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LPE EventsDescriptionExample
<type event 'group'>
Scattering event specified by scattering type, scattering event, or lpe groupC<.[DS]'floor'>[LO] matches all light paths from the floor lpe group
Light, i.e. analytic and geometric lightsC[DS]*<L'key'> matches all light paths from the key light group
Emissive object, i.e. camera visible lights and material glowC[DS]*O matches all emissive object light paths
Match A period will match any relevant LPE event<.D> where the period represents R or T
Scattering Types  
ReflectionC<R[DS]>[DS]*[LO] matches all reflected light paths
Transmission or refractionC<T[DS]>[DS]*[LO] matches all transmitted light paths
Scattering Events  
Diffuse lobes (D1 to D4)CD[DS]*[LO] matches all diffuse light paths
Specular/Glossy lobes (S1 to S8)CS[DS]*[LO] matches all specular light paths
User lobes used to output material properties (U1 to U12)CU2L matches the camera visible user2 lobe, typically albedo
( )Parentheses allow grouping of a sequence of LPE eventsCDSL, C(DS)L, and CD(SL) are all functionally the same
|A vertical bar separates alternativesCD|(SD)L matches direct diffuse or specular-diffuse light paths
[ ]Square brackets will that match any one of the enclosed LPE eventsC[D2D3]L matches direct diffuse2 or diffuse3 light paths
[^ ]
Match Square brackets that match any one LPE event that is not contained within the bracketsC[^D2D3]L matches all light paths besides diffuse2 and diffuse3 (including specular and user)
Match An asterisk will match the preceding event zero or more timesC[DS]*[LO] matches all light paths, including emissive
Match A plus sign will match the preceding event one or more timesC[DS]+[LO] matches direct and indirect light paths, but not emissive
Match Curly brackets that match the preceding event exactly n timesC<T[DS]>{2}[LO] matches double transmission light paths
Match Curly brackets that match the preceding event min or more timesC[DS]{2,}[LO] matches all indirect light paths
Match Curly brackets that match the preceding event at least min, but not more than max times.C[DS]{0,1}[LO] matches direct and emissive light paths