|
|
|
|
SphericalHarmonics.EvaluateConeLight Method |
Language: |
Evaluates a light that is a cone of constant intensity and returns spectral spherical harmonic (SH) data.
Evaluates a light that is a cone of constant intensity and returns spectral SH data. The output vector is computed so that if the intensity ratio R/G/B is equal to 1, the exit radiance of a point directly under the light (oriented in the cone direction on a diffuse object with an albedo of 1) would be 1.0. This will compute 3 spectral samples; redOutput will be returned, while greenOutput and blueOutput may be returned.
On the sphere with unit radius as shown, direction can be specified simply with theta, the angle about the z-axis in the right-handed direction, and phi, the angle from z.
The following equations show the relationship between Cartesian (x, y, z) and spherical (theta, phi) coordinates on the unit sphere. The angle theta varies over the range of 0 to 2 pi, while phi varies from 0 to pi.
Exceptions
InvalidCallException The method call is invalid. For example, a method's parameter might contain an invalid value.
Send comments about this topic to Microsoft. © Microsoft Corporation. All rights reserved.
Feedback? Please provide us with your comments on this topic.
For more help, visit the DirectX Developer Center