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

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