Transforms the 3D vector normal by the given matrix.
D3DXVECTOR3* D3DXVec3TransformNormal( _Inout_ D3DXVECTOR3 *pOut, _In_ const D3DXVECTOR3 *pV, _In_ const D3DXMATRIX *pM );
- pOut [in, out]
Pointer to the D3DXVECTOR3 that is the result of the operation.
- pV [in]
Type: const D3DXVECTOR3*
Pointer to the source D3DXVECTOR3 structure.
- pM [in]
Type: const D3DXMATRIX*
Pointer to the source D3DXMATRIX structure.
Pointer to a D3DXVECTOR3 structure that is the transformed vector.
This function transforms the vector (pV->x, pV->y, pV->z, 0) by the matrix pointed to by pM.
If you want to transform a normal, the matrix you pass to this function should be the transpose of the inverse of the matrix you would use to transform a point.
The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXVec3TransformNormal function can be used as a parameter for another function.