Measurements

Various distances, dimensions, angles, and other measurements. Most of these were discovered by Fidcal.

Garrett's height (min height for doorway)   6 (It is possible to squeeze through 5.75)
Garrett's height when crouching   4
Garrett's width (min width for doorway)   2.5
     
Minimum height for mantling   7
Maximum height for mantling
  8
Maximum height for mantling from running jump
  10.5
Minimum wall thickness for mantling
  1.5
Minimum ledge depth for mantling   2.5 (eg, on cliff face)
     

Standing jump height

  2.5 ( + Garrett's 6 foot height = 8.5)
Running jump height
  4.5 (maximum wall height without mantling)
Forward jump from standing   7 (looking forward, jump key held during jump)
Running jump over gap
  8.5
Running jump over gap to mantle at same height   12
     
Maximum slope Garrett can ascend   56.25°
Maximum slope Garrett can ascend with speed potion   61.88°
    (If you take a running start, you can sometimes make some headway up a slope of 67.50° with a speed potion, but you'll slide back down again after a certain distance.)
     
Maximum slope AIs can ascend   61.88°
Maximum slope AIs will voluntarily descend  

61.88°

     
Standard arrow rope/vine length   30 (from end of arrow)