Dimensions in the Left 4 Dead Series
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Note:Player's collision box is axis aligned meaning to fit a corridor which is at 45 degree angle you need at least 46 units for player to fit (diagonal width of player is ~45.25 units)
Note:
Left 4 Dead 2 makes no difference between default jump and the "crouch jump" which usually gives you a higher jump height, because Valve decided to make the default jump height the crouch jump height.
The following numbers are the known dimensions for the Left 4 Dead series. Any missing dimensions can be found here.
Todo: it appears at least some of this applies to 
, but possibly not all of it. how much?
, but possibly not all of it. how much?Dimensions
Player Specific
Player Height Standing = 71 units (the gap for them to fit must be bigger safe to go with 72 units) Player Height Crouching = 56 units Player Width: = 32 units (the gap for them to fit must be bigger safe to go with 33 units) Player Jump Height = 56 units __________________________________ Eye Height Standing = 62 units Eye Height Crouching = 44 units
Note:Player's collision box is axis aligned meaning to fit a corridor which is at 45 degree angle you need at least 46 units for player to fit (diagonal width of player is ~45.25 units)Note: Left 4 Dead 2 makes no difference between default jump and the "crouch jump" which usually gives you a higher jump height, because Valve decided to make the default jump height the crouch jump height.Miscellaneous
Max Obstacle Height = 18 units CI Max Climb Height = 180 units (Only works for CI when a navmesh connects two areas. SI require Infected-only Ladders.) Tank Max Climb Height = 200 units Small Door = 48x104 units Big Door = 56x104 units Normal Corridor Height = 128 units Normal Corridor Width = 64 units
Left 4 Dead 2 contains the 
Half-Life 2 dev_measure textures, some of which are not correct for Left 4 Dead 2. You can get Left 4 Dead 2–specific measurements from this workshop submission.