glass mtl

[priad]

Hi all, How to catch this kind of density in the glass (in the bottom)
I have try to made a glass mtl with fog, dispersion and glossy too with no result, must I put a sss mtl instead of it?
Any input Will be appreciated.
thanks

[elcabron]

try with some black bounces behind the bottle left and right
look here http://www.pixiq.com/article/product...glass-on-black
and then use dispersion check box

[jacksc02]

Maxwell

[simmsimaging]

Maxwell

It is sometimes hard to judge where the tone comes from. Could be the glass is milky, could be the white cards behind it doing a lot of it too. Often photographers will frost the back side of a glass bottle to diffuse light/reflections/refractions too. To get this look I would try with fairly clear glass and play with the stuff you see through it. It appears to have some smudgy stuff on the glass surface, but that could also be stuff on the actual reflectors you see in the glass.

To get that stuff you can try a map in the Reflection Glossiness (but minimal impact) and the same map (probably inverted) in the Reflection slot (also minimal impact) and you should get pretty close.

[elcabron]

just a try

test_glass.zip

scene

[priad]

Thanks for your replies,
My light rig isn't so bad IMO I really thing that this come from the mtl itself and I don't speak about the strips but on the glass density itself.

@ Brett: I'll try some variant things to try, I'll keep you posted.
@ Chris: interesting but what a nightmare

If you have other ideas you R welcome

[priad]

@ elcabron: interesting link, I have read and test many light rig, I have also the agtool wich is a great time saver for this, but I really dunno if this help for the density.

[elcabron]

its all about the light, power of light sources, balance key and fill light, angles and Augustin-Jean Fresnel!
here is examples of my rigs for white wines and cosmetics

[priad]

Interesting, I'll give it a shot.
Have you some high end render to show me, to see the level of your glass only if you want to? (PM or here) I'm really interested.
this is for cosmetic and to replace a photo shooting, so the level needed is very high, I would like to catch a "high end ultra photo realistic" render eheheh, I have try it in Maxwell, where the glass is very well managed but i love too much Vray and Chaos .
I'm really sure without any doubt that Vray can do that in a simple way. So I'm searching and asking

[elcabron]

sorry, forget - this rigs are for my second job as photographer - real life examples
but try test scene attached in previous post
if you want real dispersion you don't need Maxwell, you need Photoshop - your image -> duplicate layer - filter->distort->lens correction and add some chromatic aberration some masking
done