unity 点积的使用 转化为角度

Posted 2020-10-01

1.

Cameraforwardvector = GameObject.Find("forwardPoint").transform.position - Camera.main.transform.position;
point2Cameravector =kk.position- Camera.main.transform.position ;
float hh=Mathf.Acos(Vector3.Dot(Cameraforwardvector.normalized, point2Cameravector.normalized)) * Mathf.Rad2Deg;
Debug.LogError(hh);
if(hh>=0&&hh<=90)
{
//显示设备对应的数据信息，信息从数据库或者本地txt里面获取
showInfoState = ShowInfoState.load;
roam.move_state = Roam.MoveState.showFacilityInfo;
UIIndex = int.Parse(kk.name);
dataLogicControl.GetFaciltyInfo(kk.name);
Current = kk;
}

2.注意

Vector3.Dot(Cameraforwardvector.normalized, point2Cameravector.normalized))

一定要加normalized

3.

角度：0-180度之间。没有负数值。