I made this using Stella 4d, which you can try for yourself, for free, at http://www.software3d.com/Stella.php.
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RobertLovesPi.net 
i can see staircases in there!
On Sat, Jan 26, 2019 at 7:13 PM RobertLovesPi.net wrote:
> RobertLovesPi posted: ” I made this using Stella 4d, which you can try for > yourself, for free, at http://www.software3d.com/Stella.php. ” >
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