D3DXVec3TransformNormal

Transforms the 3D vector normal by the given matrix.

D3DXVECTOR3 * D3DXVec3TransformNormal(
  D3DXVECTOR3 * pOut,
  CONST D3DXVECTOR3 * pV,
  CONST D3DXMATRIX * pM
);

Parameters

pOut

[in, out] Pointer to the D3DXVECTOR3 structure that is the result of the operation.

pV

[in] Pointer to the source D3DXVECTOR3 structure.

pM

[in] Pointer to the source D3DXMATRIX structure.

Return Values

Pointer to a D3DXVECTOR3 structure that is the transformed vector.

Remarks

This function transforms the vector normal (x, y, z, 0) of the vector, pV, by the matrix, 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.

Requirements

Header: Declared in D3dx9math.h.