SSS Question or problem

SSS Question or problem#320132

By adamwade - Wed Mar 10, 2010 2:46 am

- Wed Mar 10, 2010 2:46 am #320132

I am going to assume my question is dumb, but I'm having trouble with SSS and making a nice frosted translucent plastic. I have done the 2.02 patch and Rhino 4.0 SR7. This sample is using the stock MXM honey on the right and the left is the same material with roughness changed to 20 (original is 0). It seems that when I try to add roughness everything goes black. If I crank up the coef. to like 1500 then the material brightens up, but is very waxy and opaque.

Maybe I'm missing something?

Adam Wade
Vice President Design
LDA, LLC
http://www.ldallc.com

Re: SSS Question or problem#320133

By JDHill - Wed Mar 10, 2010 3:56 am

- Wed Mar 10, 2010 3:56 am #320133

Sorry, I was busy and forgot to respond to this when you originally posted about it on the Rhino forum. I am not seeing this behavior here using the standard 'sss' preview scene, so is it possibly related to this piece of geometry? What happens there if you import the sss_honey.mxm into the plugin, set the preview scene to 'sss', roughness to 20.0, and render the preview?

Next Limit Team

Re: SSS Question or problem#320175

By adamwade - Wed Mar 10, 2010 9:41 pm

- Wed Mar 10, 2010 9:41 pm #320175

Yeah, the preview is fine (see jpg). I simplified the geometry and did another comparison. Somehow the multiple walls are acting strange with roughness. I can do roughness 0 and add a bump map and it seems to work OK, just not with roughness.

Adam Wade
Vice President Design
LDA, LLC
http://www.ldallc.com

Re: SSS Question or problem#320190

By JDHill - Wed Mar 10, 2010 11:45 pm

- Wed Mar 10, 2010 11:45 pm #320190

Looks pretty weird to me -- would it be possible for you to zip the .3dm and send it over (jeremy at nextlimit dot com) so I could take a look?

Next Limit Team

Re: SSS Question or problem#320195

By adamwade - Thu Mar 11, 2010 1:04 am

- Thu Mar 11, 2010 1:04 am #320195

No problem - just sent it.

Adam Wade
Vice President Design
LDA, LLC
http://www.ldallc.com

Re: SSS Question or problem#320223

By JDHill - Thu Mar 11, 2010 8:38 pm

- Thu Mar 11, 2010 8:38 pm #320223

Thanks -- so you know, I'm not sure why it's behaving that way (it doesn't look right to me), but we're looking into it.

Next Limit Team

Re: SSS Question or problem#320885

By adamwade - Mon Mar 22, 2010 10:22 pm

- Mon Mar 22, 2010 10:22 pm #320885

JD,

Apparently, based on another SSS question, it was stated that SSS is not functioning properly with emitters or sun. It is working only with image based lighting. I disabled my lights and assigned an HDRI and it rendered fine.

Now, can this be fixed. Uhhhh, no WHEN will this be fixed. I can imagine that SSS is difficult, but it seems to be an on again off again feature.

Adam Wade
Vice President Design
LDA, LLC
http://www.ldallc.com

Re: SSS Question or problem#320890

By JDHill - Tue Mar 23, 2010 12:01 am

- Tue Mar 23, 2010 12:01 am #320890

I didn't see anything particularly strange here and so forwarded your file on to the core developers. I had not tried to check out the emitters vs. IBL angle though, so thanks for posting back about that. I'll see what I can find out, status-wise.

Next Limit Team

Re: SSS Question or problem#334596

By tom - Wed Dec 15, 2010 11:21 pm

- Wed Dec 15, 2010 11:21 pm #334596

adamwade wrote:Now, can this be fixed. Uhhhh, no WHEN will this be fixed. I can imagine that SSS is difficult, but it seems to be an on again off again feature.

This is fixed in 2.5