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The Concept of Body and Topology

You need to understand the concept of body and topology for the modeling.

The model consists of bodies.

There are 4 types of bodies.

Body Types	Examples	Notes
Vertex body		It is a body of point.
Wire body		It is a body consisting of lines and/or curves. The perimeter of a circle is a wire body, too.
Sheet body		It is a body having the area, e.g. rectangles, polygons, circles, etc.
Solid body		It is a body having the volume, e.g. cubes, polyhedrons, spheres, cylinders, etc.

Topologies constitute a body.

For example, a cubic solid body has 6 face topologies.

There are 3 types of topologies.

The body and the topology are different as explained below.

Body	It can exist independently. The material property and the body attribute are set on body.
Topology	It is a shaping component of body. It cannot exist independently. Boundary conditions are set on topologies.

The body types and the associated topologies are listed below.

Body Types	Associated Topologies
Vertex body	Vertex topology
Wire body	Vertex topology Edge topology
Sheet body	Vertex topology Edge topology Face topology
Solid body	Vertex topology Edge topology Face topology