Type of Glass?

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tarikb
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Type of Glass?

Post by tarikb » Sat Feb 05, 2011 3:18 am

Can anyone explane types of glass, and how can someone use all type of glass, because only thine glass doesn't appeare black.

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galinette
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Re: Type of Glass?

Post by galinette » Sat Feb 05, 2011 4:21 am

Hello,

Non-thin glasses are meant to be applied to volumes only.

This means, if you want to make a sheet of glass, for instance in a window, you must model it as a cube (and not as a single polygon) with some thickness (standard glass sheets have 4mm to 10mm thickness). Otherwise, it will appear black.

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Bosseye
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Re: Type of Glass?

Post by Bosseye » Sat Feb 05, 2011 4:52 am

Galinette is correct (as always) - if you want to use any glass other than the 'thin glass' then you need to have a volume, ie draw a box in sketchup and apply the glass material to both sides for it to work. If you apply glass to a single plane in sketchup it comes out black and shiny.

I think thin glass is quicker to render though? But won;t give you quite as realistic results as a proper glass material

See below, on the right is a single pane, renders black - on the left a volume (box) renders like glass.

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Zom-B
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Re: Type of Glass?

Post by Zom-B » Sun Feb 06, 2011 2:30 am

Bosseye wrote:If you apply glass to a single plane in sketchup it comes out black and shiny
only because you render it from behind /normals facing inside). from the other side you have a different result ;)
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Pibuz
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Re: Type of Glass?

Post by Pibuz » Mon Feb 07, 2011 5:47 am

BY THE WAY, you get an incorrect result if you apply a specular shader to planar geometry.

Some time ago I had a very interesting discussion with Thomas (aka Lycium): he told me to try and use only the specular shader, instead of the Thing Glass. He strongly supports the correspondence between reality and modeling, because this points the rendering engine's development unidirectionally towards realistic algorithms and less to biased shortcuts, so the result can be more real-like. A good exemple can be the new "architectural glass" algorithm.

To make a long story short, always model volumes, because glass can be only tridimensional. 8)

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Bosseye
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Re: Type of Glass?

Post by Bosseye » Mon Feb 07, 2011 9:38 pm

Zom-B wrote:
Bosseye wrote:If you apply glass to a single plane in sketchup it comes out black and shiny
only because you render it from behind /normals facing inside). from the other side you have a different result ;)
Not me squire! See below, the glass preset comes out black and shiny even if applied to the correct face on a single plane.

The red arrow is just for orientation so you can see I've rotated the view to show the back face (pure black as you know) The other box obviously shows the glass preset applied to a volume where it works correctly.

Image

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tarikb
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Re: Type of Glass?

Post by tarikb » Tue Feb 08, 2011 9:05 am

Thank you all, very much. You have helped me a lot.
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Pibuz
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Re: Type of Glass?

Post by Pibuz » Tue Feb 08, 2011 6:35 pm

Interested stained glass and grass. Maybe a little too much DOF, and underexposition.. Could you make a lighter version? :mrgreen:

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tarikb
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Re: Type of Glass?

Post by tarikb » Sat Feb 12, 2011 12:16 am

can you explain me what do you mean by DOF and expo... Jes i can make brighter version :) Thanks
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Pibuz
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Re: Type of Glass?

Post by Pibuz » Sat Feb 12, 2011 1:23 am

DOF = Depth Of Field, which basically means the distance put on focus. Higher number (e.g. f/22) results in clearer objects (I'm simplifying A LOT), low numbers (e.g. f/2) result in more out- of-focus objects.

Increase the ISO value to adjust the exposure: higher numbers mean lighter image.

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tarikb
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Re: Type of Glass?

Post by tarikb » Tue Feb 15, 2011 8:16 am

THANKS
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