Subject:
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Re: L3DView v0.5 view LDraw models in real-time 3D
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 20 Jun 2000 20:48:27 GMT
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Viewed:
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592 times
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Travis Cobbs wrote:
>
> Well, OpenGL actually makes the transparency that I implemented fairly easy
> if you know how. If you want, I'll send you the steps. Getting it to be
> more accurate when multiple transparent pieces overlap the same portion of
> the screen is harder. One advantage that the stippled version has is that
> it avoids this problem (at the expense of only being able to see the
> front-most transparent piece).
I used a BSP to avoid that problem in LeoCAD, works really well.
> Since I am using the OpenGL T&L pipeline, drawing the conditional lines will
> be extremely difficult for my program. OpenGL doesn't exactly encourage
> examination of the transformed coordinates, particularly not in a real-time
> scenario. I also use a display list, and all the conditional lines would
> have to be drawn manually each time outside the display list. I'm first
> going get the standard lines to (optionally) show up before even thinking
> about the conditional lines, though. Once I have them, I should be able
> make lighting optional, which should hopefully speed it up even further.
If you want to have the optional lines then you should transform the
coordinates yourself, using gluProject is not a good idea (glu functions
should be avoided as much as possible).
Leonardo
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