滑鼠滾動拉近模型、滑鼠右鍵旋轉模型、滑鼠中鍵拖拽模型

把如下程式碼直接掛在攝像機物件上

using UnityEngine;
using System.Collections;

public class Script_07_11 : MonoBehaviour
{

public Transform target;
private int MouseWheelSensitivity = 1;
private int MouseZoomMin = 1;
private int MouseZoomMax = 5;
private float normalDistance = 3;

private
 
 Vector3 normalized;

private float xSpeed = 250.0f;
private float ySpeed = 120.0f;

private int yMinLimit = -20;
private int yMaxLimit = 80;

private float x = 0.0f;
private float y = 0.0f;

private Vector3 screenPoint;
private Vector3 offset;

private Quaternion rotation = Quaternion.Euler(new Vector3(30f,0f,0
 
f));
private Vector3 CameraTarget;
void Start ()
{

    CameraTarget = target.position;

    float z = target.transform.position.z - normalDistance;
    transform.position = rotation * new Vector3(transform.position.x,transform.position.y,z);

    transform.LookAt(target);

    var angles = transform.eulerAngles;
    x = angles.y;
    y = angles.x;
}

void
 
 Update ()
{

    if(Input.GetMouseButton(1))
    {
         x += Input.GetAxis(“Mouse X”) * xSpeed * 0.02f;
         y -= Input.GetAxis(“Mouse Y”) * ySpeed * 0.02f;

         y = ClampAngle(y, yMinLimit, yMaxLimit);

         var rotation = Quaternion.Euler(y, x, 0);
         var position = rotation * new Vector3(0.0f, 0.0f, -normalDistance) + CameraTarget;

         transform.rotation = rotation;
         transform.position = position;

    }
    else if (Input.GetAxis(“Mouse ScrollWheel”) != 0)
    {
        normalized = (transform.position - CameraTarget).normalized;
    }

    if (normalDistance >= MouseZoomMin && normalDistance <= MouseZoomMax)
    {
        normalDistance -= Input.GetAxis(“Mouse ScrollWheel”) * MouseWheelSensitivity;
    }
    if (normalDistance < MouseZoomMin)
    {
        normalDistance = MouseZoomMin;
    }
    if (normalDistance > MouseZoomMax)
    {
        normalDistance = MouseZoomMax;
    }

    transform.position =    normalized * normalDistance;

    }
    else if(Input.GetMouseButtonDown(2))
    {
         screenPoint = Camera.main.WorldToScreenPoint(target.transform.position);
        offset = target.transform.position - Camera.main.ScreenToWorldPoint(new        Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
    }

    if(Input.GetMouseButton(2))
    {
        Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);

        Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
        target.transform.position = curPosition;
    }
    transform.LookAt(CameraTarget);

}

static float ClampAngle (float angle , float min ,float  max)
{
    if (angle < -360)
    angle += 360;
    if (angle > 360)
    angle -= 360;
    return Mathf.Clamp (angle, min, max);
}