Positions in Arma games are always represented as arrays. There are two types of positions:
- 2D position: [X, Y]
- 3D position: [X, Y, Z]
On the map and on the terrain, the X-axis runs from west to east and the Y-axis runs from south to north. The origin [0, 0] is (usually) located in the bottom left corner.
While the Z-coordinate is always the height/altitude, the point relative to which that height is measured depends on the specific position format (see Types below).
There are a number of formats available in Real Virtuality:
|ASL:||Presumably "Above Sea Level"|
|ATL:||Presumably "Above Terrain Level"|
|ASLW:||Presumably "Above Sea Level including Waves"|
|AGL:||Presumably "Above Generic/Ground Level"|
|AGLS:||Presumably "Above Generic/Ground Level including Surfaces"|
|World:||Raw world coordinate system|
|Relative:||Position relative to an object within its model space|
|Config:||Position used in configs|
|Object:||When object is used for position, PositionWorld of the object is used|
|Visual:||Used for rendering objects on the screen. Useful for per-frame applications, such as drawIcon3D - see Command Group: Render Time Scope and Simulation vs Render Time Scope.|
This array only has two elements and is usually used with 2D information, for example standard markers or UI commands. If used with e.g distance, Z is assumed to be 0.
Z is measured from the sea level which is constant across the map.
See also: getPosASL, setPosASL, getPosASLVisual, visiblePositionASL, ASLToATL, ATLToASL, AGLToASL, ASLToAGL, eyePos, aimPos, getTerrainHeightASL, lineIntersects, lineIntersectsWith, lineIntersectsObjs, lineIntersectsSurfaces, terrainIntersectASL, playSound3D, setDefaultCamera
Z is measured from the surface of water at that position. Both waves and pond objects affect the result.
See also: getPosASLW, setPosASLW
Z is measured from the terrain level which varies across the map.
See also: getPosATL, setPosATL, getPosATLVisual, ASLToATL, ATLToASL
Z is the same as in PositionASLW when over sea and is the same as in PositionATL when over land. Most commands either take or return PositionAGL.
See also: modelToWorld, worldToModel, modelToWorldVisual, worldToModelVisual, positionCameraToWorld, intersect, terrainIntersect, isOnRoad, drawIcon3D, drawLine3D, distance, moveTo, doMove, move, setDestination, buildingPos, screenToWorld, worldToScreen, AGLToASL, ASLToAGL, unitAimPosition, unitAimPositionVisual
Over land, Z is measured as height over terrain level minus the height of surface over terrain level underneath. If such surface exists and is counted in, the resulting Z becomes 0.
Over sea it gets even more complicated as instead of PositionATL, PositionASLW is used minus the offset for the surface height, presumably over waves too, as Z seems static. As there is currently no way to obtain Hsurface, it becomes impossible to convert given PositionAGLS into other formats, unlike with other position formats.
See also: position, visiblePosition, getPos, getPosVisual
The function below will place passed object onto walkable surface, if there is one, otherwise on the ground. If only X and Y of the position are supplied, the object will be placed on surface, if Z is supplied, it will be treated as offset from the surface level.
Alternatively, setVehiclePosition can be used. It will put the object onto the nearest surface.
Similar to PositionASL, however Z is measured from the sea level to the the model centre [0, 0, 0] of the object, rather than transformed boundingCenter or land contact vertices.
See also: getPosWorld, setPosWorld, mapCenterOnCamera
Relative position is normally an [X, Y, Z] offset from the model centre.
See also: positionCameraToWorld, selectionPosition, attachTo, modelToWorld, worldToModel, modelToWorldVisual, worldToModelVisual, camPrepareRelPos, camSetRelPos
The format used in configs, such as mission.sqm, is [X, Z, Y], where Z and Y are swapped around. One other command that uses this format is positionCameraToWorld. Z in configs is measured from the sea level.