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 Description
UniformRays are not weighted in any particular direction in the hemisphere above the shading point.
CosineCosine distribution is a 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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Falloff

Falloff values greater than zero create a softer look. Values less than zero give a hard edge when combined with max distance.can be used to control the softness of the occlusion effect.

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