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public Camera cam;public Transform trans;Vector2 startPosiotion;float startZ;//此物距离trans的z距离private float zDistance => transform.position.z - trans.transform.position.z;void Start(){startPosiotion = transform.position;startZ = transform.position.z;}// Update is called once per framevoid Update(){// 相机移动距离减初始距离，获取相机偏移距离Vector2 camMove = (Vector2)cam.transform.position - startPosiotion;//获取人物前还是后,相机前用近裁剪面，后用远裁剪面float clippingPlane = cam.transform.position.z + (zDistance > 0 ? cam.farClipPlane : cam.nearClipPlane);//计算视差因子float parallaxFactor = Mathf.Abs(zDistance) / clippingPlane;//获取背景需要偏移的x,y位置Vector2 backgroundPos = startPosiotion + camMove * parallaxFactor;//因为是2d，所以z不变Vector3 newPosition = new Vector3(backgroundPos.x, backgroundPos.y, startZ);transform.position = newPosition;}
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