void PathVolumeInfo::Update(const BSDFEvent eventType, const BSDF &bsdf) {
// Update only if it isn't a volume scattering and the material can TRANSMIT
if (bsdf.IsVolume())
scatteredStart = true;
else {
scatteredStart = false;
if(eventType & TRANSMIT) {
if (bsdf.hitPoint.intoObject)
AddVolume(bsdf.GetMaterialInteriorVolume());
else
RemoveVolume(bsdf.GetMaterialInteriorVolume());
}
}
}
bool PathVolumeInfo::ContinueToTrace(const BSDF &bsdf) const {
// Check if the volume priority system has to be applied
if (bsdf.GetEventTypes() & TRANSMIT) {
// Ok, the surface can transmit so check if volume priority
// system is telling me to continue to trace the ray
// I have to continue to trace the ray if:
//
// 1) I'm entering an object and the interior volume has a
// lower priority than the current one (or is the same volume).
//
// 2) I'm exiting an object and I'm not leaving the current volume.
const Volume *bsdfInteriorVol = bsdf.GetMaterialInteriorVolume();
// Condition #1
if (bsdf.hitPoint.intoObject && CompareVolumePriorities(currentVolume, bsdfInteriorVol))
return true;
// Condition #2
//
// I have to calculate the potentially new currentVolume in order
// to check if I'm leaving the current one
if ((!bsdf.hitPoint.intoObject) && currentVolume && (SimulateRemoveVolume(bsdfInteriorVol) == currentVolume))
return true;
}
return false;
}
