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Question by Ellie97 · Jun 18, 2018 at 10:24 AM · c#scalingtouch controls

Smooth scaling with touch input

Apologies if this has already been asked. I have an AR app which features models which can be scaled as you'd expect with dual finger touch. It works, but the scale of the objects will just snap to whatever the scale momentum is (essentially the distance between the two fingers) as soon as you touch the screen to begin scaling. As I am pitching this to a professional company, I want it to be polished and smooth so I want it to scale based on the CHANGE of distance from the instance the fingers touch the screen rather than the actual distance. Here is my code.

 private float scale_momentum = 0;
 private float scale_speed = 0.001f;
 private float prevDistance = 0;

 private Touch touchZero;
 private Touch touchOne;
 private Vector2 touchZeroPos;
 private Vector2 touchOnePos;

 private Vector2 touchDeltaPosition;

 void Update()
 {
     if (Input.touchCount == 2)
     {
         touchZero = Input.GetTouch(0);
         touchOne = Input.GetTouch(1);

         touchZeroPos = touchZero.position;
         touchOnePos = touchOne.position;

         scale_momentum = Vector2.Distance(touchZeroPos, touchOnePos) - prevDistance;

         prevDistance = Vector2.Distance(touchZeroPos, touchOnePos);
     }
     else
     {
         scale_momentum *= 0.9f;
         prevDistance = 0;
     }

     transform.localScale += Vector3.one * scale_momentum * scale_speed;
     transform.localScale = new Vector3(
         Mathf.Clamp(transform.localScale.x, 0.2f, 2f),
         Mathf.Clamp(transform.localScale.y, 0.2f, 2f),
         Mathf.Clamp(transform.localScale.z, 0.2f, 2f));
 }
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