ACE3/addons/core/functions/fn_getWeaponAzimuthAndInclination.sqf

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/*
* Author: commy2
*
* Get players weapon direction and slope
*
* Argument:
* 0: Weapon name (String)
*
* Return value:
* 0: Azimuth (Number)
* 1: Inclination or 'slope' (Number)
*/
private ["_weapon", "_direction", "_azimuth", "_inclination"];
_weapon = _this select 0;
_direction = AGM_player weaponDirection _weapon;
_azimuth = (_direction select 0) atan2 (_direction select 1);
_inclination = asin (_direction select 2);
if (_azimuth < 0) then {_azimuth = _azimuth + 360};
[_azimuth, _inclination]