孙广东 2015.8.16
目的 : 我们能简单的通过 鼠标位置 得到目标对象 如果没有使用刚体组件
Step - 1: 在3D项目中设置场景. 一个空对象命名为: DragAndDrop ,和创建一些其他的游戏对象 如 sphere, cube 等
- 感觉如下l;Step - 2: C# 脚本命名为 "GameobjectDragAndDrop".
Step - 3: 添加方法:
GameObject ReturnClickedObject(out RaycastHit hit) { GameObject target = null; Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (Physics.Raycast(ray.origin, ray.direction * 10, out hit)) { target = hit.collider.gameObject; } return target; }
void Update() { if (Input.GetMouseButtonDown(0)) { RaycastHit hitInfo; target = ReturnClickedObject(out hitInfo); if (target != null) { isMouseDrag = true; Debug.Log("target position :" + target.transform.position); //Convert world position to screen position. screenPosition = Camera.main.WorldToScreenPoint(target.transform.position); offset = target.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPosition.z)); } } if (Input.GetMouseButtonUp(0)) { isMouseDrag = false; } if (isMouseDrag) { //track mouse position. Vector3 currentScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPosition.z); //convert screen position to world position with offset changes. Vector3 currentPosition = Camera.main.ScreenToWorldPoint(currentScreenSpace) + offset; //It will update target gameobject's current postion. target.transform.position = currentPosition; } }