The previous post's quick cellular automaton approach to snowflakes was a bit crude. For more realism (but still with a lot of oversimplification), I wrote code for the Reiter snowflake growth model. This is a "real-valued" cellular automaton (or a finite-differences evolution).
With some randomness, things look even more realistic:
A better OpenSCAD implementation is here: https://www.thingiverse.com/thing:3270304
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