Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: romullus on 2015-12-15, 22:10:41

Title: Polyurethane foam material
Post by: romullus on 2015-12-15, 22:10:41

I'm a bit struggling to create believable polyurethane foam material. If i wouldn't in a hurry, i'd probably just sit down on it until i'd crack it, but i don't have much time at this moment, so if anybody could help - i'd be very thankfull.

Title: Re: Polyurethane foam material
Post by: racoonart on 2015-12-15, 22:49:16

I saw a method where people just tightly stacked dozens of planes on top of each other with noise maps in the opacity slot (maybe even here in the forum somewhere)

Title: Re: Polyurethane foam material
Post by: romullus on 2015-12-15, 23:05:16

Yes, i know it too. It's on the forum. But i'm affraid this tehcnique is too expensive for me. I can't afford to render anything with opacity or displacement in this scene :[ I'd like to do it as light as possible.

https://forum.corona-renderer.com/index.php/topic,5154.msg35427.html#msg35427

Title: Re: Polyurethane foam material
Post by: Lucutus on 2015-12-16, 08:51:27

Maybe a combination of diffuse texture, bump, specularity and SSS could do also, but i dont think this would be less "expensive".

greetz

Lucutus

Title: Re: Polyurethane foam material
Post by: romullus on 2015-12-16, 10:34:22

Yes, you're right. I think my main mistake was that i went straight ahead to SSS. Now i opted it with opacity as per aforementioned link and already results are much nicer if not faster. Thank you both for help!

Title: Re: Polyurethane foam material
Post by: maru on 2015-12-16, 15:19:32

Here is my setup. Sorry that it's a bit "dirty". :) I'm not satisfied with it, but maybe it will serve as some inspiration.
btw, the falloff in translucency fraction slot seems to produce nice results, especially on leaves

Title: Re: Polyurethane foam material
Post by: NicoB on 2015-12-16, 15:42:04

Hej,

nice starting point, maru.
I would also recommend using AO with inverted normal "mode" for saturation (desaturation).
As you can notice on romullus reference, this is important.

Also the very bright reflection parts in the reference are very important.
But I now have no idea reproducing this effect.

Maybe another approach would be some kind of vector displacement.
As the material exists out of small blisters, that are truncated..

Hope it helps :)

All the best

Title: Re: Polyurethane foam material
Post by: romullus on 2015-12-16, 16:05:00

Luckily i just finished my work with this project. But nonetheless i'll take a look at your material and try to construct something for my humble material library.

Thank you everybody for your input! It was very helpful.

Title: Re: Polyurethane foam material
Post by: polygon3di on 2019-04-04, 21:40:48

I`ve got a lesson about stuff like this(https://cdn1.imggmi.com/uploads/2019/4/4/d273b1e71a296d50c3c7477650b0bbf4-full.jpg)