LPE questions

[bardo]

I'm exploring the LPE feature and I've some questions.
I've a test scene of an interior and I've added, as testing, 2 spheres with a full reflection material.
I've added different labels for each sphere.

With this setup, my question is:
Is it possible to extract just the background reflection of the sphere A and the full reflections of the sphere B in the same render element? or have I to add a second render element and use one formula for each one?
If yes, how can I combine the 2 formulas?

And this my litle 2 cents about a possible development.
I think that, due to the fine tuning of this feature (LPE), it could be nice to have a more "interactive" way to create formulas.
I know that it's a feature that, at the moment, it's more oriented to technical people that they really know what they're doing, but a more smarter "LPE builder" could be a really good tool for people more "artistic" oriented.
Something like the LPE Builder but interactively in the 3dsmax (or any DCC supported) viewport.


Anyway, it's already a great tool, in my daily job I'll use it very rarely but, if I should need it, it's great to have this surgical control.

[hermit.crab]

There is a preset for the full contribution available; the background reflection formula should look like this:

C((<RG>+B)|(<RS>+B))

Regarding the intractability of the feature, there is a dedicated LPE builder page for that, though a visualization might be a good idea.

EDIT: See the second post.

[bardo]

Thank you.
Now it's more clear.

[hermit.crab]

Actually, my bad, you can do combine the different data in one pass (where the objects are labelled). Like so:

C((<R[GS]'sphere1'>B)|(<R[GS]'sphere2'>.*))

[bardo]

Oh, nice.
I've tried something similar but with no luck... clearly I haven't got yet full understanding how it works.

Thank you for your tip.