Sprizz glass - vray shader test

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Old 06 June 2006   #1
Sprizz glass - vray sss cocktail

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
Attached Images
File Type: jpg 3dsprizz9.jpg (49.5 KB, 172 views)
File Type: jpg settings.jpg (40.8 KB, 75 views)
File Type: jpg reference.jpg (54.4 KB, 152 views)

Last edited by NiZu : 06 June 2006 at 12:41 PM.
 
Old 06 June 2006   #2
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
 
Old 06 June 2006   #3
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
Attached Images
File Type: jpg 3dsprizz10s.jpg (68.4 KB, 87 views)

Last edited by NiZu : 06 June 2006 at 06:47 PM.
 
Old 06 June 2006   #4
It's all about refractions ... 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.

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.
Attached Images
File Type: jpg 3dsprizz14s.jpg (78.1 KB, 55 views)
 
Old 06 June 2006   #5
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.
 
Old 07 July 2006   #6
Last update

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/p.jpeg

Last edited by NiZu : 07 July 2006 at 11:06 AM.
 
Old 07 July 2006   #7
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