哪位大佬知道图像实时显示怎么搞，B站有教程那个，一模一样，做不出来

赎罪的吸血獠

V setobjecttexture 【0,"#(argb,512,512,1)r2t(UAV,1)"】;
cam = "camera" camcreate 【0,0,0】;
cam cameraeffect 【"internal","back","UAV"】;
cam attachto [UAV,【0,0,0】,"PiP0_pos"];
addmissioneventhandler 【"draw3D",{
      _dir = (UAV selectionposition "PiP0_pos") vectorfromto (UAV selectionposition "PiP0_dir");
      _ndir = [-(_dir select 1),(_dir select 0),0】;
      _udir =  _dir vectorcrossproduct _ndir;
      cam setvectordirandup 【_dir, _udir】;
}];

链接在这儿：
https://www.bilibili.com/video/a ... 4907445260786458403
实在找不出哪里错误什么原因。就是不能用，跪求大佬指点