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A valid expression starts from the camera (C), captures ray spawn and scattering events and ends at light (L), emissive object (O) or the environment (B).
Ray spawn events other than than C or or V can be combined with scattering types (e.g. <RD> - capture only diffuse reflection) to get a more specific ray event or they can be used directly (e.g. R - capture reflections of any scattering type. This is also equivalent to <R.>)
Ray termination events can also be combined with each other when you want to capture the contribution of a light together with emissive objects, e.g. C<RD>.*[LO] will capture the GI coming from lights or emissive objects.
See a full list of LPE Symbols below:
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Presets
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A number of presets are available for Light Path Expressions.
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