[Unity菜鸟] 摄像机视角控制

using UnityEngine;
using System.Collections;

public class CameraFollow : MonoBehaviour
{
	public Transform target;
	public float targetHeight;
	public float distance;
	public int maxDistance;
	public float minDistance;
	public float xSpeed;
	public float ySpeed;
	public int yMinLimit;
	public int yMaxLimit;
	public int zoomRate;
	public float rotationDampening;
	private float x;
	private float y;

	public CameraFollow()
	{
		this.targetHeight = 2f;
		this.distance = 5f;
		this.maxDistance = 20;
		this.minDistance = 2.5f;
		this.xSpeed = 250f;
		this.ySpeed = 120f;
		this.yMinLimit = -20;
		this.yMaxLimit = 80;
		this.zoomRate = 20;
		this.rotationDampening = 3f;
	}
	public void Start()
	{
		Vector3 eulerAngles = this.transform.eulerAngles;
		this.x = eulerAngles.y;
		this.y = eulerAngles.x;
		if (this.rigidbody)
		{
			this.rigidbody.freezeRotation = true;
		}
	}
	public void LateUpdate()
	{
		if (this.target)
		{
			if (Input.GetMouseButton(1) || Input.GetMouseButton(1))
			{
				this.x += Input.GetAxis("Mouse X") * this.xSpeed * 0.02f;
				this.y -= Input.GetAxis("Mouse Y") * this.ySpeed * 0.02f;
			}
			else
			{
				if (Input.GetAxis("Vertical") != (float)0 || Input.GetAxis("Horizontal") != (float)0)
				{
					float num = this.target.eulerAngles.y;
					float num2 = this.transform.eulerAngles.y;
					this.x = Mathf.LerpAngle(num2, num, this.rotationDampening * Time.deltaTime);
				}
			}
			this.distance -= Input.GetAxis("Mouse ScrollWheel") * Time.deltaTime * (float)this.zoomRate * Mathf.Abs(this.distance);
			this.distance = Mathf.Clamp(this.distance, this.minDistance, (float)this.maxDistance);
			this.y = ClampAngle(this.y, (float)this.yMinLimit, (float)this.yMaxLimit);
			Quaternion quaternion = Quaternion.Euler(this.y, this.x, (float)0);
			Vector3 position = this.target.position - (quaternion * Vector3.forward * this.distance + new Vector3((float)0, -this.targetHeight, (float)0));
			this.transform.rotation = quaternion;
			this.transform.position = position;
		}
	}
	public  float ClampAngle(float angle, float min, float max)
	{
		if (angle < (float)-360)
		{
			angle += (float)360;
		}
		if (angle > (float)360)
		{
			angle -= (float)360;
		}
		return Mathf.Clamp(angle, min, max);
	}
	
}

using UnityEngine;
using System.Collections;

public class CameraVirtual : MonoBehaviour
{
    //旋转的物体
    public GameObject building;

    //用来记录鼠标的位置，以便计算旋转幅度
    Vector2 p1, p2; 

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(1))
        {
            p1 = new Vector2(Input.mousePosition.x, Input.mousePosition.y);//鼠标右键按下时记录鼠标位置p1
        }
        if (Input.GetMouseButton(1))
        {
            p2 = new Vector2(Input.mousePosition.x, Input.mousePosition.y);//鼠标右键拖动时记录鼠标位置p2
            //下面开始旋转，仅在水平方向上进行旋转
            float dx = p2.x - p1.x;
            transform.RotateAround(building.transform.position, Vector3.up, dx * Time.deltaTime);
        }
    }

}