Hello! Forever ago I was taught that: 1) I should try to build my brushes so only the edges are aligned rather than laying flush against each other. 2) Always, always use noDraw for areas the players do not see. I've noticed in some newer Valve maps there doesn't seem to be as much importance placed on this. Particularly in Portal 2 maps. Can anybody tell me if these two practices are still important or if they are hold overs from older engine versions? Thank you!