Did you use Blender for the rendering the stills?
I've wanted to do a similar concept with photographs.
A downloadable game for Windows, macOS, and Linux
Ex Aeternum is my entry to the fourty-seventh Ludum Dare Compo. I wasn't quite able to finish it properly, so it's more of a proof-of-concept for using pre-rendered images in a semi-freeroam environment.
You can find the source code here.
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