How to render a reflection object mask in glass

[q976431]

Can light path expressions be completed?
I hope it can be attached through the rendering elements of the finished product without having to render many times

[hermit.crab]

You can't create a mask with LPEs, but you can extract the specific object's reflection, correct it as you wish, and compose it on top. This should be the LPE code, where the label is set in the object in the reflection:

C<R[GS]>.'label'+L

[q976431]

You can't create a mask with LPEs, but you can extract the specific object's reflection, correct it as you wish, and compose it on top. This should be the LPE code, where the label is set in the object in the reflection:

C<R[GS]>.'label'+L

thank you. I tried to understand this expression, but it was too complicated. I haven't learned yet. Thanks for your help

[hermit.crab]

If you are interested you can read more here.