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 (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.

Requirements

Header: Declared in D3dx9math.h.

Library: Use D3dx9.lib.