Subject:
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Re: Need (working) program to generate instruction pictures
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Newsgroups:
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lugnet.cad.dev.mac
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Date:
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Sun, 4 Mar 2007 20:18:07 GMT
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Viewed:
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4729 times
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In lugnet.cad.dev.mac, Jim DeVona wrote:
> In lugnet.cad.dev.mac, Christopher Masi wrote:
> OK. I've set up a proper .MacOSX/environment.plist now, but I can't see that
> it's made any difference. The [mis]behavior is the same. This and the video
> information your provided supports my gut feeling that the problem is limited to
> the display mechanism rather than any of the underlying LDraw stuff.
>
> > The the faster 17" and 20" iMacs use an ATi Radeon X1600 graphics
> > processor, and the 24" iMac uses a NVIDIA GeForce 7300 GT graphics
> > processor. The MacBook Pros use an ATI Mobility Radeon X1600 graphics
> > processor. I suspect that is why I don't have any display artifacts and
> > you do.
>
> Ah, I didn't realize your machine is a MacBook Pro. I thought it was a plain
> MacBook, like mine. Indeed there are considerable video differences between
> these models that may explain the different experiences we've had. I think
> that's useful to know.
I haven't followed all of this, but I suspect this is probably a driver
issue. Ldglite is getting pretty old. It's so old that when I wrote the
opengl bits the hardware (and software opengl) of the time was typically unable
to render the model fast enough to make double buffering practical.
So I chose to render in the front buffer. That way you could at least see
something as the model was drawn. Nowadays the hardware is much faster,
so everyone expects things to be rendered in double buffer mode, which
is reasonable. Except the driver writers don't seem to even bother to test
front buffer rendering. So it no longer works on many hardware opengl
implementions. ATI drivers are especially bad, and not just on Macs.
You can try to force double buffering in ldglite with the -n2 or -n4
command line switches, but this may interact badly with some of the
other unusual obsolete old-school performance tricks I used (especially in
ledit mode).
Sorry about that. I suppose I could build an offscreen only version of
ldglite for the Mac using only the osmesa software opengl implementation.
I think this is still in use by peeron and ldraw.org to render parts. It
could also be used to render STEP image files without requiring any opengl
drivers or hardware. Would that be useful?
Don
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