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External sources alias sampler (#3201)

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Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
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Ebny Walid Ahammed 2024-11-23 13:10:39 -06:00 • committed by GitHub
parent dd01c40ae1
commit 2d988a69a1
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6 changed files with 30 additions and 16 deletions
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7
src/settings.cpp
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@ -563,6 +563,13 @@ void read_settings_xml(pugi::xml_node root)
model::external_sources.push_back(make_unique<FileSource>(path));
}
// Build probability mass function for sampling external sources
vector<double> source_strengths;
for (auto& s : model::external_sources) {
source_strengths.push_back(s->strength());
}
model::external_sources_probability.assign(source_strengths);
// If no source specified, default to isotropic point source at origin with
// Watt spectrum. No default source is needed in random ray mode.
if (model::external_sources.empty() &&