File: pack-predicates.py

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# -*- encoding=utf-8 -*-
from yade.pack import *

s1 = inSphere((0, 0, 0), 1)
s2 = inSphere((0, 0, 1), 1)
# construct using explicit composition
s12 = PredicateUnion(s1, s2)
print(s12.aabb(), s12((0, 0, .5), 0))
# constuct the same predicate with operators
print((s1 | s2).aabb(), (s1 | s2)((0, 0, .5), 0))
# predicate difference: points in s1 and not in s2
print((s1 - s2).aabb())
print((s1 - s2)((0, 0, 1.5), 0))
print((s1 - s2)((0, 0, -0.5), 0))