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Adds rotate vector function #6145

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Adds rotate vector function #6145

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5c3707e
Adds function to rotate vector around another vector.
LorenLuke Feb 13, 2018
2fca91e
Conforms to code standards. Renames function.
LorenLuke Feb 13, 2018
057f863
Addresses Review. Updated to use Rodrigues Formula.
LorenLuke Feb 19, 2018
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30 changes: 30 additions & 0 deletions addons/common/functions/fnc_rotateVectorAroundVector.sqf
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Original file line number Diff line number Diff line change
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/*
* Author: LorenLuke
* Rotates the first vector around the second, clockwise by angle theta
*
* Arguments:
* 0: Vector <ARRAY>
* 1: Rotation Axis <ARRAY>
* 2: Angle <NUMBER>
*
* Return Value:
* Transformed Vector <ARRAY>
*
* Example:
* [eyeDirection player, weaponDirection (currentWeapon player), 45] call ace_common_fnc_rotateVectorAroundVector;
*
* Public: No
*/
#include "script_component.hpp"

params ["_vector1", "_vector2", "_theta"];

private _normalVector = vectorNormalized _vector2;
private = _s_theta = sin(_theta);
private = _c_theta = cos(_theta);

// Rodrigues Rotation Formula;
// https://wikimedia.org/api/rest_v1/media/math/render/svg/2d63efa533bdbd776434af1a7af3cdafaff1d578
private _returnVector = (_vector1 vectorMultiply _c_theta) vectorAdd ((_normalVector vectorCrossProduct _vector1) vectorMultiply _s_theta) vectorAdd (_normalVector vectorMultiply ((_normalVector vectorDotProduct _vector1) * (1 - _c_theta)));

_returnVector