Lumps
A lump represents a bounded, connected region in space. A lump is an entire connected set of points, whether the set is 3D, 2D, 1D, or a combination of dimensions. Thus, a solid block with a dangling outside face is one lump, as is a solid block with an internal cavity. Two disconnected sheets are represented as two lumps.
A body contains zero or more lumps, each of which represents a set of points that are disjoint from those represented by all other lumps in the body.
The following figure illustrates a body with two solid lumps. The large block represents one solid lump that completely encloses a void (dotted line). The second lump (small block with solid lines) is completely enclosed in the void.
Figure. Body with Two Lumps
The following figure shows a body with a solid lump and a sheet lump. It is also possible to have solid and sheet regions within a single lump.
Figure. Body with Solid Lump and Sheet Lump
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