PinchZoom for iOS (move camera instead of real zoom)

Unity Engine
,
1

Hello again,
I’m currently developing an App in which you can move around a 3D Model of a building (some kind of architecural visualization)
I found a script for PinchZooming on iOS devices, but my problem is that I dont want a real camera zoom, I want to move the camera.
The problem with a real zoom is, that you cant look perfectly in the rooms of the building.

Here is the code I am using at the moment. I’d really appreciate some help because I’m not very familiar with coding and scripting.

using UnityEngine;

public class PinchZoom : MonoBehaviour
{
	public float perspectiveZoomSpeed = 0.5f;        // The rate of change of the field of view in perspective mode.
	public float orthoZoomSpeed = 0.5f;        // The rate of change of the orthographic size in orthographic mode.

	public bool showMenu = true;
	//public GameObject data;
		
	void LateUpdate()
	{

		if(showMenu)
		{
			// If there are two touches on the device...
			if (Input.touchCount == 2)
			{
				// Store both touches.
				Touch touchZero = Input.GetTouch(0);
				Touch touchOne = Input.GetTouch(1);
			
				// Find the position in the previous frame of each touch.
				Vector2 touchZeroPrevPos = touchZero.position - touchZero.deltaPosition;
				Vector2 touchOnePrevPos = touchOne.position - touchOne.deltaPosition;
			
				// Find the magnitude of the vector (the distance) between the touches in each frame.
				float prevTouchDeltaMag = (touchZeroPrevPos - touchOnePrevPos).magnitude;
				float touchDeltaMag = (touchZero.position - touchOne.position).magnitude;
				
				// Find the difference in the distances between each frame.
				float deltaMagnitudeDiff = prevTouchDeltaMag - touchDeltaMag;

				// If the camera is orthographic...
				if (camera.isOrthoGraphic)
				{
					// ... change the orthographic size based on the change in distance between the touches.
					camera.orthographicSize += deltaMagnitudeDiff * orthoZoomSpeed;
					
					// Make sure the orthographic size never drops below zero.
					camera.orthographicSize = Mathf.Max(camera.orthographicSize, 0.1f);
				}
				else
				{
					// Otherwise change the field of view based on the change in distance between the touches.
					camera.fieldOfView += deltaMagnitudeDiff * perspectiveZoomSpeed;
					
					// Clamp the field of view to make sure it's between 0 and 180.
					camera.fieldOfView = Mathf.Clamp(camera.fieldOfView, 0.1f, 179.9f);
				}
			}
		}
	}
}

Thanks a lot for taking time to read my post.

2

You’d probably just want to move the ‘camera.transform.position’ instead of changing the field of View.

In the last lines of the code you can change this:

camera.fieldOfView += deltaMagnitudeDiff * perspectiveZoomSpeed;

to this:

camera.transform.positon += camera.transform.forward * ( deltaMagnitudeDiff * perspectiveZoomSpeed );

and get rid of the line below it that clamps the field of view value.

Cheers,T