Subject:
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Re: New LDConfig.ldr color file
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Wed, 12 Aug 2009 23:17:38 GMT
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Viewed:
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16847 times
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In lugnet.cad.dev.org.ldraw, Eric Albrecht wrote:
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In lugnet.cad.dev.org.ldraw, Travis Cobbs wrote:
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I have a few comments here. First of all, if you’re going to load a huge
model in LDView, it’s usually best to set its “Memory Usage” setting to Low
(especially on old hardware). Secondly, as has been pointed out, LDView
takes a lot longer to load models than L3P, but after they are loaded, they
can be examined at much higher speed (although not once they cause LDView to
have to swap).
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This makes me curious as to how this Memory Usage feature works. Why would I
set the memory usage to “Low” if I have plenty of RAM? What does this do for
me?
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The main effect that this setting has is its control over the amount of display
list compilation used. Display lists are a feature in OpenGL (the graphics
library used by LDView) for drawing static objects. They convert (compile) the
data into an internal format that the graphics card is more efficient at
rendering. My understanding is that this compiled data is also usually stored
directly in video memory.
I can’t remember with absolute certainty, but I believe that Low produces no
display lists, Medium produces a display list for each part, but not for
anything above the part level, and High produces a display list for every part,
plus every sub-model in the model, plus the main model.
As it turns out, display lists use a lot of memory, both PC main memory and
graphics card video memory. So it might be useful to set to Medium or Low even
if you have plenty of system memory, because if they don’t all fit into the
video memory, things slow down.
--Travis
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Message has 1 Reply:
 | | Re: New LDConfig.ldr color file
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| (...) Thanks for the explanation. Since my computer at work (which I am using) is a high end CAD workstation with enough VRAM to display a billion polygons, I guess I should just leave it on HIGH! On my home machine, I will probably slow it down. (...) (15 years ago, 13-Aug-09, to lugnet.cad.dev.org.ldraw, FTX)
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