Camera Touch pan movement inconsistent across different screen resolutions.

Question

I currently have this code.

 if (Input.touchCount == 1) {
             if (Input.GetTouch (0).phase.Equals (TouchPhase.Moved)) {
                 NewPos += new Vector3 (
                     -Input.GetTouch(0).deltaPosition.x/Screen.width*panSpeed,
                     0,
                     -Input.GetTouch(0).deltaPosition.y/Screen.height*panSpeed
                     );    
             }
         }

which is my attempt to normalize the Touch deltaPositions. but even after dividing with screen width/height, I still notice a massive difference in speed when running it on my phone, compared to the smaller window in unity.

My phone has a resolution of 1280x720. and android phones range from everything between 480p to 2k screen resolutions.

Is there a way to make the camera movement speed consistent across all devices?

Answer 1

Answer by dheffner2001 · Oct 20, 2020 at 08:09 PM

This post is from 2014 but i think many people might have the same question. This is my solution:

     public float minXPos = -12f; 
     public float maxXPos = 100f;
     public float minYPos = -100f;
     public float maxYPos = 100f;
     void Update()
     {
         if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Moved)
         {
             float screenSize = Mathf.Max(Screen.width, Screen.height);
             Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
             Vector2 touchDeltaPercentage = touchDeltaPosition / screenSize;
 
             Vector3 screenCenter = new Vector3(Screen.width * 0.5f, Screen.height * 0.5f, 1f);
             Vector3 screenTouch = screenCenter + new Vector3(touchDeltaPosition.x, touchDeltaPosition.y, 0f);
 
             Vector3 worldCenterPosition = Camera.main.ScreenToWorldPoint(screenCenter);
             Vector3 worldTouchPosition = Camera.main.ScreenToWorldPoint(screenTouch);
 
             Vector3 worldDeltaPosition = worldTouchPosition - worldCenterPosition;
 
             //touchDeltaPercentage values will now range from 0 to 1
 
             //define camera border in minXPos, maxXPos, minYPos and maxYPos
             transform.Translate(-worldDeltaPosition);
             Vector3 tmpPosX = transform.position;
             tmpPosX.x = Mathf.Clamp(tmpPosX.x, minXPos, maxXPos);
             transform.position = tmpPosX;
 
             Vector3 tmpPosY = transform.position;
             tmpPosY.y = Mathf.Clamp(tmpPosY.y, minYPos, maxYPos);
             transform.position = tmpPosY;
         }
 }

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Tyrant7 · Mar 07 at 02:37 AM 0

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This worked very nicely for me, thank you! If anybody is looking for a version for mouse this is my version:

             if (Input.GetMouseButtonDown(2))
             {
                 deltaMousePos = Input.mousePosition;
             }
             else if (Input.GetMouseButton(2))
             {
                 Vector2 mouseDeltaPosition = Input.mousePosition - deltaMousePos;
     
                 Vector3 screenCenter = new Vector3(Screen.width * 0.5f, Screen.height * 0.5f, 1f);
                 Vector3 screenTouch = screenCenter + new Vector3(mouseDeltaPosition.x, mouseDeltaPosition.y, 0f);
     
                 Vector3 worldCenterPosition = Camera.main.ScreenToWorldPoint(screenCenter);
                 Vector3 worldTouchPosition = Camera.main.ScreenToWorldPoint(screenTouch);
     
                 Vector3 worldDeltaPosition = worldTouchPosition - worldCenterPosition;
     
                 //touchDeltaPercentage values will now range from 0 to 1
     
                 //define camera border in minXPos, maxXPos, minYPos and maxYPos
                 transform.Translate(-worldDeltaPosition * panMultiplier);
                 Vector3 tmpPosX = transform.position;
                 tmpPosX.x = Mathf.Clamp(tmpPosX.x, minXPos, maxXPos);
                 transform.position = tmpPosX;
     
                 Vector3 tmpPosY = transform.position;
                 tmpPosY.y = Mathf.Clamp(tmpPosY.y, minYPos, maxYPos);
                 transform.position = tmpPosY;
     
                 deltaMousePos = Input.mousePosition;
             }

Camera Touch pan movement inconsistent across different screen resolutions.

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