In this tutorial I'll show you how to properly build cubemaps using BSPEntSpy instead of PakRat.

Commands used (in order):
mat_specular 0
map your map name
sv_cheats 1
buildcubemaps
disconnect
mat_specular 1
quit

More on that here: https://developer.valvesoftware.com/w...
BSPEntSpy: https://github.com/jakgor471/BSPEntSp...