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Question by asdf123 · Mar 16, 2013 at 04:53 PM · rotationjavascripterrorquaternion

Gun Rotation

This script do that when I move the mouse X the gun rotates but i have an error:

 Assets/GunMoveMentewfweaf.js(18,33): BCE0024: The type 'UnityEngine.Quaternion' does not have a visible constructor that matches the argument list '(float, float, float)'.


The Script:

 public var RotateAmount : float = 1;
     public var RotateSpeed : float = 2; 
     public var GUN: GameObject; 
     public var RotateOnX : float; 
     public var RotateOnY : float; 
     public var DefaultRot : Quaternion; 
     public var NewGunRot : Quaternion; 
 
     function Start()
     {
         DefaultRot = transform.localRotation;
     }
 
     function Update ()
     {
         RotateOnX = Input.GetAxis( "Mouse X" ) *Time.deltaTime * RotateAmount; 
         RotateOnY = Input.GetAxis( "Mouse Y" ) *Time.deltaTime * RotateAmount; 
         NewGunRot = new Quaternion ( DefaultRot.x+ RotateOnX, DefaultRot.y+ RotateOnY, DefaultRot.z); 
         GUN.transform.localRotation = Quaternion.Lerp(GUN.transform.localRotation, NewGunRot , RotateSpeed * Time.deltaTime);
     }
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Answer by robertbu · Mar 16, 2013 at 04:56 PM

Quaternions are 4D and the constructor takes 4 parameters, and these parameters are not euler angles. To do what you want here use Quaternion.Euler:

  NewGunRot = Quaternion.Euler( DefaultRot.x+ RotateOnX, DefaultRot.y+ RotateOnY, DefaultRot.z); 

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avatar image asdf123 · Mar 16, 2013 at 08:12 PM 0
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tnks now works, but when i press "play" my gun rotates 90 Y without move the mouse, help :c

avatar image robertbu · Mar 16, 2013 at 08:24 PM 0
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Without understanding more of your project, it is difficult to figure out how to solve your problem. A couple of things. First isolate your gun from it rotation. You can do this by using an empty game object as a parent. Place the empty game object at teh pivot point for your gun. When you have your gun setup like you want, make it a child of an empty game. Apply your rotation code to the empty game object. In addition, you want to apply the X mouse movement to the Y axis rotation and the Y mouse movement to the X axis rotation. You have it opposite in your code.

avatar image asdf123 · Mar 16, 2013 at 08:30 PM 0
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thanks bro :)

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Answer by nsxdavid · Mar 16, 2013 at 05:02 PM

A Quaternion takes 4 arguments. You are trying to set the Quaternion from Euler angles.

This can be done, though... like this:

 public var NewGunRot:Quaternion = Quaternion.identity;;
 
 NewGunRot.eulerAngles = Vector3(( DefaultRot.x+ RotateOnX, DefaultRot.y+ RotateOnY, DefaultRot.z);
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