Sounds great! I would still call it a rendering engine, I don’t think it matters how large the scope is. It looks like you’re on a good path forward, I’m sure you’ll get it soon! Don’t go too crazy on the optimizations is my only recommendation.

Do you render with GPU or CPU? In any case, sort the vertices by distance and it should come together for you.

But wait, there’s more!

Covid and farm animals: nine pandemics that changed the world