下载源码 UnityPackage

1.Ray2D

让小球向右发射射线：

Ray2D ray;void Start()
{// Ray2D(起点，终点)ray = new Ray2D(this.transform.position, Vector2.right);// Debug.DrawLine(起点，终点，颜色，显示时间)Debug.DrawLine(ray.origin, ray.direction, Color.green, 1000);
}

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2.RaycastHit2D（射线检测）

返回鼠标单击对象的名字:

  RaycastHit2D hitInfo;void Update(){if (Input.GetMouseButtonDown(0)){hitInfo = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero);if (hitInfo.collider != null){Debug.Log(hitInfo.collider.gameObject.name);}}        }