The maximum number of reflected rays can be controlled via the Maximum number of secondary rays text field, which is found under the Ray Release and Propagation section for the physics interface.
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If Always is selected, whenever a ray hits the material discontinuity, the incident ray is refracted across the boundary, and a reflected ray is produces using some of the preallocated degrees of freedom for secondary rays.
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If Never is selected, the incident ray is refracted, but no reflected ray is produced. This does not prevent a ray from undergoing total internal reflection at the boundary.
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If Based on logical expression is selected, enter a value or expression for the Evaluation expression e (dimensionless). The default is 1. A reflected ray is produced only if the value of this expression is nonzero for the incident ray.
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