day22.py

import pymesh

rules = """
""".strip().splitlines()


def parse_rule(r: str):
    on, c = r.split(" ")
    on = on == "on"

    ranges = c.split(",")
    ranges = tuple([tuple(tuple(int(n) for n in g.split("=")[1].split(".."))) for g in ranges])

    return on, ranges

rules = [parse_rule(l) for l in rules]

def rule_to_csg(rule):
    _, (xr, yr, zr) = rule

    return pymesh.generate_box_mesh((xr[0], yr[0], zr[0]), (xr[1] + 1, yr[1] + 1, zr[1] + 1))

it = iter(rules)
initial = rule_to_csg(next(it))

for rule in it:
    mesh = rule_to_csg(rule)
    if mesh is None:
        continue
    if rule[0]:
        initial = pymesh.boolean(initial, mesh, operation="union", engine="igl")
    else:
        initial = pymesh.boolean(initial, mesh, operation="difference", engine="igl")

pymesh.save_mesh("lol.obj", initial)