See also Using the Cavity Ambient Occlusion filter.
Specifies the radius of a sampling area (in screen space). Occlusion artifacts are possible when the radius is set incorrectly in relation to the features on the model. For example, large features can be missed if the radius is set too small, or small features can be missed if the radius is set too large.
Specifies the distance the sampling rays travel from the sampling point into the scene to determine the presence of occluding objects. Decrease this value and the Sample Radius if you do not achieve an acceptable ambient occlusion effect on small objects. In most situations, the Cutoff Radius value should be kept lower than the Sample Radius.
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