Translucent frosted glass

List of materials and their settings plus screen shots
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steveww
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Translucent frosted glass

Post by steveww » Tue Apr 08, 2014 1:21 pm

I m new to raylectron

I am trying to create an interior rendering of a space that is lit by sunlight shining through a translucent material like frosted glass. Light comes through but you can't see out. I want soft diffuse sunlight. Even at 1% transparency I get a crisp light with sharp edges and see clearly through the surface to the outside.

Any suggestions?

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Re: Translucent frosted glass

Post by Support » Tue Apr 08, 2014 2:18 pm

Since you want soft diffuse lighting, do not select "Direct illumination" to prevent the Sun from penetrating your window directly, and set your glass roughness to 20 or so which will give you a nice frosted glass style.
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Dknight
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Re: Translucent frosted glass

Post by Dknight » Thu Apr 10, 2014 11:07 am

well that would work when you have just translucent materials... what do you do when you have a translucent panel next to a window?

steveww
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Re: Translucent frosted glass

Post by steveww » Thu Apr 10, 2014 11:52 am

That's my question too, thanks to Dknight for asking it first.

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Re: Translucent frosted glass

Post by Support » Thu Apr 10, 2014 12:44 pm

Do you guys have a picture of the effect this should produce?
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steveww
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Re: Translucent frosted glass

Post by steveww » Thu Apr 10, 2014 12:55 pm

something like this, where a space has both frosted and clear sources of daylight

http://construction.com/CE/CE_images/20 ... ulti_5.jpg

the particular space I am trying to model has large frosted skylights and clear windows in one art gallery-like space

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Re: Translucent frosted glass

Post by Support » Thu Apr 10, 2014 1:26 pm

I see what you mean. After doing a test with a real frosted glass, at the sun, It looks the same as the screen shot below taken from Raylectron v4 (pre-release). Is this the effect you are looking for?
Untitled.png
Untitled.png (421.84 KiB) Viewed 20711 times
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steveww
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Re: Translucent frosted glass

Post by steveww » Thu Apr 10, 2014 1:35 pm

yes, that looks pretty close.

light coming through frosted glass should be much brighter, can this be adjusted?
is this effect possible only with v4, which isn't available yet?
Was this done using direct illumination?

FYI, this is very easy to do using kerkithea. You just assign the translucent material and run the program.

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Re: Translucent frosted glass

Post by Dknight » Thu Apr 10, 2014 1:42 pm

it looks like the transparency was turned way down (30%?), and the roughness was turned way up (50%?).

I don't believe you would see a hard shadow on the ground as is on the image above, instead it would illuminate the area around the window. as if it was a light.

actually... perhaps that is the solution. can you make it be a light emitting object AND have some transparency?

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Re: Translucent frosted glass

Post by Support » Thu Apr 10, 2014 2:03 pm

There is more to it than just assigning a translucent material and run the program. There are many things to take into consideration, and if it uses DI or not. Photontrace will do it right, but it's very slow.

Yes, you can make the window an emitter and make it 100% transparent. But we're not into doing hacks, but rather, make it work the way it should.

In v4 using DI, it does take into consideration the Diffuse (roughness in v3) setting. In real life, a frosted glass close to the floor, like a foot, it act as a clear glass, the sun shine right through it. The further it is from the floor, the more diffused the sun light is. That's what we're trying to make v4 do right at this minute. I'll post more screen shot in a bit...

Do you guys have real good video card? I mean real good ones? if so, I can let you test v4.
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Re: Translucent frosted glass

Post by Support » Thu Apr 10, 2014 2:44 pm

After doing more tests at the sun with real frosted glass of different frosted density, v4 appear to do it correctly now.
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