unity+射线检测

private Camera aRCamera; 
Ray ray;
RaycastHit hit;
aRCamera = GameObject.Find("RenderCamera").GetComponent<Camera>();
if (Input.GetMouseButtonDown(0))
{
 	startPos = Input.mousePosition;
        ray = aRCamera.ScreenPointToRay(startPos);
	Debug.DrawRay(ray.origin, ray.direction, Color.red);//1.射线可视
	//if(Physics.Raycast(ray,out hit2,int.MaxValue,1<<LayerMask.NameToLayer("Anim"))&&!EventSystem.current.IsPointerOverGameObject())//2.UI穿透问题，命名空间：using UnityEngine.EventSystems;
	//if(Physics.Raycast(ray,out hit2,int.MaxValue,1<<LayerMask.NameToLayer("Anim")))//3.选择层
	if(Physics.Raycast(ray,out hit))
	{
		    if (hit.collider != null)
                    {
                        if (hit.collider.tag == "Mode")
                        {
                            Debug.LogError(hit.point);//4.射线点击获取世界坐标

                            Debug.LogError(hit.collider.name);
                            currentHitObj = hit.collider.gameObject;
                        }
		    }
	}
}