求问！能获取世界坐标，但是用camera.main,WorldToScreenPoint()后，屏幕坐标x=NaN，不知道怎么回事

[qq_36474498]

我是新手，通过水果忍者游戏教学视频学习U3D，发现红色方块没法追踪右手运动，而且锚点在屏幕左下角，然后发现是世界坐标转换到屏幕坐标的时候出现问题的，x、y坐标都是0，后来修改摄像机参数，忘了改了啥坐标又变成x=NaN，y=582了，红色方块还是不动。下面是部分程序：

if(KinectManager.Instance.IsUserDetected())
		{
			//User is detected.
			long userId = KinectManager.Instance.GetPrimaryUserID();//Get user's ID.
			int  JointType=(int)KinectInterop.JointType.HandRight;//Righthand is the detected joint.

			if(KinectManager.Instance.IsJointTracked(userId,JointType))
			{
			
				Vector3 rightHandPos = KinectManager.Instance.GetJointPosition(userId,JointType);
				Vector3 rightHandScreenPos = Camera.main.WorldToScreenPoint(rightHandPos);
				print("rHPx= "+rightHandPos.x+" rHPy= "+rightHandPos.y+" rHPz= "+rightHandPos.z);
				print("rHSx= "+rightHandScreenPos.x+" rHSy= "+rightHandScreenPos.y+" rHSz= "+rightHandScreenPos.z);
				Vector2 rightHandSenPos = new Vector2( rightHandScreenPos.x, rightHandScreenPos.y);
				Vector2 rightHandUguiPos;

				if(RectTransformUtility.ScreenPointToLocalPointInRectangle((RectTransform)canvas.transform, rightHandSenPos, null, out rightHandUguiPos))
				{
					//Right hand is in the rectangle of canvas.
					RectTransform rightRectTf = rightHand.transform as RectTransform ; 
					rightRectTf.anchoredPosition = rightHandUguiPos ;

				}
				
			}
}