Alien Swarm Mapper's Reference

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A quick reference for the numbers and statistics that any Alien Swarm level designer should know. Most importantly, use these numbers to help make a map feel in proportion.

Map Grid Units: quick reference

Map Grid    Imperial    Metric

     1  =   0.75"   =   0.01905 
     2  =   1.5"    =   0.04
     4  =   3"      =   0.08
     8  =   6"      =   0.15 
    16  =   1'      =   0.3 
    32  =   2'      =   0.6
    64  =   4'      =   1.2 
   128  =   8'      =   2.4
  (160  =  10'      =   3.0)
   256  =  16'      =   4.9
   512  =  32'      =   9.8

Other info

• Horizontal player clearance: 29
• Vertical player clearance: 73
• Maximum height of walkable stair: 24