# SphericalHarmonics.EvaluateSphericalLight Method ()

Evaluates a spherical light and returns spectral spherical harmonic (SH) data.

**Overload List**

**Remarks**

Evaluates a spherical light and returns spectral SH data. There is no normalization of the intensity of the light like there is for directional lights, so care has to be taken when specifying the intensities. This will compute three spectral samples;

redOutputwill be returned, whilegreenOutputandblueOutputmay be returned.On the sphere with unit radius as shown, direction can be specified simply with

theta, the angle about thez-axis in the right-handed direction, andphi, the angle fromz.The following equations show the relationship between Cartesian (

x,y,z) and spherical (theta,phi) coordinates on the unit sphere. The anglethetavaries over the range of 0 to 2pi, whilephivaries from 0 topi.

Exceptions

The method call is invalid. For example, a method's parameter might contain an invalid value.