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Add example of using union operator on half-spaces

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Paul Romano 2020-04-13 14:43:00 -05:00
parent 3e4fc5877b
commit be46e6b603
1 changed files with 13 additions and 0 deletions
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docs/source/usersguide/geometry.rst
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@ -113,6 +113,19 @@ Boolean operators ``&`` (intersection), ``|`` (union), and ``~`` (complement)::
>>> type(northern_hemisphere)
<class 'openmc.region.Intersection'>
The ``&`` operator can be thought of as a logical AND, the ``|`` operator as a
logical OR, and the ``~`` operator as a logical NOT. Thus, if you wanted to
create a region that consists of the space for which :math:`-4 < z < -3` or
:math:`3 < z < 4`, a union could be used::
>>> region_bottom = +openmc.ZPlane(-4) & -openmc.ZPlane(-3)
>>> region_top = +openmc.ZPlane(3) & -openmc.ZPlane(4)
>>> combined_region = region_bottom | region_top
Half-spaces and the objects resulting from taking the intersection, union,
and/or complement or half-spaces are all considered *regions* that can be
assigned to :ref:`cells <usersguide_cells>`.
For many regions, a bounding-box can be determined automatically::
>>> northern_hemisphere.bounding_box