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D3DXMatrixReflect function

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

Header

D3DX10Math.h

Library

D3DX10.lib

See also

Math Functions

 

 

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