[johnk]

Прочти хэлп.Там все доступно описано.
Вот команды для Браша:
CreateBrush ( [red#][,green#][,blue#] )
LoadBrush ( texture_file$[,flags][,u_scale][,v_scale]
FreeBrush brush
BrushColor brush,red#,green#,blue#
BrushAlpha brush,alpha#
BrushShininess brush,shininess#
BrushTexture brush,texture[,frame][,index]
BrushBlend brush,blend
BrushFX brush,fx
GetEntityBrush(entity)
GetSurfaceBrush(surface)