Subject:
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Antialiasing lines and printed polygons
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 9 Jul 2002 15:40:28 GMT
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Viewed:
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2134 times
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In lugnet.cad.dev, Don Heyse writes:
> In lugnet.cad, Travis Cobbs writes:
> > I think I'll add antialiased lines to my list of future features. I already
> > draw the lines last, so that's not a problem.
>
> You should definitely do it! I think it's less than 10 lines of code to
> antialias them and they look much, much better. The hard part for me in
> ldglite was breaking it into multiple passes. The antialiasing was easy.
> Just try this before you draw the lines.
>
> glEnable( GL_LINE_SMOOTH );
> glHint( GL_LINE_SMOOTH_HINT, GL_NICEST ); // GL_FASTEST GL_DONT_CARE
> glEnable( GL_BLEND );
> glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
>
> On my ancient hardware I don't notice any speed difference. And from
> what I read about lines in openGL, they're already slow on a lot of
> the hardware accelerators, so this may not slow it down there either.
>
> The only other thing I do to make it look good is draw the line endpoints
> with glPointSize() when glLineWidth is set wider than a pixel. I do this
> before the drawing the lines, and don't bother with GL_POINT_SMOOTH.
> This way the lines blend into the endpoints and you don't get those ugly
> rectangular line ends.
Another nifty thing to do is to draw the printed polygons (type 3 and 4
lines in ldraw that don't use color 16) a second time in GL_LINE mode and
antialias them along with the type 2 and type 5 edge lines. This gives
you a nice cheap fullscreen antialiased look for the printed parts.
Check out the difference. Before:
http://ldglite.sourceforge.net/torso.png
After:
http://ldglite.sourceforge.net/torsoa.png
Don
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Message is in Reply To:
 | | Re: *** LDView Version 1.9.5 Released ***
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| (...) Classses? Objects? Destructors? Instances? Don't worry, I won't be borrowing much of that. So far ldglite is just plain C code and I'm not planning on spoiling it with any of that nasty OOP stuff at this point. ;^) I was just thinking about (...) (24 years ago, 30-May-02, to lugnet.cad.dev)
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