topic Re: indirect_diffuse AOV contribution in Arnold General Rendering Forum

indirect_diffuse AOV contribution

Anonymous — Thu, 30 Apr 2020 23:00:39 GMT

Does the indirect_diffuse AOV contribute at all to a light's diffuse AOV?

If so, can this be turned off somehow?

Thanks,

Re: indirect_diffuse AOV contribution

Stephen.Blair — Fri, 01 May 2020 17:54:23 GMT

A light's diffuse AOV has both the direct and indirect contribution of that light.

If you don't want the indirect, can you use the light's diffuse_direct AOV?

Re: indirect_diffuse AOV contribution

Anonymous — Fri, 01 May 2020 19:28:07 GMT

Maybe. We normally set our light diffuse LPE to:

> world_key5Light_diffuse C<RD>.*<L.'key5Light'>

What would be the LPE for the 'diffuse_direct' ?

Thank you,

Re: indirect_diffuse AOV contribution

Stephen.Blair — Fri, 01 May 2020 20:35:16 GMT

The LPE for diffuse is C<RD>.*

and diffuse_direct is C<RD>.L

so for a light group AOV it should be C<RD>.<L.'key5Light'>

Re: indirect_diffuse AOV contribution

Anonymous — Sat, 02 May 2020 00:30:40 GMT

Hmm,okay, so you're leaving out the asterisk on purpose, yes?

So what would be the expression for the "indirect only" for a light group AOV?

Currently, i'm using:

> "world_key5Light_diffuse_indirect C<RD>[DSVOB].*<L.'key5Light'>"

but I get the feeling that's not correct...

Thank you,

Re: indirect_diffuse AOV contribution

Anonymous — Mon, 04 May 2020 18:07:58 GMT

Hmm,okay, so you're leaving out the asterisk on purpose, yes?

So what would be the expression for the "indirect only" for a light group AOV?

Currently, i'm using:

> "world_key5Light_diffuse_indirect C<RD>[DSVOB].*<L.'key5Light'>"

but I get the feeling that's not correct...

Thank you,

Re: indirect_diffuse AOV contribution

Stephen.Blair — Mon, 04 May 2020 18:28:16 GMT

Yes, I left of the asterisk because if I look at the built-in LPEs:

diffuse_direct = C<RD>L

diffuse_indirect = C<RD>[DSVOB].*

diffuse_indirect_key5Light would be the indirect for that light group, so your custom LPE output should match that

Re: indirect_diffuse AOV contribution

Anonymous — Mon, 04 May 2020 18:40:26 GMT

I see, okay, Thanks for clarifying that.

So this job is older and we're still using 5.1.0.1 on it, though newer productions

are either on 5.4.0.2 or 6.0.1.0, and it is possible we could shift version for this

particular set of shots.

So that said, using these LPEs...

>> "diffuse_direct_key5Light C<RD>.<L.'key5Light'>"
>> "diffuse_indirect_key5Light C<RD>[DSVOB].*<L.'key5Light'>"

...yield two AOV layers which are identical. Why would that be?

Thank you,

Re: indirect_diffuse AOV contribution

Anonymous — Mon, 04 May 2020 19:03:18 GMT

Just to add,

I've also found I get same results with 5.4.0.2 and 6.0.10.

Thanks,

Re: indirect_diffuse AOV contribution

Stephen.Blair — Tue, 05 May 2020 17:23:06 GMT

You don't have to specify a light path expression, you can use the AOV names

diffuse_direct_key5Light
diffuse_indirect_key5Light

And Arnold will automatically create the light group AOVs

So in an ASS file, the outputs would be

  "diffuse_direct_key5Light RGB my_filter my_driver"
  "diffuse_indirect_key5Light RGB my_filter my_driver"

Re: indirect_diffuse AOV contribution

Stephen.Blair — Tue, 05 May 2020 17:27:36 GMT

For direct, the LPE

 C<RD>.<L.'key5Light'>

should be

 C<RD><L.'key5Light'>

The . is any event, so that includes too much

Re: indirect_diffuse AOV contribution

Anonymous — Thu, 07 May 2020 18:45:58 GMT

Thank you very much, Stephen!