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/* RCSid $Id$ */ |
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/* |
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================================================================== |
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Photon map support routines for scattering by materials. |
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#include "pmap.h" |
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/* |
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Checks for paths already accounted for in photon map to avoid |
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Check for paths already accounted for in photon map to avoid |
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double-counting during backward raytracing. |
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ambRayInPmap(): Check for DIFFUSE -> (DIFFUSE|SPECULAR) -> * |
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subpaths. These occur during the backward pass |
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when an ambient ray spawns an indirect diffuse or |
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specular ray. These subpaths are already |
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accounted for in the global photon map. |
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shadowRayInPmap(): Check for DIFFUSE -> SPECULAR -> LIGHT |
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subpaths. These occur during the backward pass |
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when a shadow ray is transferred through a |
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accounted for by caustic photons in the global, |
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contrib, or dedicated caustic photon map. |
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*/ |
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/* |
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#define ambRayInPmap(r) ((r) -> crtype & AMBIENT && \ |
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((photonMapping && \ |
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(ambounce < 0 || (r) -> rlvl > 1)) || \ |
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causticPhotonMapping || contribPhotonMapping)) |
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*/ |
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#define ambRayInPmap(r) 0 |
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#define shadowRayInPmap(r) ((r) -> crtype & SHADOW && \ |
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photonMapping) |
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(ambounce < 0 || ((r) -> crtype & AMBIENT ? \ |
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photonMapping : causticPhotonMapping))) |
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/* Check if scattered ray spawns a caustic photon */ |
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#define PMAP_CAUSTICRAY(r) ((r) -> rtype & SPECULAR) |
