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View Full Version : Sprizz glass - vray shader test

NiZu
06-12-2006, 01:37 PM
Hi everybody!
I'm submitting this wip image for critique about the liquid shader.
It's a glass of 'Sprizz' (a typical venetian drink) :

The 'real' material is a 1/3 schweppes, 1/3 white wine, 1/3 Aperol (that gives the deep orange color) (>>see: reference.jpg)
My vray shader is a mix of a vray material and an eggz wax shader. (>>see: settings.jpg)
The light settings: two vray globes and a hdri sky . The sky is a mix between a real photo and cg hdri with wavy bands for chrome effects.

Still.., i'm not yet satisfied with the results , as you can see from the reference photo , my render lacks of that wavy-yellow reflections.. (or are they caustics..or what?)

Any suggestion?
Thanks, hope you'll find this interesting..

Ni.Zu

nizu.cgsociety.org (http://nizu.cgsociety.org)
Kickflipkid687
06-12-2006, 02:01 PM
IT looks really really close, but the only things u could fix are

-Greater highlights, it looks somewhat dull
-some kind of displacement or wave in the liquid
-not such a blurry image


-Matt
NiZu
06-12-2006, 04:22 PM
thanx,
Good suggestions, i reduced dof, i was wondering on how to add "wavynes"...
I tried an output map to increase (to 1.6) refraction output level and it worked pretty well (highlights -actually refractions- aren't dull anymore, i think)

About displacement , i thought it worked like bump maps.. on the external shape of objects, so how to apply it to the refractions? can anyone point me to a tutorial for this?


Ni.Zu
NiZu
06-13-2006, 12:40 PM
It's all about refractions ... :rolleyes: I should have known a trasparent material can't reflect that much, indeed what matters is what you see thru..

I looked again at the reference and i noticed those waves are simply the edge of the metal dish behind the glass.. (warped according to the index of refraction)

I made a quick test with a striped black and white plane behind the glass and Boom...there it was.:buttrock:

In the attached pic the effect is a little dimmer because the dish i modelled it's not so contrasted.


More critiques?
Thanx and good work.
JCAddy
06-13-2006, 03:40 PM
I think the first image looks more like a photograph than the othe rtwo. The reflection / refraction in the 2nd and 3rd images look way too strong and you're getting some weird black reflection in the back of the glass. Looks very CG IMO.
NiZu
07-11-2006, 11:04 AM
Hi, the first looks more photographic yes, but doesn't match the reference material at all!
This is the final version , if there are no more suggestions..


http://picserver.org/i/QN0772O79752/128/p.jpeg
http://picserver.org/i/QN0772O79752/p.jpeg
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