# Extrusion Body

Volumes can now also be created in the combination elements using the extrusion function.

* The coordinate system of the volume is defined by 3 points. This determines the orientation of the coordinate system. It is then shifted so that the volume lies in its first octant.
* Two further points define the start and end point of the extrusion. This specifies both the extrusion direction and the extrusion length.
* The outer and inner polygons are described by any number of segments:
  * Each segment is defined by 2 points. These points do not have to be the start and end points of the final segment.
  * The order of the points is also arbitrary.
  * It should only be noted that the points of the first segment and the second point of the second segment determine the winding direction of the polygon. This in turn determines the orientation of the positive radius for the circular arcs.
* If the segment is to be an arc, a radius other than 0.0 is entered. A positive radius creates a circular arc with positive winding direction. The circular arc is placed through the two points.
* All segments, regardless of whether they are lines or circular arcs, are automatically connected by the function.
  * The segments are connected according to their input order.
  * The segments may overlap or be far apart from one another. The function operates as if the plane-program function "*Fillet*" had been used to select the segment at its center.
  * If the radius "*Fillet*" is equal to 0.0, a corner is created. If this radius is greater than 0.0, the corner is tangentially rounded with a corresponding circular arc.
* The identifier "*END*" is assigned to the last segment of a polygon. The next segment then marks the start of the next polygon. The first polygon is automatically the outer polygon; all further polygons are inner polygons and therefore form openings in the volume.
* The generated extrusion bodies can be punched out like components with layer polygons.
* As with other components, extrusion bodies can be further processed in connections, point symbols, and special operations. They are referenced using the identifier E; E1 is therefore the first extrusion body.
* After creation, the extrusion body can be assigned any number of free MOS.
* The free MOS are specified simply as text; multiple entries are separated by a tilde \~.


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