AddPolygon
==========
```{function}  AddPolygon( CSX, materialname, prio, normDir, elevation, points, varargin)
```
Full definition:
```{code-block} matlab
CSX = AddPolygon( CSX, materialname, prio, normDir, elevation, points, varargin)
```

- CSX:          CSX-object created by InitCSX()
- materialname: created by AddMetal() or AddMaterial()
- prio:         priority
- normDir:      normal direction of the polygon,
                e.g. 'x', 'y' or 'z', or numeric 0..2
- elevation:    position of the polygon plane
- points:       two-dimensional coordinates

Warning: Polygon has to be defined using Cartesian Coords
         for use with cylindrical mesh, set 'CoordSystem',0

example:

    p(1,1) = 0;  % x-coord point 1
    p(2,1) = 0;  % y-coord point 1
    p(1,2) = 10; % x-coord point 2
    p(2,2) = 20; % y-coord point 2
    % normal direction: z (2)
    CSX = AddPolygon( CSX, 'PEC', 1, 'z', 254, p, 'CoordSystem',0)


(c) 2011 Thorsten Liebig <thorsten.liebig@gmx.de>
(c) 2010 Sebastian Held <sebastian.held@gmx.de>

See also InitCSX AddMetal AddMaterial AddLinPoly AddRotPoly