Shapes

Shapes are geometric objects that enables one to locate positions in- or out-side a given shape.

Shapes are constructed from basic geometric shapes, such as cubes, ellipsoids and spheres, and they enable any _set_ operation on them, intersection (A & B), union (A | B), disjunction (A ^ B) or complementary (A - B).

All shapes in sisl allows one to perform arithmetic on them. I.e. one may add two shapes to accomblish what would be equivalent to an & operation. The resulting shape will be a CompositeShape which implements the necessary routines to ensure correct operation.

Shape([center])	Baseclass for all shapes.
Cuboid(v[, center, origin])	A cuboid/rectangular prism (P4)
Cube(side[, center, origin])	3D Cube with equal sides
Ellipsoid(v[, center])	3D Ellipsoid shape
Sphere(radius[, center])	3D Sphere
NullShape(*args, **kwargs)	A unique shape which has no well-defined spatial volume or center