topic Re: How to add emission channel to carpaint shader in Arnold General Rendering Forum

How to add emission channel to carpaint shader

Anonymous — Thu, 18 Oct 2018 07:13:04 GMT

I noticed there is no emission channel in the carpaint shader. What's the best way to add emission to a shader without the channel?

Re: How to add emission channel to carpaint shader

lee_griggs — Thu, 18 Oct 2018 07:33:24 GMT

You could use a Mix shader. I'm curious as to why you would want to do that?

Re: How to add emission channel to carpaint shader

Anonymous — Fri, 19 Oct 2018 03:54:26 GMT

@Lee Griggs Would the best way to use the mixer shader be, to set the weight for all the channels in the standard shader to 0 except for the emission channel, and then add it to the carpaint shader?

Why wouldn't you want to do it? 🙂

Thanks!

Re: How to add emission channel to carpaint shader

lee_griggs — Fri, 19 Oct 2018 08:08:36 GMT

Yes and add a texture to the Mix Weight as a mask between the two.

>Why wouldn't you want to do it? 🙂

Hehe, ok you don't have to tell me why 😉

Re: How to add emission channel to carpaint shader

maxtarpini — Fri, 19 Oct 2018 18:06:10 GMT

you might have some overhead doing that (using a zero'ed aistandard) also that's not really necessary.

best workflow here is to use an aiBlackbody (in the 2nd slot of a mix shader) which is probably really there for this kind of stuff, then set mix shader to add (light is additive). eventually if you wanna know the long story have a read here ... https://en.wikipedia.org/wiki/Black-body_radiation