This is an implementation of the original D3DXMath library spherical harmonics math functions using DirectXMath.

See this blog post for more information and details.

API

All functions are in the C++ namespace DirectX

XMSHEvalDirection

Evaluates the Spherical Harmonic basis functions. Equivalent to D3DXSHEvalDirection function.

XMSHRotate

Rotates SH vector by a rotation matrix. Equivalent to the D3DXSHRotate function.

XMSHRotateZ

Rotates the SH vector in the Z axis by an angle. Equivalent to the D3DXSHRotateZ function.

XMSHAdd

Adds two SH vectors. Equivalent to the D3DXSHAdd function.

XMSHScale

Scales a SH vector. Equivalent to the D3DXSHScale function.

XMSHDot

Computes the dot product of two SH vectors. Equivalent to the D3DXSHDot function.

XMSHMultiply, XMSHMultiply2/3/4/5/6

Computes the product of two functions represented using SH. Equivalent to D3DXSHMultiply2, D3DXSHMultiply3, D3DXSHMultiply4, D3DXSHMultiply5, and D3DXSHMultiply6.

XMSHEvalDirectionalLight

Evaluates a directional light and returns spectral SH data. Equivalent to the D3DXSHEvalDirectionalLight function.

XMSHEvalSphericalLight

Evaluates a spherical light and returns spectral SH data. Equivalent to the D3DXEvalSphericalLight function.

XMSHEvalConeLight

Evaluates a light that is a cone of constant intensity and returns spectral SH data. Equivalent to the D3DXSHEvalConeLight function.

XMSHEvalHemisphereLight

Evaluates a light that is a linear interpolant between two colors over the sphere. Equivalent to the D3DXSHEvalHemisphereLight function.

SHProjectCubeMap

Projects a function represented in a cube map into spherical harmonics. Equivalent to the D3DX11SHProjectCubeMap function.

For DirectX 11, you must do #include <d3d11.h> before #include <DirectXSH.h>.

For DirectX 12, you must do #include <d3d12.h> before #include <DirectXSH.h>.