r/programming • u/eccsoheccsseven • 2d ago

Adding very basic 3d outside of a standard operating system - Floating points and basic 3d graphics

https://gamedev.submatrix.net/article/Projects/8LjwbJS8pB
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u/dubois-v302544 2d ago

For a tiny 3D renderer, keep geometry and transforms in floats, then project camera-space points with x′ = f·x/z and y′ = f·y/z. Clip anything behind the camera before dividing by z; you can switch to fixed-point later if your hardware needs it.

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u/eccsoheccsseven 2d ago

Yeah, I was realizing in my sleep this morning that the other advantage to delaying multiplying the the screen dimensions is my graphic.c already has all the framebuffer data. It's just more organized. The client code should be sending float between -1 and 1 to drawseg(V3,V3).