ISO 10303-214:2010(E)
A Closed_shell is a collection of at least one Face object that bounds a region in a three-dimensional space. The topological normal of the shell is defined as being directed from the finite to the infinite region. A Closed_shell shall not self-intersect.
The data associated with a Closed_shell are the following:
shell_boundary
The shell_boundary specifies the Face that represents the boundary of a Closed_shell.
See closed_shell to face for the application assertion.
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