Volumetric/SSS rendering playground

[bograt]

Has anyone else had problems like this?
some Metals also seem to also have a wierd dark edge but presumably for different reasons. I cant seem to get rid of it unless I make the attenuation colour very dark.
Thanks

Jules

[maru]

Could you be more specific? What "problem" do you mean? The dark edges? Can you show material setup? Did you use some kind of smoothing for the geometry or is it just a standard newly created Box?

[bograt]

Sorry. Yes I mean the dark outer edges. In all of my tests I have not been able to get rid of this.
This material has 2mm attenuation, 128 gray attenuation color and 128 gray scattering color. The box is just a newly generated box, the other geometry was re-smoothed using 'auto-smooth'
This effect remains even when the corners have been chamfered, it seems like the problem is consistent with sharp corners in general

[maru]

I am getting completely different results. Is this 3ds or C4D? Can you show material setup screenshot or post your scene in max15 or older format?

[Alessandro]

I am getting completely different results. Is this 3ds or C4D? Can you show material setup screenshot or post your scene in max15 or older format?

+1, max 2015 corona 1.01, it runs correctly

[bograt]

All render settings default, Corona version: 1.01.00 3dsMax 2015

[maru]

Pff, easy. :) Internal reflections. Either set reflectivity to 1 or refraction glossiness to 1 to get rid of this. You can see this even when scattering/absorption is disabled.

btw, either this is not Corona 1.1 or this scene was made with an older version - 1.1 does not have the "legacy A7" checkbox. Check your version in system > about Corona.

[bograt]

One more:
Render settings default, standard cube 40x40x40mm, white scene environment, same material as before.
I cant help but feeling it is down to the fact that there is no coefficient parameter. when I remove the scattering effect the cube renders pure black because of the very shallow attenuation.

[bograt]

With receptivity as one it is much better I must admit:
When I posted material snip I was using version 1.00.02.
I have always used Maxwell render for sss so these artifacts are new to me. Thanks for the help!

[maru]

Depending on what "real life" material you are trying to mimic, you could also use translucency for this.