Subject:
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Re: "Illusions"
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Newsgroups:
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lugnet.cad.ray
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Date:
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Wed, 3 Mar 2004 13:51:20 GMT
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Viewed:
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1953 times
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Couple of things:
1. Where I said
“By setting the transparency and transmit values high”,
I meant
“By setting the transparency and *filter* values high”,
2. Let me once again point out that CGI and real objects might look the same,
but often act differently.
Case in point: if you place a colored tranparent plastic sheet in front of a
real light, the light will acquire the tint of the plactic sheet.
But in CGI, and specifically, in POVray, that is not the case.
To define a CGI plastic sheet, once you’ve defined a shape, you need to a
material, which will likely include color and a transparency value.
... but if you hold it in front of a light, the shadow will remain
gray/black-ish. The transparency setting MIGHT allow light through, but it will
not tint it. To tint the light so that it casts a colored shadow after passing
thorugh a colored transparent object, you need to add a *filter* setting to the
material definition of the object.
If you think this is quite convoluted, you might also find interesting to know
that other rendering systems (specially non-ray-tracing ones) are not able to
even simulate the tinted light effect AT ALL.
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Message is in Reply To:
 | | Re: "Illusions"
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| (...) Looking at your file made me notice something that tells me definitely that you and David are correct. I never noticed before that there is a filter value in there after the rgb vector. Naturally that would skew things a bit. So David was (...) (21 years ago, 3-Mar-04, to lugnet.cad.ray, FTX)
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