Subject:
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Re: Large LDraw/MPD Files?
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Newsgroups:
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lugnet.cad
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Date:
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Fri, 20 Dec 2002 20:05:10 GMT
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Viewed:
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599 times
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In lugnet.cad, Travis Cobbs writes:
> I tried loading datville just to see how much memory would get used. When I
> came back the next morning to see a crash, I came to the conclusion that it
> had reached the 2GB virtual memory limit of Win 98 (assuming 2GB really is
> the max you can use in Win98). (My swap drive had probably 15GB available,
> so it shouldn't have been limited by that.)
>
> This is clearly way too much. On the other hand, unlike ldglite, LDView
> actually makes a copy of all the geometry in an attempt to speed up
> rendering. So, each unique part in a model is loaded once for the part
> cache, and one additional time for each time it is used in the model. (I
> need to do some tests to see how much this helps performance, if any).
> While I doubt it, it is possible that all the geometry in datville when
> treated as completely unrelated triangles does indeed add up to more than 2GB.
I'm not sure what you mean by this. Ldglite only creates one structure
in memory per part file. It's quite frugal with the memory when you
use the L3 Parser. Thanks, Lars. I think I've displayed datsville in
ldglite on a PC with as little as 64MB, perhaps less.
I suspect the problem with LDView is the large display lists. The first
test I'd do is try rendering without them to see how much memory that
takes. Display lists use more memory than a C structure, and I don't
think you want them to grow too large. Making them larger than the
amount of video memory is probably really bad. You might be better off
with a separate display list for each line in the main model file, or
abanoning them altogether when they exceed a certain number of triangles.
Don
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Message has 1 Reply:
 | | Re: Large LDraw/MPD Files?
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| (...) I meant basically what you just said. Ldglite doesn't create a new copy of the part each time it is used; LDView does. I do this for various reasons, but I believe that when I go back and revisit those reasons now with the advantage of (...) (22 years ago, 21-Dec-02, to lugnet.cad, lugnet.cad.dev)
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Message is in Reply To:
| | Re: Large LDraw/MPD Files?
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| (...) One of the first things I will probably try to do with LDView after I finally get 2.0 out the door is to work on its memory consumption. But first I have to figure out where all the memory is getting used. Doing some quick calculations based (...) (22 years ago, 20-Dec-02, to lugnet.cad)
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