Unity 拖动3d物体跟随鼠标（手指）移动

1.不垂直于地面的情况是 通过射线检测地面 返回碰撞的点 直接赋值给当前物体  也可以用于垂直于地面的情况 

2.在移动端只需要把Input.mousePosition替换成Input.GrtTouch(0).position即可

if (Input.GetMouseButtonDown(0)){Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);RaycastHit hit;if (Physics.Raycast(ray, out hit)){Debug.Log(hit.collider.gameObject.tag);if (hit.collider.gameObject.CompareTag("sheep")){currentObj = hit.collider.transform;sheep = currentObj.GetComponent();sheep.StartDrag();objScreenPos = mainCamera.WorldToScreenPoint(currentObj.position);Vector3 mousePos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, objScreenPos.z);mousePos = mainCamera.ScreenToWorldPoint(mousePos);offest = currentObj.position - mousePos;}}}if (Input.GetMouseButton(0)){if (currentObj != null){//相机视野方向垂直于地面时Vector3 curMousePos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, objScreenPos.z);curMousePos = mainCamera.ScreenToWorldPoint(curMousePos);Vector3 newPos = curMousePos + offest;currentObj.transform.position = new Vector3(newPos.x, currentObj.position.y, newPos.z);//相机视野方向不垂直于地面时//Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);//RaycastHit hit;//if (Physics.Raycast(ray, out hit, 100, 1 << 9))//{//    currentObj.transform.position = hit.point;//}yield return new WaitForFixedUpdate();}}

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