Add a discussion of the difference between entering/exiting light transport

AcademySoftwareFoundation / OpenPBR

Specification and reference implementation for the OpenPBR Surface shading model

Apache License 2.0

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Add a discussion of the difference between entering/exiting light transport #168

Closed portsmouth closed 3 months ago

portsmouth commented 4 months ago

Based on https://github.com/AcademySoftwareFoundation/OpenPBR/issues/110.

I added this discussion as a sub-section of the "Reduction to a mixture of lobes" section, as it is also quite technical and seems to make the most sense in the context of trying to do an implementation of the layering.