void AddMaterials(KFbxMesh* pMesh)
{
    int i;
 
    //get the node of mesh, add material for it.
    KFbxNode* lNode = pMesh->GetNode();
    if(lNode == NULL)
        return;
 
    // cube has 6 faces with the same material
    for (i = 0; i < 6; i++ )
    {
        lNode->AddMaterial(gMaterial);
    }
}