I place a camera into the scene. And it’s normal when I use perspective projection mode. but when I change it to the orthographic projection mode. It can only capture black scene.
Apparently, this has been a problem for about a years 
Anyway, thanks a lot. It seems that I’m not alone 
.By the way, do you know how to keep the aspect ratio of the camera consistent with the resolution of the screen.
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No idea, sorry 