Get the number of dof (degree of freedom) of the model
Returns number
setHalfSpace
setHalfSpace(b: boolean): void
brief
Set the model to in half-space or whole-space. By default the model is
in whole-space.
An explanation of whole-space versus half-space is given by the following figure
A Arch model comprises a set of active objects (Surface discontinuities), a [[Material]] and a set of Remotes.