the specific console command you're after is picmip, it ranges from 1-15 with 15 being the lowest detail.
the reason i use the lowest possible picmip is because i find it a lot easier to aim because the map textures don't overpower the crosshairs and the enemy model stands out more.
on the downside though, it looks very very bad
just bring down the console and go /r_picmip xx then do a /vid_restart
Posted on Monday, 7th March 2011