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| Description | |
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| Uniform | Rays are not weighted in any particular direction in the hemisphere above the shading point. |
| Cosine | Cosine distribution is commonly used to render ambient occlusion. |
Cosine Spread
Sample spread of rays when using cosine distribution. A value of 1.0 gives a perfect Lambertian distribution.
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Bias
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Direction
Add a directional bias to the normal vector. Values must be specified in world space.
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Bias Co-ordinate System
Name of bias direction co-ordinate system transform such as object, world or camera
Trace Set
Restrict ray tracing to a subset of objects defined by one or more trace groups