Frosted Glass

[derwolpertinger]

i'd use sla channel shaders. pretty much the same like the normal glass settings mentioned some threads before. just change the bump and some settings like transparency to achieve a frosted glass look. or place another layer with an alpha map over the normal glass material that has transparency and some bubbles bump map. hope that helped. :)

[neilyb]

Yep, just a normal glass with some noise in the bump channel. Normal 2d noise, nothing fancy. Change scale and amount to suit your needs.

[say-g]

thanks guys, helped abit but still cant get the look i want

im using this image as a reference to my scene (am i breaking any copyright laws :surprised ?) http://www.art.com/asp/sp-asp/_/NV--1_1854_1897/PD--10057894/SZ--3/posters.htm

and heres mine so far

[neilyb]

It's gonna help you alot to have some antialaising and some lights with shadows....otherwise your not going to see the effect of your shaders properly.

[say-g]

the aa is fine, to me atleast, those jaggys on the flask are from the bump channel... the light had a shadow but the shadow from the flask was like a blind, with lines thru it

[neilyb]

Well, we are going to need a larger picture (close up maybe) of the area in question so we can see what you are trying to achieve.

[say-g]

yep. but i have no webspace. and theres this 50k restriction thing here

[Per-Anders]

crop down the image to only the bit we need to see... then save for web from photoshop... you should be able to get a pretty big image from 50k using a decent jpeg setting.

[say-g]

will get on it tomorow, too tired atm. sleep time

[say-g]

i just cant seem to lose the 'milky' ness of it. or add the super small zillions of bubbles that gives it its look...

[Per-Anders]

increase the luminance (of your material).. and have a little white colour there too

[derwolpertinger]

did you maybe enable the additive option in the transparency channel? if so try to uncheck that button.

[Per-Anders]

you need to keep additive on. simply add some luminance, and a little bit of grey colour (luminance we're talking here is like 5% or something) here's a sample. oh and the image you've got doesnt show any refraction as far as i can see... so it's just a grey transparent material with a bit of specular highlight

[derwolpertinger]

additive on? but only for frosted glass then? cause i didn't use it for my "normal" cocktail glass.

[say-g]

oh and the image you've got doesnt show any refraction as far as i can see... so it's just a grey transparent material with a bit of specular highlight

eh? it has a freaction index of 1.4

[Per-Anders]

really? the original one that you're working from? it looks to me like it's done without raytracing, just flat grey gourad with a simple bump map and some specular... but i could be wrong, didn't take that long and hard a close look at it.

anyhow what i suggest will work. the tiny bubbles effect is the brain reading more into the image than is there because of the colour.. same as matte painting.

[say-g]

im confused, r u refering to the reference pic im using from art.com or the very 1st pic i posted ?

anyway here is an update (i seemed to have a better version but then i tweaked somethings and forgot wat i had b4 :wip: )
i think the luminence (set on 3%) is making that yucky bright patch at the bottom

[Burlap_Sack]

I remember dispersion working well for this.
but no ones metioned it, seems obvious to me.
is there a reason why not?:shrug:

and maybe fresnel in the lumanance...

[neilyb]

Dispersion? Not heard of that.

Erm, I'm having a play with chanlum in the bump channel as it gives a very fine frosted bump. Does take a long time to render however!

The problem with the reference picture that you are using is that it is not CG, but painted....so the effect is gonna be difficult to achieve.

[say-g]

displacement you mean maybe burlap sack ?

ill have a try with chanlum, also while looking at some of the frosted lighting fixtures around the house i noticed they look abit more like plastic than glass, so i might try starting from a plastic/jellybean type material.

but if all else fails ill i spose ill have to go with what looks good to the eye

[Burlap_Sack]

sorry, What I meant was blur.

it'll give you something more like this.

its a little transparent for what your going for but you get the picture.

[say-g]

how do u add blur ?

[dirtySanchez]

Hi, have you tried Banji? Its pretty much custom made for what you want to do. To get a 'stronger' frosted effect, try adjusting the front/back opacity settings under the banji transparency tab. The optical distortion caused by the frosting can be adjusted by altering the scale on the roughness tab.
Files attached. hope this helps.

DS

[dirtySanchez]

Heres the C4D file if you need it...

[say-g]

thanks dirty sanchez, i tried banji, didnt play around with it enuf and thought to myself i should try plain old materials 1st, the whole scene was a texturing exercise for me, the copper was made with fusion and some other channel shaders

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