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K-Francis-H/named_seed.scad

Created January 28, 2022 21:11
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A poly rolling hash implementation in OpenSCAD. Useful for making procedurally generated 3D objects with named seed values.
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named_seed.scad
function poly_rolling_hash(seed, idx, hash, ppow, p, m) = len(seed) == idx ?
hash :
poly_rolling_hash(seed, idx+1, (hash + (ord(seed[idx]) - ord("a") + 1) * ppow) % m, (ppow * p) % m, p, m);
function seed_from_string(string) = poly_rolling_hash(string, 0, 0, 1, 31, pow(10,9)+9);
//how to use:
rand_val = rands(0, 100, 1, seed_value=seed_from_string("human readable seed") );
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