GetSkinnedTrianglePositions ( FSkeletalMeshAccessorHelper& Acces..., int32 Tri, FVector3f& OutPos0, FVector3f& OutPos1, FVector3f& OutPos2, FVector3f& OutPrev0, FVector3f& OutPrev1, FVector3f& OutPrev2, int32& Idx0, int32& Idx1, int32& Idx2 )