Extracting skin data from an FBX file - c++

Question

I need to convert animation data from Autodesk's FBX file format to one that is compatible with DirectX; specifically, I need to calculate the offset matrices for my skinned mesh. I have written a converter( which in this case converts .fbx to my own 'scene' format ) in which I would like to calculate an offset matrix for my mesh. Here is code:
//
// Skin
//
if(bHasDeformer)
{
// iterate deformers( TODO: ACCOUNT FOR MULTIPLE DEFORMERS )
for(int i = 0; i < ncDeformers && i < 1; ++i)
{
// skin
FbxSkin *pSkin = (FbxSkin*)pMesh->GetDeformer(i, FbxDeformer::eSkin);
if(pSkin == NULL)
continue;
// bone count
int ncBones = pSkin->GetClusterCount();
// iterate bones
for (int boneIndex = 0; boneIndex < ncBones; ++boneIndex)
{
// cluster
FbxCluster* cluster = pSkin->GetCluster(boneIndex);
// bone ref
FbxNode* pBone = cluster->GetLink();
// Get the bind pose
FbxAMatrix bindPoseMatrix, transformMatrix;
cluster->GetTransformMatrix(transformMatrix);
cluster->GetTransformLinkMatrix(bindPoseMatrix);
// decomposed transform components
vS = bindPoseMatrix.GetS();
vR = bindPoseMatrix.GetR();
vT = bindPoseMatrix.GetT();
int *pVertexIndices = cluster->GetControlPointIndices();
double *pVertexWeights = cluster->GetControlPointWeights();
// Iterate through all the vertices, which are affected by the bone
int ncVertexIndices = cluster->GetControlPointIndicesCount();
for (int iBoneVertexIndex = 0; iBoneVertexIndex < ncVertexIndices; iBoneVertexIndex++)
{
// vertex
int niVertex = pVertexIndices[iBoneVertexIndex];
// weight
float fWeight = (float)pVertexWeights[iBoneVertexIndex];
}
}
}
How do I convert the fbx transforms to a bone offset matrix?