when you start q3map2build, you will need to specify paths and such,
and you get 3 compile stages, one for a bsp, the 2nd to 'vis' the map
( vis means it will create portals and sort them into a tree for quick indexing
to display only whats in the pvs )
and finally the light compile.
bsp - set on Custom, and in its options set enable meta
vis - just leave that as normal, no options
light - set on Custom, and in its options set Export ( all lightmaps for et are saved in an external folder )
-fast option and finally -lightmapsize option set to... oh, 128. that last option
just specifiys the size of the lightmap images to create, 128x128.
after all that, you can click on Build, then wait for it to finish.
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