Heckbert’s Photon Path Grammer

Glossary

NotationMeaning
Lemission from the light source
Sspecular reflection or transmission
Ddiffuse (ie. non-specular) reflection or transmission
Vvolume scattering
{ x | y | z }one of x, y, or z ( x, y, z is one element in the set{L, S, D, V} )
x+one or several repeats of x
x*zero or several repeats of x

Examples

Photon Mapping

Photon Map TypesPhoton Path
1. Caustic Photon MapL S+ D
2. Global Photon MapL {S|D|V}* D
3. Volume Photon MapL {S|D|V}+ V

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