topic Re: aistandardvolume when set to blackbody emission does not work in Maya Forum

aistandardvolume when set to blackbody emission does not work

Bryant4863 — Mon, 08 Jul 2019 20:17:27 GMT

I was trying to create a smoke and fire simulation with bifrost aero and when aistandardvolume emission was set to black body this is what arnold renders. its a weird ring of light around the perimeter of the simulation, i tried messing with various settings but i have gotten nowhere.

Re: aistandardvolume when set to blackbody emission does not work

sean.heasley — Tue, 09 Jul 2019 16:18:24 GMT

Hi @Bryant4863

Is there a light in your scene?

Also, if you change the emission settings around does that affect it at all?

Re: aistandardvolume when set to blackbody emission does not work

mspeer — Tue, 09 Jul 2019 17:13:43 GMT

Hi!

This looks like clipping (values too high at center).

Re: aistandardvolume when set to blackbody emission does not work

sean.heasley — Wed, 10 Jul 2019 20:39:51 GMT

Hi @Bryant4863

Just wanted to check in to see how things were going. Are you still having this issue?

If your issue is resolved, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: aistandardvolume when set to blackbody emission does not work

Bryant4863 — Thu, 11 Jul 2019 07:06:01 GMT

hello, sorry for late reply, yes i am still having the issue i have messed with the settings for emission and when I clear the channel parameter it kinda fixes it but it has no emission, just smoke. I have a screenshot of the attributes before touching anything except for the blackbody selection

Re: aistandardvolume when set to blackbody emission does not work

sean.heasley — Thu, 11 Jul 2019 16:09:08 GMT

Hi @Bryant4863

Can you check the clipping values like @mspeer suggested?

Re: aistandardvolume when set to blackbody emission does not work

mspeer — Thu, 11 Jul 2019 19:07:11 GMT

Hi!

Usually Maya attributes operate in the range from "0" to "1".

The values used and generated (and emitted by the bifrost emitter if using default values) are way to high here.

So use an other mode or channel, or simply reduce attribute "Temperature" which acts as multiplier (try "0.001").

Re: aistandardvolume when set to blackbody emission does not work

Bryant4863 — Fri, 12 Jul 2019 05:33:38 GMT

okay, where would i find this value at?

Re: aistandardvolume when set to blackbody emission does not work

Bryant4863 — Fri, 12 Jul 2019 10:01:46 GMT

okay, so i found the solution and it was exactly as you said thank you very much 🙂