openmc.Halfspace¶
- class openmc.Halfspace(surface, side)[source]¶
A positive or negative half-space region.
A half-space is either of the two parts into which a two-dimension surface divides the three-dimensional Euclidean space. If the equation of the surface is \(f(x,y,z) = 0\), the region for which \(f(x,y,z) < 0\) is referred to as the negative half-space and the region for which \(f(x,y,z) > 0\) is referred to as the positive half-space.
Instances of Halfspace are generally not instantiated directly. Rather, they can be created from an existing Surface through the __neg__ and __pos__ operators, as the following example demonstrates:
>>> sphere = openmc.Sphere(surface_id=1, r=10.0) >>> inside_sphere = -sphere >>> outside_sphere = +sphere >>> type(inside_sphere) <class 'openmc.surface.Halfspace'>
- Parameters
surface (openmc.Surface) – Surface which divides Euclidean space.
side ({'+', '-'}) – Indicates whether the positive or negative half-space is used.
- Variables
surface (openmc.Surface) – Surface which divides Euclidean space.
side ({'+', '-'}) – Indicates whether the positive or negative half-space is used.
bounding_box (tuple of numpy.ndarray) – Lower-left and upper-right coordinates of an axis-aligned bounding box
- clone(memo=None)[source]¶
Create a copy of this halfspace, with a cloned surface with a unique ID.
- get_surfaces(surfaces=None)[source]¶
Returns the surface that this is a halfspace of.
- Parameters
surfaces (collections.OrderedDict, optional) – Dictionary mapping surface IDs to
openmc.Surface
instances- Returns
surfaces – Dictionary mapping surface IDs to
openmc.Surface
instances- Return type
- remove_redundant_surfaces(redundant_surfaces)[source]¶
Recursively remove all redundant surfaces referenced by this region
- Parameters
redundant_surfaces (dict) – Dictionary mapping redundant surface IDs to surface IDs for the
openmc.Surface
instances that should replace them.
- rotate(rotation, pivot=(0.0, 0.0, 0.0), order='xyz', inplace=False, memo=None)[source]¶
Rotate surface by angles provided or by applying matrix directly.
New in version 0.12.
- Parameters
rotation (3-tuple of float, or 3x3 iterable) – A 3-tuple of angles \((\phi, \theta, \psi)\) in degrees where the first element is the rotation about the x-axis in the fixed laboratory frame, the second element is the rotation about the y-axis in the fixed laboratory frame, and the third element is the rotation about the z-axis in the fixed laboratory frame. The rotations are active rotations. Additionally a 3x3 rotation matrix can be specified directly either as a nested iterable or array.
pivot (iterable of float, optional) – (x, y, z) coordinates for the point to rotate about. Defaults to (0., 0., 0.)
order (str, optional) – A string of ‘x’, ‘y’, and ‘z’ in some order specifying which rotation to perform first, second, and third. Defaults to ‘xyz’ which means, the rotation by angle \(\phi\) about x will be applied first, followed by \(\theta\) about y and then \(\psi\) about z. This corresponds to an x-y-z extrinsic rotation as well as a z-y’-x’’ intrinsic rotation using Tait-Bryan angles \((\phi, \theta, \psi)\).
inplace (boolean) – Whether or not to return a new instance of Surface or to modify the coefficients of this Surface in place. Defaults to False.
- Returns
Translated half-space
- Return type