Subject:
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Re: Opinions sought on rendering method
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Newsgroups:
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lugnet.cad.ray
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Date:
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Tue, 9 Oct 2007 08:23:36 GMT
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Viewed:
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8712 times
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In lugnet.cad.ray, Travis Cobbs wrote:
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In lugnet.cad.ray, Jim DeVona wrote:
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Would it make sense for part transparency to influence the output alpha
channel? In your example, the mask is uniform over the whole model,
including parts of the windshield which you would hypothetically be able to
see through.
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Actually, if you look you will see that parts of it are somewhat transparent
(like the left edge of the windscreen). All of it that has the background
visible through transparent parts is supposed to be somewhat transparent, but
it looks like my routine that does that is broken. However, even if that
worked, there would be two problems. The first is that I try to make that
part partially transparent in the PNG file, but I make all of it the same
level of transparency, no matter how many transparent layers it went through
first. That’s obviously not right.
The second is that the background color (white in the example) in LDView
still gets blended with the color of the parts that are supposed to allow the
background to show through. It may be that with an extra alpha pass I can
fix that and get things to render “right”. I’ll play around with it some
more.
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OK, I played around with this tonight for a few hours, and finally came up with
something that I think I’m happy with. It requires 3 passes of the transparent
polygons (just during snapshot save with SaveAlpha enabled), but it seems to get
reasonable transparency info into the alpha channel of the file, and it doesn’t
blend transparent parts into LDView’s selected background color.
Below are two different resolution samples of the same rendering. Please put
various backgrounds behind it and let me know what you think.
1600x1200
800x600
--Travis
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Opinions sought on rendering method
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| (...) It'll be there in the next release. (...) Actually, if you look you will see that parts of it are somewhat transparent (like the left edge of the windscreen). All of it that has the background visible through transparent parts is supposed to (...) (17 years ago, 9-Oct-07, to lugnet.cad.ray, FTX)
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