D3DXSHAdd function
Adds two spherical harmonic (SH) vectors; in other words, pOut[i] = pA[i] + pB[i].
Syntax
FLOAT* D3DXSHAdd( _Out_ FLOAT *pOut, _In_ UINT Order, _In_ const FLOAT *pA, _In_ const FLOAT *pB );
Parameters
- pOut [out]
-
Type: FLOAT*
Pointer to SH output coefficients. The evaluation generates Order² coefficients. 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.
- pA [in]
-
Type: const FLOAT*
Pointer to the first SH vector.
- pB [in]
-
Type: const FLOAT*
Pointer to the second SH vector.
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
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See also