The SDL forums have moved to discourse.libsdl.org.
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I needed a 3D system for my program SDK, and as it has been used in GLBasic, I decided to convert Trenki3D (http://www.trenki.net/)it for use to SDL2, and it works well : https://www.youtube.com/watch?v=AqCvOd-awoQ is a very basic test of it.

I chose it because I wanted to continual use SDL2's rendering functions and because I hope to be converting it all back to SDL1 on a system that doesnt't have (or need) a hardware graphics system (Trenki3D is software based).