Subject:
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Re: White noise around model with colored background
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 8 Jun 2005 22:01:01 GMT
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Viewed:
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1178 times
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In lugnet.cad, Travis Cobbs wrote:
> In lugnet.cad, Jaco van der Molen wrote:
> > Is there a way, using LPub and LDGLite as a renderer, to get rid
> > of the white "noise" around the model when using a colored background?
> > See example:
> > http://www.brickshelf.com/gallery/sjaacko/Temp/LPubTests/bbsswinr_0_05_ci.png
>
> You need to either set the background color in LDGLite to be the same
> color as your background color in the LPub images, or turn off
> antialiasing in LDGLite. I'm not sure how to do either, but I assume
> both are possible.
Antialiasing it turned on in ldglite by -q. I'm not sure if this
is done automatically by lpub or if it's in the optional settings box.
Background color is set by -b and I think it supports ldlite and
l3p colors style extended colors.
> One problem with setting the background color in LDGLite is that the
> PLIs in LPub use a different color background from the model. I don't
> think there's any way to get LPub to generate these things with
> different settings passed into LDGLite.
>
> Kevin, it would be cool if you automatically passed command line
> arguments to LDGLite and LDView to set their background color to
> the color chosen in LPub. That way the antialiasing would blend
> in automatically. When you generate the parts images, you'd set
> the background color based on the PLI background, and when you
> generated the instructions images, you'd use the layout background
> color.
>
> For the record, you get the same kind of problem in LDView if you have
> tranparent parts in the model, and the background is visible through the
> transparent parts. The transparent parts get shaded based on LDView's
> background color.
>
> Unfortunately, even though LDGLite and LDView are spitting out
> fully transparent backgrounds, I don't think it's possible (in OpenGL)
> to get the antialiased outline to not have color bleed from the
> background.
I think I had an idea for an extra rendering pass to fix this but
never got motivated enough to try it out.
http://news.lugnet.com/cad/dev/?n=9910
Does it sound like it might work? I can barely remember what I was
thinking.
Don
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Message has 1 Reply:
 | | Re: White noise around model with colored background
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| (...) That won't help. The problem is that OpenGL antialiasing antialises the color channel based on the background color the original rendering happens over. So even if you bump the alpha on all those pixels up to 1.0 (fully opaque), you'll still (...) (19 years ago, 8-Jun-05, to lugnet.cad)
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Message is in Reply To:
| | Re: White noise around model with colored background
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| (...) your background color in the LPub images, or turn off antialiasing in LDGLite. I'm not sure how to do either, but I assume both are possible. One problem with setting the background color in LDGLite is that the PLIs in LPub use a different (...) (19 years ago, 8-Jun-05, to lugnet.cad)
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