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The parameters in this section configure some details in the behaviour of glossy materials and optimisations for use with mirror reflections.
This is the degree to which the highlights are sampled for rough specular materials. A value of one means that all highlights will be fully sampled using distributed ray tracing. A value of zero means that no jittering will take place, and all reflections will appear sharp even when they should be diffuse. This may be desirable when used in combination with image sampling (see Pixel Sample Spacing [-ps]) to obtain faster renderings.
This is the minimum fraction of reflection or transmission, under which no specular sampling is performed. A value of zero means that highlights will always be sampled by tracing reflected or transmitted rays. A value of one means that specular sampling is never used. Highlights from light sources will always be correct, but reflections from other surfaces will be approximated using an ambient value. A sampling threshold between zero and one offers a compromise between image accuracy and rendering time.
Limit reflections to a maximum of this value.
Limit the weight of each ray to a minimum of this value. During ray-tracing, a record is kept of the final contribution a ray would have to the image. If it is less then the specified minimum, the ray is not traced.
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