In the documentation for the light path expressions (Arnold for maya) under custom light path expressions what does this refer to exactly?
"Custom light path expressions are added to options.light_path_expressions, and can then be used as AOVs in options.outputs."
Where is "options.outputs"? Is it an attribute or in a script somewhere? I can't see anything obvious.
thanks
Do you mean this page? https://docs.arnoldrenderer.com/x/rQAnAg
That's in the Arnold docs, not MtoA (Arnold for Maya).
options in an Arnold node, and light_path_expressions and outputs are parameters of the options node
MtoA translates your Maya scene to Arnold. The render settings become the options node, and your AOVs become options.outputs.
Apologies, I hadn't noticed I'd navigated away from the maya specific docs. Moving to general help.
To clarify, if someone else picks this up - I'd like to know where in Maya I can add the custom light path expression to use light groups as outlined on the above documentation page.
Create a custom AOV, load the AOV node into the Attribute Editor, and put a light path expression in the Light Path Expression box. For example, if you have a light group named "yellow", then put the light path expression C<L.'yellow'>