Classes:MapMarker

A map marker is an actor which shows up on the automap, and can be used to point out points of interest, specific monsters, etc. Inherit from this class to create your own custom map marker. Setting the thing's special arguments can be used to control its behavior. If the first argument is non-zero, the map marker will follow the thing with the same TID as specified. If the second argument is 1, then the map marker will not show up until the player has seen the sector it resides in. If the third argument is 1, the map marker scales relative to the automap zoom, rather than keep a constant scale.

Note: Wait! Stop! Before you copy this actor's definition into your mod, remember the following things:

You do not need to copy that actor, since it is already defined.
In fact, it's not just useless, it's actually harmful as it can cause problems.
If you want to modify it, or use a modified version, using inheritance is the way to go.
The actor definitions here are put on the wiki for reference purpose only. Learn from them, don't copy them.
There is only one exception: if what you want is changing Ammo capacity, you need to create a new type from Ammo.

Classes: MapMarker

You can use Thing_Activate and Thing_Deactivate to turn map markers on and off, due to a typo in the original implementation, dormancy is reversed: Activating hides the map marker, while Deactivating shows the map marker. Also, this feature ONLY works through ACS, meaning map markers intended to be hidden by default need to be manually "Activated" in the OPEN script. (protip: put them all in a single range and use a loop)

DECORATE definition

ACTOR MapMarker native
{
  +NOBLOCKMAP
  +NOGRAVITY
  +DONTSPLASH
  +INVISIBLE
  Scale 0.5
  States
  {
  Spawn:
    AMRK A -1
    Stop
  }
}

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Map marker
Actor type	Map spot	Game
DoomEd Number	9040	Class Name	MapMarker