ピンチインカメラ（エディタではなく端末向け）

gistfile1.cs

using UnityEngine;
using System.Collections;

public class PinchInCamera : MonoBehaviour {
	
	public float minHeight = 1.0f;
	public float maxHeight = 10.0f;
	private float touchDistance = 0.0f;
	private float scaleSpeed = 0.1f;

	void Update () {
		if (Input.touchCount >= 2)
		{
			Vector2 touch0, touch1;
			touch0 = Input.GetTouch(0).position;
			touch1 = Input.GetTouch(1).position;

			// 触れ始めが基準
			if(Input.GetTouch(1).phase == TouchPhase.Began){
				touchDistance = scaleSpeed * Vector2.Distance(touch0, touch1);
			}

			// 動いたときにカメラの高さを変える
			else if(Input.GetTouch(1).phase == TouchPhase.Moved){
				float distance = scaleSpeed * Vector2.Distance(touch0, touch1);
				float diff = distance - touchDistance;

				this.transform.position -= Vector3.up * diff;

				// cap
				var pos = this.transform.position;
				if(pos.y < minHeight){
					this.transform.position = new Vector3(pos.x, minHeight, pos.z);
				}else if (pos.y > maxHeight){
					this.transform.position = new Vector3(pos.x, maxHeight, pos.z);
				}

				// update
				touchDistance = distance;
			}
		}

		if (Input.touchCount == 1) {
			Debug.Log(Input.GetTouch(0).position);

			if(Input.GetTouch(0).phase == TouchPhase.Moved){
				var delta = Input.GetTouch(0).deltaPosition;
				float moveScale = 0.1f;
				this.transform.position -= new Vector3(delta.x, 0, delta.y) * moveScale;
			}
		}

	}
}