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16.7 LPE to create passes for caustics, direct and indirect light

 
In some situations you want to get separate passes for caustics, direct or indirect light only.
 
Use this LPE to get only the caustic lighting effect = L.*SDE
 
Caustics only = L.*SDE
 
 
Use this LPE to get only the contribution of the direct lighting effect = L.?E
 
Direct light contribution only = L.?E
 
 
Use this LPE to get only the contribution of the indirect lighting effect = L.{2,}E
 
Indirect light contribution only = L.{2,}E