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LGEO is a library of LEGO parts modeled by POV-Ray primitives.
When exporting LDraw parts to POV-Ray format, tools like LDView can use an XML file,
LGEO.xml, to substitute dedicated parts by their LGEO implementations. The older tool L3P uses the two files
lg_colors.lst to accomplish much the same thing, as well as to indicate whether to switch over to using Anton Raves' POV-Ray parts instead.
Starting from the original library by Lutz Uhlmann, many people edited and added parts to it. This sadly has led to a tree of variations, not a single collection. This tree is shown here:
LGEO by Lutz Uhlmann (dead link*)
┃ ┣━Copy 1 (dead link*)
┃ ┣━archive.org version of Copy 1 (as of 2012-03-20)
┃ ┗━Copy 2
┃ ┗━GitHub repository
┣━━━ LGEO update by Owen Burgoyne (already included with AIOI, no need to download again)
┣━━━ LGEO update by Lars C. Hassing (possibly outdated†, maybe avoid downloading)
┣━━━ LGEO update by Damien Roux
┗━━━ Does anybody know more variants? Please add them here.
* = Lutz's site seems to be offline.
† = Lars's "updated" parts seem to be actually older than the ones included with the AIOI. It may be that you shouldn't use them.