在执行sdk中的3d_viewer时,安装完了opengl,但是提示“You just need the `freeglut.dll` file, from any of the 'Windows binaries' downloads. Place the DLL next to your Python script, or install it somewhere in your PATH to allow any script to use it.”,freeglut.dll也下载完了并且保存在了c:/windows/system32目录中,也在环境变量中加入了,仍然有这个提示。所以想问问贴吧里面的大佬,有知道这个问题怎么解决的吗?