D3DXMatrixReflect

Builds a matrix that reflects the coordinate system about a plane.

D3DXMATRIX* D3DXMatrixReflect(
  D3DXMATRIX* pOut,
  CONST D3DXPLANE* pPlane
); 

Parameters

pOut

[in, out] Pointer to the D3DXMATRIX structure that is the result of the operation.

pPlane

[in] Pointer to the source D3DXPLANE structure.

Return Values

Pointer to a D3DXMATRIX structure that reflects the coordinate system about the source plane.

Remarks

This function normalizes the plane equation before it creates the reflected matrix.

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixReflect function can be used as a parameter for another function.

This function uses the following formula to compute the returned matrix.

P = normalize(Plane);

-2 * P.a * P.a + 1  -2 * P.b * P.a      -2 * P.c * P.a        0
-2 * P.a * P.b      -2 * P.b * P.b + 1  -2 * P.c * P.b        0
-2 * P.a * P.c      -2 * P.b * P.c      -2 * P.c * P.c + 1    0
-2 * P.a * P.d      -2 * P.b * P.d      -2 * P.c * P.d        1

Requirements

  Header: Declared in D3dx8math.h.
  Import Library: Use D3dx8.lib.