Horiz
The horiz member of the player structure controls the angle at which the player is looking up or down. A value of 100 equates to looking straight ahead; 299 is looking all the way up and -99 is looking all the way down.
gamevar TEMP 0 0
actor APLAYER MAXPLAYERHEALTH PSTAND 0 0
  ifhitspace // slowly angle the player's view downwards when use is held
  {
    getplayer[THISACTOR].horiz TEMP
    ifvarg TEMP -99
      addvar TEMP -1
    setplayer[THISACTOR].horiz TEMP
  }
  ifaction 0
    action PSTAND
...