Subject:
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Re: Line Thickness and Antialiasing in LdGLite 0.7.3
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Newsgroups:
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lugnet.cad, lugnet.cad.dev
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Date:
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Wed, 3 Jan 2001 16:36:45 GMT
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Viewed:
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668 times
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In lugnet.cad.dev, Steve Bliss writes:
> Very cool! I noticed two things, which could be considered problems. One
> is straight-forward, the other is not so.
>
> The first thing is that using the -ms commandline option doesn't save any
> images if there are no 0 STEP commands in the file. I was testing with a
> part file, not a model. I assume that if a DAT contained drawing commands
> after the last 0 STEP, those final drawing commands wouldn't be saved to an
> image, either.
>
> Using antialiasing with the line-width (-q and -w2), it seemed like the
> rendered lines were slightly offset from the surfaces. I haven't done
> extensive testing on this issue, I'll post more when I do.
Yes, more details would help. For instance, which direction is the offset:
Forward, Up, Down, left, right? I'll have to try it out myself some more.
If I remember correctly, I think I may have gotten better results with
non-whole number widths. This may all be driver dependent though.
> Now, is there a way to do a rendering that creates an image file, without
> rendering on the screen?
Not really, but it is on my short list for the next release. I just found
a tile based rendering library for opengl that seems to do exactly that.
And it looks like it's portable. If you had to, you could do it now with
the loopback X window server, but I think we already went over that idea
a while ago.
Don
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