D3DXSHDot

Computes the dot product of two spherical harmonic (SH) vectors.

FLOAT D3DXSHDot(
  UINT Order,
  CONST FLOAT * pA,
  CONST FLOAT * pB
);

Parameters

Order

[in] Order of the spherical harmonic (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] Pointer to the first SH vector.

pB

[in] Pointer to the second SH vector.

Return Values

SH output coefficients.

Remarks

Each coefficient of the basis function Y_lm 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: Declared in D3dx9math.h.

See Also

Precomputed Radiance Transfer