Subject:
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Re: Some secrets of MLCad revealed ...
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Newsgroups:
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lugnet.cad.mlcad
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Date:
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Wed, 9 Jul 2003 16:25:37 GMT
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Viewed:
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3954 times
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Hi Don,
"Don Heyse" schrieb im Newsbeitrag news:HHrE7q.1vCq@lugnet.com...
> I'm a bit behind on this thread, but thanks Michael. That explains
> a lot. I never thought of the image buffering approach for orthographic
> displays. It's a really neat idea! I do have a question though. How
> do you handle colors in the image buffers? I guess the image buffers
> don't go with the cached parts, but with a colored instance of the part?
> Or do you add the color when you adjust to the final Z values?
>
> I can imagine using precalculated images would do wonders for rendering
> all the studs in an orthographic projection. Have you thought about
> using Lars' bounding box occlusion test for eliminating needless stud
> drawing in pespective renderings?
>
> Thanks,
>
> Don
The image buffers, just keep the light information in it, but not the color
itself, the color is assigned
during pasting the image onto the screen.
I think I haven't used Lars bounding box test yet, but I've tried several
others, which lead to a
result that the rendering time was nearly the same with or without the
tests.
I've done some optimisations and speedup on the rendering code (nothing
special just using c/c++ programming tricks), and
it's seems it's realy fast so that such smaller optimisations to not count.
Will see maybe the rendering stuff is in assembler some day ...
Michael
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Message has 1 Reply:
 | | Re: Some secrets of MLCad revealed ...
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| (...) Yes, that makes sense. Hey, I did a little searching and found some references to "depth sprites" which seem to be supported in some of the latest graphics hardware. I haven't read it yet, but the pictures in this article seem to indicate that (...) (21 years ago, 9-Jul-03, to lugnet.cad.mlcad, lugnet.cad.dev)
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Message is in Reply To:
| | Re: Some secrets of MLCad revealed ...
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| (...) I'm a bit behind on this thread, but thanks Michael. That explains a lot. I never thought of the image buffering approach for orthographic displays. It's a really neat idea! I do have a question though. How do you handle colors in the image (...) (21 years ago, 9-Jul-03, to lugnet.cad.mlcad)
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