lineIntersects: Difference between revisions

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(Add example)
(Add game version for alternative syntax to description. Minor typo corrections. Reordered see also commands to be grouped and consistent across lineIntersects pages)
 
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|gr1= Math - Geometry
|gr1= Math - Geometry


|descr= Checks for object intersection with a virtual line between two positions. The alternative syntax does multiple checks at once, faster than multiple calls.
|descr= Checks for object intersection with a virtual line between two positions. Since {{GVI|arma3|2.20|size= 0.75}}, there is an alternative syntax that does multiple checks at once, faster than multiple calls.
{{Feature|informative|
{{Feature|informative|
* Does not work under water.
* Does not work under water.
* Max harcoded distance is 1000m.
* Max hardcoded distance is 1000m.
}}
}}


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|p2= endPos: [[Array]] format [[Position#PositionASL|PositionASL]]
|p2= endPos: [[Array]] format [[Position#PositionASL|PositionASL]]


|p3= objIgnore1: [[Object]] - (Optional, default [[objNull]]) object to ignore. When testing intersection from an object/unit/vehicle, pass that object here to prevent intersection inside of the object
|p3= objIgnore1: [[Object]] - (Optional, default [[objNull]]) object to ignore. When testing intersections from an object/unit/vehicle, pass that object here to prevent intersections inside of the object


|p4= objIgnore2: [[Object]] - (Optional, default [[objNull]]) another object to ignore. When testing intersection of a line between two objects, pass the second object here to prevent intersection inside of it being reported
|p4= objIgnore2: [[Object]] - (Optional, default [[objNull]]) another object to ignore. When testing intersections of a line between two objects, pass the second object here to prevent intersections inside of it being reported


|r1= [[Boolean]] - [[true]] if an intersection happens with an object (not with terrain)
|r1= [[Boolean]] - [[true]] if an intersection happens with an object (not with terrain)
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* begPos: [[Array]] format [[Position#PositionASL|PositionASL]]
* begPos: [[Array]] format [[Position#PositionASL|PositionASL]]
* endPos: [[Array]] format [[Position#PositionASL|PositionASL]]
* endPos: [[Array]] format [[Position#PositionASL|PositionASL]]
* objIgnore1: [[Object]] - (Optional, default [[objNull]]) object to ignore. When testing intersection from an object/unit/vehicle, pass that object here to prevent intersection inside of the object
* objIgnore1: [[Object]] - (Optional, default [[objNull]]) object to ignore. When testing intersections from an object/unit/vehicle, pass that object here to prevent intersections inside of the object
* objIgnore2: [[Object]] - (Optional, default [[objNull]]) another object to ignore. When testing intersection of a line between two objects, pass the second object here to prevent intersection inside of it being reported
* objIgnore2: [[Object]] - (Optional, default [[objNull]]) another object to ignore. When testing intersections of a line between two objects, pass the second object here to prevent intersections inside of it being reported


|r2= [[Array]] format [result1, result2, ...] - [[true]] if an intersection happens with an object (not with terrain) for the Nth element
|r2= [[Array]] format [result1, result2, ...] - [[true]] if an intersection happens with an object (not with terrain) for the Nth element
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|x1= <sqf>private _hasStraightLineToChopper = lineIntersects [eyePos player, aimPos chopper, player, chopper];</sqf>
|x1= <sqf>private _hasStraightLineToChopper = lineIntersects [eyePos player, aimPos chopper, player, chopper];</sqf>


|x2= <sqf>
|x2= Alternative syntax to check intersections in parallel:
<sqf>
private _enemies = units opfor;
private _enemies = units opfor;
private _enemyDataArray = _enemies apply { [eyePos player, aimPos _x, player, _x] };
private _enemyDataArray = _enemies apply { [eyePos player, aimPos _x, player, _x] };
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</sqf>
</sqf>


|seealso= [[lineIntersectsSurfaces]] [[intersect]] [[terrainIntersect]] [[terrainIntersectASL]] [[terrainIntersectAtASL]] [[lineIntersectsWith]] [[lineIntersectsObjs]] [[cursorObject]] [[cursorTarget]] [[checkVisibility]]
|seealso= [[lineIntersectsSurfaces]] [[lineIntersectsObjs]] [[lineIntersectsWith]] [[terrainIntersect]] [[terrainIntersectASL]] [[terrainIntersectAtASL]] [[intersect]] [[cursorObject]] [[cursorTarget]] [[checkVisibility]]
}}
}}


Latest revision as of 02:03, 1 December 2024

A2 OA Logo.png1.62tkoh logo small.png1.00Arma 3 logo black.png0.50
GAGlobal
Hover & click on the images for description

Description

Description:
Checks for object intersection with a virtual line between two positions. Since Arma 3 logo black.png2.20, there is an alternative syntax that does multiple checks at once, faster than multiple calls.
ⓘ
  • Does not work under water.
  • Max hardcoded distance is 1000m.
Groups:
Math - Geometry

Syntax

Syntax:
lineIntersects [begPos, endPos, objIgnore1, objIgnore2]
Parameters:
begPos: Array format PositionASL
endPos: Array format PositionASL
objIgnore1: Object - (Optional, default objNull) object to ignore. When testing intersections from an object/unit/vehicle, pass that object here to prevent intersections inside of the object
objIgnore2: Object - (Optional, default objNull) another object to ignore. When testing intersections of a line between two objects, pass the second object here to prevent intersections inside of it being reported
Return Value:
Boolean - true if an intersection happens with an object (not with terrain)

Alternative Syntax

Syntax:
lineIntersects [element1, element2, ...]
Parameters:
elementN: Array format [begPos, endPos, objIgnore1, objIgnore2]:
  • begPos: Array format PositionASL
  • endPos: Array format PositionASL
  • objIgnore1: Object - (Optional, default objNull) object to ignore. When testing intersections from an object/unit/vehicle, pass that object here to prevent intersections inside of the object
  • objIgnore2: Object - (Optional, default objNull) another object to ignore. When testing intersections of a line between two objects, pass the second object here to prevent intersections inside of it being reported
Return Value:
Array format [result1, result2, ...] - true if an intersection happens with an object (not with terrain) for the Nth element

Examples

Example 1:
private _hasStraightLineToChopper = lineIntersects [eyePos player, aimPos chopper, player, chopper];
Example 2:
Alternative syntax to check intersections in parallel:
private _enemies = units opfor; private _enemyDataArray = _enemies apply { [eyePos player, aimPos _x, player, _x] }; private _result = lineIntersects _enemyDataArray;

Additional Information

See also:
lineIntersectsSurfaces lineIntersectsObjs lineIntersectsWith terrainIntersect terrainIntersectASL terrainIntersectAtASL intersect cursorObject cursorTarget checkVisibility

Notes

Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
Lou Montana - c
Posted on May 31, 2012 - 10:46 (UTC)
Please note the difference:
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