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Visualize the lightmap atlas.
Parameter(s) <0/1>
Default Parameter 0
r_lm_debug_show <0/1>

Since the number of atlas pages determines how large the lightmap file, .light, ends up being, it can be instructive to check just how full these pages are. E.g. a barely begun new page might be saved by removing some lit brush faces from the map.

A valuable method for lightmap optimizations, see Lightmap Atlas Explained.