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volpath_simple: tweaked identifier and comments to make the previous commit a bit more understandable

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Wenzel Jakob 2012-10-20 12:05:23 -04:00
parent 8e2bfb7340
commit ac8c7ad6d7
1 changed files with 8 additions and 6 deletions
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14
src/integrators/path/volpath_simple.cpp
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@ -76,7 +76,7 @@ public:
MediumSamplingRecord mRec;
RayDifferential ray(r);
Spectrum Li(0.0f);
bool scattered = false;
bool nullChain = true;
Float eta = 1.0f;
/* Perform the first ray intersection (or ignore if the
@ -142,7 +142,7 @@ public:
ray = Ray(mRec.p, pRec.wo, ray.time);
ray.mint = 0;
scene->rayIntersect(ray, its);
scattered = true;
nullChain = false;
} else {
/* Sample
tau(x, y) * (Surface integral). This happens with probability mRec.pdfFailure
@ -219,15 +219,17 @@ public:
(rRec.type & RadianceQueryRecord::EIndirectSurfaceRadiance))
recursiveType |= RadianceQueryRecord::ERadianceNoEmission;
/* Recursively gather direct illumination? */
/* Recursively gather direct illumination? This is a bit more
complicated by the fact that this integrator can create connection
through index-matched medium transitions (ENull scattering events) */
if ((rRec.depth < m_maxDepth || m_maxDepth < 0) &&
(rRec.type & RadianceQueryRecord::EDirectSurfaceRadiance) &&
(bRec.sampledType & BSDF::EDelta) &&
!((bRec.sampledType & BSDF::ENull) && scattered)) {
(!(bRec.sampledType & BSDF::ENull) || nullChain)) {
recursiveType |= RadianceQueryRecord::EEmittedRadiance;
scattered = false;
nullChain = true;
} else {
scattered |= bRec.sampledType != BSDF::ENull;
nullChain &= bRec.sampledType == BSDF::ENull;
}
/* Potentially stop the recursion if there is nothing more to do */