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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.
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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.
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Figure 6-3 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.
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Figure 6-3. Body with Two Lumps
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Figure 6-4 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.
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Figure 6-4. Body with Solid Lump and Sheet Lump
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