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<type event 'group'>
|Scattering event specified by scattering type, scattering event, or lpe group|
|Light, i.e. analytic and geometric lights|
|Emissive object, i.e. camera visible lights and material glow|
|A period will match any relevant event|
|Transmission or refraction|
|Diffuse lobes (D1 to D4)|
|Specular/Glossy lobes (S1 to S8)|
|User lobes used to output material properties (U1 to U12)|
|( )||Parentheses allow grouping of a sequence of LPE events|
||||A vertical bar separates alternatives|
|[ ]||Square brackets that match any one of the enclosed events|
|Square brackets that match any one event not contained within the brackets|
|An asterisk will match the preceding event zero or more times|
|A plus sign will match the preceding event one or more times|
|Curly brackets that match the preceding event exactly n times|
|Curly brackets that match the preceding event min or more times|
|Curly brackets that match the preceding event at least min but not more than max times|
An LPE group (lpegroup) allows us to specify which objects we want to be use for an LPE channel. The attributes can be added in RenderMan plugins using the software's menu system such as PrmanObjectSettings in Katana.
- In the documentation examples we often use <L.> means Light scattering type with all scattering events. For light group AOVs, using <L.> is required instead in place of L. There's no functional difference.
- lpe:CD<L.> means camera with diffuse scattering event for light scattering type.
- lpe:CO means camera with emissive objection (since emissive does not need any light, there is no L).