If you sweep an open profile along a complete 2D loop, what type of body is created?

When you sweep an open profile along a complete 2D loop, it creates a solid body. The key concept here is that a complete 2D loop implies that the profile will traverse a defined path and ultimately enclose a volume. In solid modeling, creating a 3D object typically involves forming a closed surface that bounds a volume, and sweeping an open profile along a closed path achieves exactly that.

The nature of the sweep means that it will generate a continuous surface that eventually connects back to the starting point, thereby enclosing a volume, qualifying it as a solid body. Solid bodies are fundamental in CAD modeling when defining parts that have mass and volume, allowing for further operations, like boolean operations or physical simulations.

In contrast, a sheet body, which is another form of geometric entity, consists of only two dimensions (length and width), meaning it has no thickness and does not enclose a volume. The other types of bodies listed, like facet and convergent bodies, relate to different modeling strategies and representations that do not directly imply the creation of a solid through a complete sweep in the same manner as described.