Brecht Van Lommel
ac51d331df
* Split light types into own files, move light type specific code from light tree and MNEE. * Move flat light distribution code into own kernel file and host side building function, in preparation of light tree addition. Add light/sample.h as main entry point to kernel light sampling. * Better separate calculation of pdf for selecting a light, and pdf for sampling a point on the light. The selection pdf is now also stored in LightSampling for MNEE to correctly recalculate the full pdf when the shading position changes but the point on the light remains fixed. * Improvement to kernel light storage, using packed_float3, better variable names, etc. Includes contributions by Brecht Van Lommel and Weizhen Huang. Ref T77889
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