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The following diagram illustrates the incidentRaySpread and incidentRayRadius properties of the ray which are related to ray differentials, and are important to the computation of filter widths for antialiasing.

The next diagram illustrates an incident ray and potential reflected rays and transmitted rays that may be returned by a Bxdf as the next indirect ray fired by an integrator. Here, the green lines represent a side view of the tessellated micropolygon geometry. Note that the geometric normal

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Ngn and the micropolygon size

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mpsize is derived directly from the tessellated representation, while

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the biasR and biasT variables can be used to bias the origins of the indirect rays.

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getprimvar getprimvar

Primitive Variables

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