And here's attached zip file of a low-poly (because of the forum 8Mb upload file size limitation, full hi-poly geometry is about 70Mb in this example) 3d OBJ file that came out of it. With proper game settings (like first-person view and intent on actually capturing all angles of the level) the results would be better.
This is what it looks like in 3D view (note, this was obtained from a YouTube video, not from GPU video memory locally):
Spoiler
83ac1cf7fd3e0ff01696cde41dd81cc06e5c8c3970489109a65bde6c94c16d22.zip