how to make foggy glass

[wadecong]

Does anyone know how to make a foggy glass materials, i have tried several times to manipulate the glass material it doesn't work.

 

the appearance should be like the following pic. hope someone can tell me. thx a lot

[Corey Beaulieu]

A decent trick, and it is a cheat mind you, is to use a light material with a box gradient in the diffuse (so the edges are darkened) and an opacity map.

 

Otherwise your dealing with a lower Refraction value with a glossiness of 0.8-ish or lower and low reflection. Fog color and/or bias are not factors here. Those are for glass that needs to show color where it is thicker.

 

I realize this is not great information, but the point is that you are either dealing with something subtle and hard to get ahold of or a trick like alight material. I'd do what you have time for and then do both when you have delivered.

[wadecong]

Thanks for your tips, I have tried normal way as you said to lower down the glossiness of it. It doesn't work so well. Can you give me some illustration of how to do the trick.

Thx

[Nic H]

how have you tried to do it? have a go and replicate what you see?

 

get a 3d person model - backlight the scene with a vray plane light - put a glossy refractive value with almost white refraction on the glass geometry material

 

it should be pretty simple?

[Ismael]

Simple frost glass.

 

[Chris MacDonald]

It's easy. Just set up a normal glass material (Black diffuse, white relfection, white refraction, fog colour if you need it) then change the refractive glossiness to something like .85

[wadecong]

can you give me a screenshot about the material of glass parameter thx

[wadecong]

thx, it works

[wadecong]

 

It works, with the material only has refraction and put the glossiness down to 0.8 without any difficulties to make the appearance of foggy glass.

[alias_marks]

Is it a still image? if you need to animate it I'd keep going with the material settings. If it's only a still, I'd save the headache and render out a simple 32 bit zdepth and play with it in Photoshop until you can get the masks right..

[wadecong]

thx, i am doing it with light in vray works, but within natural sketchup sunlight it seems useless, so i still need work in ps

[Chris MacDonald]

I don't see what it is you're struggling with. Frosted glass is one of the most basic materials, I've never had to do it in post with photoshop.

[wadecong]

this is what i got, outer glass is foggy glass inside is brick wall, and it still appears, and the distance between the two wall is about 5"

[Chris MacDonald]

I can't even see the glass the image is so small, and I'm still not entirely sure what it is you're struggling with? You seemed to have cracked it on the previous page.

[Chris MacDonald]

 

Subtle effect on this image, but all you'd need to do is simply change the refraction glossiness parameter to make the effect more visible.