Create a field out of x, y, and z coordinate functions.

Input parameters:

1. Fx → Vector field component in the world X direction.
2. Fy → Vector field component in the world Y direction.
3. Fz → Vector field component in the world Z direction.
4. Sc → If true, the component functions are added together to yield a scalar field. If false, the component functions encode the $(x,y,z)$ values of a vector field.
   •  True → Scalar
   • False → Vector

Output parameters:

1. Fl → Cartesian function field.