LPE Object Tag

[Dubbie99]

Is there any way to use object tags with Vray for Houdini?

Using the LPE tag field in the object/render tab doesn't seem to do anything.

I am trying to make a pass that only includes refracted rays from a particular emissive object.

[Dubbie99]

Would be good to know if this is possible or not, so I can pursue a different solution.

[chakarov]

Hello Dubbie99 , lpe labels could be specified in V-Ray Object Properties for objects, or in V-Ray Material ID VOP - per material.

[Dubbie99]

Thanks Georgy!

[Dubbie99]

Sorry to bug again, but could I see a sample scene?
No matter what I do, my tagged object or material just renders black in the light select pass.

[chakarov]

Sure, here it is

[Dubbie99]

Thanks again Georgy.
The sample file was very helpful. It showed me the error I had.
The screenshot above showed lpe_label='obj1' That didn't work, but omitting the quotes does: lpe_label=obj1

I am wondering if you can also help me out with an expression. I am trying to come up with a LPE that will give me the refraction of a certain object.

For example, I have obj1 that is visible through a glass object, I want a pass that ONLY shows obj1 (refracted) and nothing else.
Is this possible?

Thanks,

Rhys.

[Dubbie99]

just a bump.

[chakarov]

Hello Dubbie99 and really sorry about this late reply. Here is an example of how to mask refractions of material.
C<T[GS]'mrefrMat'>+<RD'geoLabel'>.*
this will output only refracted geoLabel object in refrMat material

[Dubbie99]

Thanks very much Chakarov!

[bender83]

Curious how is this done at an object level in Solaris itself?

[bdancer]

> Curious how is this done at an object level in Solaris itself?

Not sure I got the question. How to setup the label? It's in geometry render settings.

[bender83]

That was it, thanks