class openmc.Union(nodes)[source]

Union of two or more regions.

Instances of Union are generally created via the | operator applied to two instances of openmc.Region. This is illustrated in the following example:

>>> s1 = openmc.ZPlane(z0=0.0)
>>> s2 = openmc.Sphere(r=637.1e6)
>>> type(-s2 | +s1)
<class 'openmc.region.Union'>

Instances of this class behave like a mutable sequence, e.g., they can be indexed and have an append() method.


nodes (iterable of openmc.Region) – Regions to take the union of


bounding_box (openmc.BoundingBox) – Lower-left and upper-right coordinates of an axis-aligned bounding box

insert(index, value)[source]

S.insert(index, value) – insert value before index