Milk?

cookieofdoom · Post by **cookieofdoom** » Thu Jan 22, 2009 7:53 am

I'm trying to make a glass of milk. I used the settings seen here...
http://www.indigorenderer.com/joomla/fo ... light=milk

but after almost two hours on a triple core (almost 500spp) it's still wonky. It looks like smoothing isn't enabled and the whole thing is horribly discolored. Am I not waiting long enough? I know the color thing is fairly normal, but it looks like I can see the individual polygons. I'm posting this here, because I figure sss might have changed a lot since that thread... if anyone has a better mat, maybe you could post it? Thanks.

I'm using Blender 2.48a, blendigo, Indigo 1.1.17 Linux x64.

pixie · Post by **pixie** » Thu Jan 22, 2009 8:47 am

It looks odd, but it's even more odd the fact it hasn't any glass around it

cookieofdoom · Post by **cookieofdoom** » Thu Jan 22, 2009 9:16 am

I'm trying to speed up the process.

Haven't started modeling yet, just trying to get the mat down.

Borgleader · Post by **Borgleader** » Thu Jan 22, 2009 11:23 am

Looks like you forgot to press "Set smooth" on your mesh. Did you set a cauchy coeff?

cookieofdoom · Post by **cookieofdoom** » Thu Jan 22, 2009 11:42 am

It looks exactly like I forgot set smooth... but I didn't. That's what's confusing me. I didn't set a cauchy coeff... should I have?

CTZn · Post by **CTZn** » Thu Jan 22, 2009 12:20 pm

Milk is slow enough so that you want to be sure that your geometries are ok... wich doesn't seem to be the case. Test the mesh with a simple diffuse; probably the smoothing issue would stay the same: redo then the shape.

Milk is slow no matter what, its absorbtion is rather low (energy remains high longer) while the light is sent from bounce to bounce within the medium in a frenetic fashion, I guess it is finding an exit more hardly than it would with lower scattering.

I'm wondering why the blendigo values differ so much from the doc appendice B, but I never tried to use the later data actually.

cookieofdoom · Post by **cookieofdoom** » Thu Jan 22, 2009 12:53 pm

Alright, I'll let it render a bit longer. I didn't get that effect when I rendered it as just a normal mesh, so I'm guessing it's just an illusion and it will go away after a bit. If it's not gone after 3-4 hours, I'll post back... I may try using the preview scene, too.

Zom-B · Post by **Zom-B** » Thu Jan 22, 2009 5:23 pm

If you want to speed up stuff mate, try this 1337 trick of my:

Why do you render so much BG???

I would also look at this part of the Wiki, reed and use the Information about large_mutation_prob & Co, your render can benefit from this

My personal feeling about SSS is simply to avoid it where ever you can, it is ultra slow and not optimized and also buggy afaik! But poorly you guys where not interested in voting for it link

cookieofdoom · Post by **cookieofdoom** » Fri Jan 23, 2009 4:26 am

Yeah, rendering so much background for a test shot was pretty dumb, I realize. I used the matDB preview scene and I got the attached. I'm starting to think it's a bug? Maybe I should try Linux 32 or Windows 64 versions?

PureSpider · Post by **PureSpider** » Fri Jan 23, 2009 5:09 am

I know of this behavoiur like forever... never considered it a bug though...
I have my own material preview scene which works just awesome with milk... so I think the medium is not the problem

cookieofdoom · Post by **cookieofdoom** » Fri Jan 23, 2009 6:26 am

If I'm using the material seen here http://www.indigorenderer.com/joomla/fo ... lk_175.png should I be getting these results? Or am I using the wrong material?

PureSpider · Post by **PureSpider** » Fri Jan 23, 2009 6:49 am

There is a very good milk material burried somewhere in an old thread, try that one

I can send it to you tomorrow if you can't find it

cookieofdoom · Post by **cookieofdoom** » Fri Jan 23, 2009 12:17 pm

I might have just figured it out. I've got something that after 3 hours is starting to almost resemble milk. This is a very good sign in my opinion. If it works, I'll post the results and the texture here. I'll probably run it overnight... I need to get one of those new Core i7's so I can just do this in 20 minutes.

I can dream, right?

Borgleader · Post by **Borgleader** » Fri Jan 23, 2009 1:03 pm

So i tried the same settings in Blendigo 1.1.4 & Inidigo 1.1.15 and i got similar results.

Kram1032 · Post by **Kram1032** » Sat Jan 24, 2009 11:18 am

ZomB: That quote wasn't fair: of COURSE, faster rendering. Most improvements, if they're not new features (sometimes even then) actually fasten things up. So does better SSS. "Faster rendering", seen like that, actually means "better materials", "better SSS" AND (a bit of) "other" at the same time!

Milk?

Milk?

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