GetControlPointIndicesCount();
for(int lBWIndex = 0; lBWIndex<lBlendWeightsCount; ++lBWIndex) {
double lBlendWeight = lSkinDeformer->GetControlPointBlendWeights()[lBWIndex];
pVertexArray[lBWIndex] = lVertexArrayDQ[lBWIndex] * lBlendWeight + lVertexArrayLinear[lBWIndex] * (1 - lBlendWeight);
}
}
}
