Convert 3D object to sprite stack

Define the fidelity of 3d model. e.g. If it's a sphere, 5x5x5 pixels

Assess each section, and if volume is >50% (or whatever user preference set) then draw a pixel.

Color is whatever the average colours are of surface faces are for that section, otherwise just set it to black.

For an MVP, it'd even be fantastic just to have transparent when no model exists, and black when it does and let the user fill it in. i.e. We are giving users a skeleton to start from & saving a lot of time!