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D3DXSHRotate function

Rotates the spherical harmonic (SH) vector by the given matrix.

Syntax


FLOAT* D3DXSHRotate(
  _Out_  FLOAT *pOut,
  _In_   UINT Order,
  _In_   const D3DXMATRIX *pMatrix,
  _In_   const FLOAT *pIn
);

Parameters

pOut [out]

Type: FLOAT*

Pointer to Spherical harmonic (SH) output coefficients. The evaluation generates Order2 coefficients. This pointer should not alias with pIn. See Remarks.

Order [in]

Type: UINT

Order of the SH evaluation. Must be in the range of D3DXSH_MINORDER to D3DXSH_MAXORDER, inclusive. The evaluation generates Order2 coefficients. The degree of the evaluation is Order - 1.

pMatrix [in]

Type: const D3DXMATRIX*

Pointer to the rotation matrix. The rotation sub-matrix must be orthogonal, with a unit determinant.

pIn [in]

Type: const FLOAT*

Pointer to rotated SH coefficients.

Return value

Type: FLOAT*

Pointer to SH output coefficients.

Remarks

Each coefficient of the basis function Ylm is stored at memory location l2 + m + l, where:

  • l is the degree of the basis function.
  • m is the basis function index for the given l value and ranges from -l to l, inclusive.

Requirements

Header

D3dx9math.h

Library

D3dx9.lib

See also

Precomputed Radiance Transfer (Direct3D 9)

 

 

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