Difference between revisions of "lineIntersectsSurfaces"

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Latest revision as of 23:44, 26 September 2020

Introduced with Arma 3 version 1.501.50Arguments of this scripting command don't have to be local to the client the command is executed on
Hover & click on the images for descriptions

Description

Description:
Returns list of intersections with surfaces from begPosASL to endPosASL. If there is ground intersection, it is also included. Works on units. Works underwater. Doesn't return intersection with sea surface. Hardcoded max distance: 5000m. By default, for speed purposes, command will return only 1st intersection with unique objects. Since Arma 3 v1.69.140138, this could be tweaked with an optional param.
If begPosASL is under the ground and endPosASL is above it, the command will only return intersection with the ground, this is engine limitation and none of the intersectXXX commands will work when initiated from under the ground.

Since Arma v1.51.131920 it is possible to indicate primary and secondary LOD to look for intersection. Available options are:

  • "FIRE"
  • "VIEW"
  • "GEOM"
  • "IFIRE" - ("I" stands for Indirect, practically the same as FIRE)
  • "NONE"
  • "PHYSX" - PhysX geometry LOD (since Arma 3 v2.01.146666)

Default LODs are "VIEW" and "FIRE"

Only a single LOD is checked for intersection. LOD1 is Primary LOD and will be checked first. LOD2 is Secondary LOD. If LOD1 is not possible to check, LOD2 will be used.

Syntax

Syntax:
lineIntersectsSurfaces [begPosASL, endPosASL, ignoreObj1, ignoreObj2, sortMode, maxResults, LOD1, LOD2, returnUnique]
Parameters:
[begPosASL, endPosASL, ignoreObj1, ignoreObj2, sortMode, maxResults, LOD1, LOD2]: Array
begPosASL: PositionASL - virtual line start
endPosASL: PositionASL - virtual line end
ignoreObj1 (Optional): Object - first object to ignore or objNull: Default: objNull
ignoreObj2 (Optional): Object - second object to ignore or objNull: Default: objNull
sortMode (Optional): Boolean - true: closest to furthest, false: furthest to closest. Default: true
maxResults (Optional): Number - Max results to return. -1 to return every result. Default: 1
LOD1 (Optional): String (added in v1.51.131920) - Primary LOD to look for intersection. Default: "VIEW"
LOD2 (Optional): String (added in v1.51.131920) - Secondary LOD to look for intersection. Default: "FIRE"
returnUnique (Optional): Boolean (added in v1.69.140138) - When false, all intersections in the same object are included not just the 1st one. Default: true
Return Value:
Array of intersections in format [[intersectPosASL, surfaceNormal, intersectObj, parentObject],...] where:
  • intersectPosASL - the actual position where line intersects surface
  • surfaceNormal - a normal to the intersected surface
  • intersectObject - the object the surface belongs to (could be proxy object) - objNull if terrain
  • parentObject - the object proxy object belongs to (not always the same as intersect object) - objNull if terrain

Examples

Example 1:
_intersections = lineIntersectsSurfaces [eyePos player, aimPos chopper, player, chopper, true, -1];
Example 2:
arrow = "Sign_Arrow_F" createVehicle [0,0,0]; onEachFrame { _ins = lineIntersectsSurfaces [ AGLToASL positionCameraToWorld [0,0,0], AGLToASL positionCameraToWorld [0,0,1000], player ]; if (count _ins == 0) exitWith {arrow setPosASL [0,0,0]}; arrow setPosASL (_ins select 0 select 0); arrow setVectorUp (_ins select 0 select 1); hintSilent str _ins; };
Example 3:
This should detect glass windows and wire fences (since Arma v1.51.131920): wirefence = "Land_New_WiredFence_5m_F" createVehicle position player; arrow = "Sign_Arrow_F" createVehicle [0,0,0]; onEachFrame { _ins = lineIntersectsSurfaces [ AGLToASL positionCameraToWorld [0,0,0], AGLToASL positionCameraToWorld [0,0,1000], player, objNull, true, 1, "GEOM", "NONE" ]; if (count _ins == 0) exitWith {arrow setPosASL [0,0,0]}; arrow setPosASL (_ins select 0 select 0); arrow setVectorUp (_ins select 0 select 1); hintSilent str _ins; };

Additional Information

See also:
lineIntersectsWithlineIntersectsObjsterrainIntersectterrainIntersectASLterrainIntersectAtASLlineIntersectsintersectcursorObjectcursorTargetcheckVisibility
Groups:
Math - Geometry

Notes

i
Only post proven facts here. Report bugs on the Feedback Tracker and discuss on the Arma Discord or on the Forums.

Notes

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Posted on August 27, 2015 - 12:44 (UTC)
Killzone Kid
Fast check if object is in a house:KK_fnc_inHouse = { lineIntersectsSurfaces [ getPosWorld _this, getPosWorld _this vectorAdd [0, 0, 50], _this, objNull, true, 1, "GEOM", "NONE" ] select 0 params ["","","","_house"]; if (_house isKindOf "House") exitWith {true}; false }; onEachFrame {hintSilent str (player call KK_fnc_inHouse)};
Posted on January 30, 2016 - 20:10 (UTC)
Pierre MGI
This command is useful to place weaponholder (and then spawned weapons) on floor of houses, correcting the spawn position (can_collide) to intersect with floor: MGI_fnc_setPosAGLS = { params ["_obj", "_pos"]; _wh_pos = getPosASL _obj; _pos set [2, (ATLtoASL _pos select 2)-10]; _ins = lineIntersectsSurfaces [_wh_pos, _pos,_obj,objNull, true,1,"VIEW","FIRE"]; _surface_distance = if (count _ins > 0) then [{(_ins select 0 select 0) distance _wh_pos},{0}]; _wh_pos set [2, (getPosASL _obj select 2) - (_surface_distance)]; _weaponholder setPosASL _wh_pos; }; After the position (_pos) obtained in BIS_fnc_buidingPositions array: _weaponholder = createVehicle ["groundWeaponHolder", _pos, [], 0, "CAN_COLLIDE"]; [_weaponholder,_pos] call MGI_fnc_setPosAGLS; Then fill your weapon holder.