material test -gummibears

[odina]

hi everybody,
i did a small test with interpolated glossy refraktion, nothing special just to
get used to the v 1.46 ...

[nvanherpt]

things seem a bit blurry?

i don't like orange flavoured ones much

[tom schuelke]

Thats good.

I love the orange ones best. so you can take all the others

[Syclone1]

Great work on the bears _

-dave

[s0real]

i'll take the red ones!

are gummi bears really that transparent?
i don't think they are, although i must admit i haven't eaten any for oh, probably fifteen years!

[odina]

...thats too long ago, definatly !

thank you guys for the comments -i know, they aren't perfect...

the problem is the sss-fake (with glossy refractions):
the more translucent the body gets, the more glossy does it look.
also the volumetric look isn't that realistic in my opinion (no backsides shining through...)
here is a little update



building process :

[RErender]

have you tried it with translucency, my experience is that it is quite fast in the latest releses.

[Syclone1]

looking better but they still look to shiney...

-dave

[taboo]

i think 1.46 is completely different than 1.09.03 release in terms of having glossy refractions.
i am not sure if it is a bug, or vray team has some new ideas with it under 1.46 but;
When you put IOR to 1.0 and give a fog, it renders as it was before. But when you give glossiness to that, it doesnt consider the fog color. It becomes completely white. Maybe it is a bug , or maybe it is a major change in the workflow.

Here are some test;

Vray 1.09.03r
IOR = 1.0
Refraction Glossiness = 1.0



Vray 1.09.03r
IOR = 1.0
Refraction Glossiness = 0.6



Vray 1.46.10
IOR = 1.0
Refraction Glossiness = 1.0



Vray 1.46.10
IOR = 1.0
Refraction Glossiness = 0.6



well, i am sure it is a bug, but if it is not, i like the way how vray 1.09.03 works.

[odina]

hey taboo,
i think its not a bug ?! for me its logical i think, the glossiness controls the refraktion color NOT the fog color, if its white then the geometry gets white too, i had a falloff map in my refraction slot (glossiness 0,7-0,8 ) with a very small amount of color instead of pure white ...

i worked also on the reflektions and now it looks a little better i think...

[Syclone1]

Nice, thats looking alot better.

-dave

[taboo]

well still i dont understand really. Why we have the fog than if it is not working when we use glossy refraction.

to be honest, i like the way that 1.09.03 works.
that way it is really extreamly easy to fake SSS.

[trixian]

To elaborate on what taboo is trying to say: Why are the refractions not tinted by the fog colour when the refractions are glossy? There is a breach in the logic there wouldn't you say odina?

[blueplanet]

care to share material?

odina,

I've been watching your post for about a week now and wanted to ask if you might be willing to send
me your gummibear shader material...?

I recently did a couple renderings of a design we're finalizing for a customer appreciation mailing.
It's a paperweight we will send to our valued clients.

I was never really satisfied with the material I created for the images you see below,
although they convey the intent of the design adequately.





The teapot will be laser etched inside a block of glass.
Each paperweight will be sequentially numbered, wrapped in a nice velvet bag and then sent to those
clients who patronize our company every year.

I think I can tweek your material to get a better result with my renderings.

Can you send me a scene file or material library? I'd really appreciate it.

If you wish, you may PM me!

Bye bye!

Naomi E. Bonaparte
blue planet design

[egz]

I have to agree with taboo, that sure looks like a bug. Glossy refractions control what happens at the surface, and fog controls what happens inside the object, they shouldn't really affect each other at all.