How to isolate reflection contribution using LPE?

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Hi,

I am trying to isolate the reflection and refraction contribution of an object separately using LPE. How can I do this?

I added LPE tag to my object at the HDA level which has a geometry subnet inside. So I added a tag there too but no matter what combination of this I try, I get a blank image pass:

lpe:C<RG>.*+<O.'object'>


My object is phantom though, not sure if that matters.


Thanks in advance.
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