represents an instance of a TetGen object.
- To use TetGenExpression, you first need to load it using Needs["TetGenLink`"].
- A TetGenExpression is used to make calls to TetGen.
- A TetGenExpression is returned by functions such as TetGenCreate and TetGenTetrahedralize.
- The resources of a TetGenExpression will be collected when you call TetGenDelete.