Func_detail is useful brush entity, similar to func_wall except it doesn't support Render Modes. Detailed brushes like tables, signs computers, pipes, cars e.t.c. should be turned into func_detail instead of func_wall. Brushes tied into func_detail are Detail Brushes. Detail brushes don't block vis, nor slowing vis processing down. It won't chop other brushes, helps to avoid many compiling warnings. The one of most important feature of func_detail is that detail brushes won't count into models limit (just like func_walls) which is very easy to exceed in Sven Co-op. You can customize detail level (description below), and passability of func_brush (it's better than func_illusionary because of better lightning receiving and in-game decals support). Using this brush in replace of func_wall is highly recommended. Every keyvalue are optional, it's recommended to leave them as they are (with an except of 'Passable' key) for beginner mappers. 
Detailed brushes with different detail level won't chop each other. Use higher amount for smaller details. Try to avoid too "Lower it's level to chop others", zhlt_chopdown:If you set this value to no less than a detail level, this brush can chop world brushes (if 'detail level' minus 'lower it's level"Raise it's level to get chopped", zhlt_chopup:
"Detail level of cliphull", zhlt_clipnodedetaillevel:Should always be '0' or '1' unless you are grappling with cliphull errors."Passable", zhlt_noclip: Specify whenever func_detail can be walked through ('Yes') or have full collision ('No'). Note that bullets will still hit this entity when it's passable.
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