Mouse wheel zoom

Question

how can i change a variable smoothly with the mouse wheel (maybe using mathf.Lerp or some kind of interpolation)

I need to change the distance var.

Code:

 var target : Transform;
 var distance = 10.0;
 
 var xSpeed = 250.0;
 var ySpeed = 120.0;
 
 var yMinLimit = -20;
 var yMaxLimit = 80;
 
 private var x = 0.0;
 private var y = 0.0;
 
 @script AddComponentMenu("Camera-Control/Mouse Orbit 2")
 
 function Start () {
     var angles = transform.eulerAngles;
     x = angles.y;
     y = angles.x;
 
     // Make the rigid body not change rotation
        if (rigidbody)
         rigidbody.freezeRotation = true;
 }
 
 function LateUpdate () {
     if (target && Input.GetKey(KeyCode.Mouse1)) {
         x += Input.GetAxis("Mouse X") * xSpeed * 0.02;
         y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02;
      
         y = ClampAngle(y, yMinLimit, yMaxLimit);
     }
  
     var rotation = Quaternion.Euler(y, x, 0);
     var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
 
     transform.rotation = rotation;
     transform.position = position;
 }
 
 static function ClampAngle (angle : float, min : float, max : float) {
     if (angle < -360)
         angle += 360;
     if (angle > 360)
         angle -= 360;
     return Mathf.Clamp (angle, min, max);
 }

Answer 1

Answer by alucardj · Dec 01, 2013 at 05:02 AM

It's hard to find the correct syntax for scrollwheel. It's not in Input or GetAxis :

 Input.GetAxis("Mouse ScrollWheel")

add this to your code :

 var distanceMin : float = 3.0;
 var distanceMax : float = 10.0;
 var zoomSpeed : float = 2.0;
 
 // in function
 distance = Mathf.Clamp( distance + Input.GetAxis("Mouse ScrollWheel") * zoomSpeed, distanceMin, distanceMax );

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CookieKirby · Dec 01, 2013 at 07:10 PM 0

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Which function?

EDIT: whenever i try to use this, it jumps back to the starting point

robertbu · Dec 01, 2013 at 07:15 PM 1

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The code goes in LateUpdate(). Note this will produce an immediate change. A bit more work would be necessary to get a smooth change in distance.

robertbu · Dec 01, 2013 at 07:29 PM 1

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The last line should be:

 distance = Mathf.Clamp( distance + Input.GetAxis("Mouse ScrollWheel") * zoomSpeed, distanceMin, distanceMax );

alucardj · Dec 02, 2013 at 04:54 AM 0

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Oops, forgot the add the current distance, thanks robertbu

Mouse wheel zoom

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