Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: jnoy01 on 2014-10-10, 16:21:49

Title: Gummi Bear
Post by: jnoy01 on 2014-10-10, 16:21:49

Hi folks,

I've been trying to make a decent looking gummi bear texture. For the life of me, I can't seem to land on settings which look realistic and interesting. I usually use Mental Ray native to Max 2014/2015, but just discovered Corona. Can anyone recommend a material which would work well at least as a starting point?

It's such a confusing material, with the way some are nearly see-through, yet they scatter color and make lights glow inside the bodies.

Reference pictures:

http://grinandbakeit.com/wp-content/uploads/2010/01/gummi-glass-tipped-close.jpg (http://grinandbakeit.com/wp-content/uploads/2010/01/gummi-glass-tipped-close.jpg)

http://www.acclaimmag.com/wp-content/uploads/2014/01/2074903820_1375612450.jpg (http://www.acclaimmag.com/wp-content/uploads/2014/01/2074903820_1375612450.jpg)

http://1.bp.blogspot.com/-igHp789-qvc/Uet7OCN6p4I/AAAAAAAAPFQ/mQccg7n7TnM/s1600/gummy-bear-jello.jpg (http://1.bp.blogspot.com/-igHp789-qvc/Uet7OCN6p4I/AAAAAAAAPFQ/mQccg7n7TnM/s1600/gummy-bear-jello.jpg)


Attached are renderings I made after hours of attempts, but I don't feel like it's anywhere *near* a proper material. The pineapple looks really muddy and neither have the sort of highlighting I'd expect from gelatin. Anyone ever created something as mind-boggling as this substance and able to offer guidance?


Thanks!

Title: Re: Gummi Bear
Post by: romullus on 2014-10-10, 17:24:22

Public alpha versions don't have SSS, which is needed to replicate such material. Soon to be released commercial version have proper SSS, though.

Title: Re: Gummi Bear
Post by: borisquezadaa on 2014-10-10, 17:35:11

How about add some gloss texture to it?
And gelatin has some caustics on them also. (I'm a big fan of caustics).

Title: Re: Gummi Bear
Post by: jnoy01 on 2014-10-10, 17:40:57

Hm! Well, I have a bump map driving some texture to the highlights which are glossy. I thought I was using Caustics, but maybe I haven't set it up properly for that. I have it enabled on the material, anyway. Settings for the red gummi attached.

Title: Re: Gummi Bear
Post by: borisquezadaa on 2014-10-10, 18:04:37

I would not go with absortion with these guys... check attached. I think refraction color is enough. Maybe you could add a little gloss reflection plus a hard one using a blend material. Cheking reflections on gummy bears look like it.

(Waiting for GGX shader)...

Title: Re: Gummi Bear
Post by: arrival on 2014-10-10, 19:47:29

some weeks ago i convert a vray scene with gummi bears :-)
not very realistic for extrem closeups i think,but not bad without sss

Title: Re: Gummi Bear
Post by: jnoy01 on 2014-10-10, 19:56:43

Quote from: borisquezadaa on 2014-10-10, 18:04:37

I would not go with absortion with these guys... check attached. I think refraction color is enough. Maybe you could add a little gloss reflection plus a hard one using a blend material. Cheking reflections on gummy bears look like it.

(Waiting for GGX shader)...

I really like how this looks, and it's a fantastic starting point. Wouldn't absorption better mimic a fake SSS, though?

Quote from: arrival on 2014-10-10, 19:47:29

some weeks ago i convert a vray scene with gummi bears :-)
not very realistic for extrem closeups i think,but not bad without sss

Wow, that's almost exactly the texture! Would you mind sharing your material or the scene?

Title: Re: Gummi Bear
Post by: arrival on 2014-10-10, 20:11:58

max 2014?

Title: Re: Gummi Bear
Post by: jnoy01 on 2014-10-10, 20:46:38

Yep, I have both max 2014 and max 2015.

Title: Re: Gummi Bear
Post by: borisquezadaa on 2014-10-10, 21:42:53

Another entry... XD.
Hope this helps finding the rigth material.

Title: Re: Gummi Bear
Post by: arrival on 2014-10-10, 21:56:10

here's the file,but comes without the hdri,sorry !

Title: Re: Gummi Bear
Post by: Ludvik Koutny on 2014-10-13, 19:08:31

Actually, gummy bears do not need SSS. The media they are made of is quite clear afaik. There may be some SSS, but not very noticeable amount. Glossy refraction should do the trick in this particular case.

Title: Re: Gummi Bear
Post by: maru on 2014-10-13, 20:32:59

Yeah, gummy bears are REFRACTIVE!
I think the hardest parts may be:
-proper IOR
-proper reflective and refractive glossiness
-some gummy bears have a flour-like powder covering them (corn flour?), maybe adding this as a falloff map would help
-realistic wrinkles

btw, there are many different types of gummy bears. If you are referring to Haribo mini bears, then the pictures posted here are pretty close, they are mostly refractive

Title: Re: Gummi Bear
Post by: jnoy01 on 2014-10-20, 16:15:20

Thanks for all your help, guys! Unfortunately, I wound up with a client who doesn't really understand refraction and kept trying to have me remove "the dark parts" until it just looked like a piece of glass. After that, she had me light it from the front only to get really hot highlights, ruining the glow from backlighting. Then she didn't like that it no longer looked soft.

In the end, I even had to switch back to Mental Ray to make the deadline with an outsourced render farm. :\

Still, I appreciate the feedback and support! I'm going to keep an eye on Corona and keep playing with it when I can. It's really great. :D

Title: Re: Gummi Bear
Post by: borisquezadaa on 2014-10-20, 16:57:24

Damn those clients... always giving us hard time. XD.

Title: Re: Gummi Bear
Post by: maru on 2014-10-20, 17:41:23

Interactive rendering is great for tweaking stuff like that. :)

Title: Re: Gummi Bear
Post by: borisquezadaa on 2014-10-20, 18:02:27

But... but... it's not for everyone... :(