RenderTexture

1. 创建renderertexture赋值摄像机

• 用RawImage方式
• 用Graphics.DrawTexture

  void OnGUI()
  {
      if (isshow)
      {
          if (Event.current.type.Equals(EventType.Repaint))
          {
            Graphics.DrawTexture(new Rect(200, 100, 128, 128), tex);
        }
      }
  }