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An ACS library for ZDoom-based ports

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Standard ZDoom units

  • distance – mapunits
  • time – tics (or seconds in non-gameplay contexts)
  • angle – turns counterclockwise

Derived units

  • velocity – mapunits per tic
  • acceleration – mapunits per tic^2

Gravity is defined by free fall acceleration, and is measured using the same units as normal acceleration.

Non-standard units

These units should be converted to standard units before performing any operations with them.


  • meters, feet, and other nonsense – Doom doesn't have an accurate scale
  • sv_gravity units (800:1) – converted to acceleration by dividing by 800


  • seconds (35:1)
  • octics (4.375:1)


  • degrees (360:1)
  • radians (tau:1)
  • byte angles (256:1)
units.1499608691.txt.gz · Last modified: 2017/07/09 16:58 by korshun