D3DXMatrixReflect function (D3DX10Math.h)

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

Syntax

D3DXMATRIX* D3DXMatrixReflect(
  _Inout_       D3DXMATRIX *pOut,
  _In_    const D3DXPLANE  *pPlane
);

Parameters

pOut [in, out]

Type: D3DXMATRIX*

Pointer to the D3DXMATRIX structure that is the result of the operation.

pPlane [in]

Type: const D3DXPLANE*

Pointer to the source D3DXPLANE.

Return value

Type: D3DXMATRIX*

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

See also

Math Functions