Bodies
Bodies are the highest level entities in ACIS models. Typically, a body is a single solid or sheet component, such as a washer, a stripped-down engine block, a zero thickness plate, or a cross section. A body can also be several disjoint bodies treated as one. A transformation recorded with the body relates the local coordinate system of the wires and lumps to the global coordinate space of the body.
Bodies "own" any number of lumps: zero, one, or more. The following figure shows an example of a body with more than one lump. When a square block (solid lines) is cleared by a cylinder (dashed lines) whose diameter is slightly larger than the length of a side of the block, the block is separated into four lumps. Although the four lumps are not physically joined, they are still treated as a single body.
Figure. Body with Four Lumps
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