Stained glass
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Try setting the refraction "color" option instead of fog. I believe fog does have to do with volume, which may be why the small pieces don't cast color.
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That worked! Now, is this a 'cheat'? I've learned in the past that you want to use fog for colored glass. I have never used the color setting in this fashion to achieve colored glass.
@andybot said:
Try setting the refraction "color" option instead of fog. I believe fog does have to do with volume, which may be why the small pieces don't cast color.
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Not sure I understand it all myself. I would guess that different properties are affected. The "color" option affects light coming through, and fog affects the appearance.
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The Fog Color slot is intended to color refracting surfaces at a gradient from the thickest areas receiving a darkest fog color and thinner areas receiving a lighter fog color. It works best within curved glass surfaces such as bottles, wine glasses etc. Since a flat plane window has no varying thickness the fog will not color the glass. In that case the refraction color is the only option that will tint the glass properly.
You can test it by trying the same material out on curved surface.
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Thanks - that's helpful to know. I actually saw the gradient effect when I tried to use fog on car glass, now it makes sense why it's supposed to be like that. (so fog color is a "cheat" already
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Well I believe the Fog slot was meant to represent the phenomena of seeing thick glass on edge, the iron in the glass absorbs the infra-red and ultra-violet making it look green. http://uk.answers.yahoo.com/question/index?qid=20080308120406AAfKk3m so its not really a cheat per se.
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This is all great information. Thanks guys. I will post the render when I wrap up a good draft.
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So I did not want to give up on the fog issue yet because this is how Fernando has always said you color glass. I made a series of glass boxes using a blue fog color. The front row starts at 1' thick on the left and works its way down to 2" thick. The panes in the back are 1/2" thick and half in size as they move left.
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Here is the test render. This uses color set in the refraction because fog would not work at all.
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Wrapped up the rendering
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More tonal adjustments in Photoshop. This is the final image.
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