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, 10 Oct 2007 16:32:17 GMT
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Viewed:
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3029 times
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In lugnet.cad, Don Heyse wrote:
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In lugnet.cad, Travis Cobbs wrote:
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In lugnet.cad, Travis Cobbs wrote:
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But I was wondering about the first set of images. Did you get this
with only the 3 pass method you described, or did you also have some
form of FSAA enabled? If you got it without FSAA, that’s really
impressive.
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The image on the above page was rendered with antialiased lines, but no FSAA.
FSAA would have brought the halo back, since there’s no way to have FSAA on part
of the scene, but not on other parts. In theory I could render the image twice,
once with FSAA, and once without. I could then use the FSAA version for all
fully opaque pixels and the non-FSAA version for all partially opaque pixels.
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I was also wondering if FSAA does anything to the stippled transparency.
I don’t have the hardware so I can’t try it, but I’m sorta partial to
the way the cheesy stippled transparency comes out when you antialias it.
At least for instructions, I think it’s a bit less confusing.
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On my ATI card at work, the stipple pattern doesn’t get antialiased. Of course,
if the stippling is implement via some sort of alpha texture tricks, this would
make sense. (Just do a Google search for MSAA alpha textures.) My ATI card
doesn’t support “transparency antialiasing”, which is a feature on newer cards
to antialias alpha textures. I don’t think my nVidia card at home supports
transparency antialiasing either, but nVidia might not use texture tricks for
their stipple support. And even if they do, LDView goes up to 16x FSAA there,
and as far as I know 16x FSAA isn’t fully MSAA. (Oddly enough, nVidia’s
marketing department claims that my card maxes out at 8x FSAA, and yet the card
happily allows 16x FSAA in OpenGL.)
In any event, you could get the same effect with blended transparency by drawing
transparent polygons from front to back with depth testing enabled. The polygon
sort algorithm might have to be more accurate than mine to avoid artifacts,
though.
--Travis
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Message has 1 Reply:
 | | Re: White noise around model with colored background
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| (...) Wow, those lines are much smoother than anything I remember getting with simple antialiased lines. Was that rendered by ATI or Nvidia, or do they both give you results like that? Does the SMOOTH HINT make a big difference? I think I set it to (...) (17 years ago, 10-Oct-07, to lugnet.cad, FTX)
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Message is in Reply To:
| | Re: White noise around model with colored background
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| (...) Hey those look nice. Just for kicks I ran off a test with the ancient method of ldglite at 2x scale followed by ImageMagick mogrify 50% to shrink it back and antialias. (URL) I like your edge outer edges better. Very nice. I'll have to look (...) (17 years ago, 10-Oct-07, to lugnet.cad, FTX)
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