Modul Oberfläche

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This documentation is not finished. Please help and contribute documentation.

Gui Command explains how tools should be documented. See Draft ShapeString for an example of a well documented tool. Browse Category:UnfinishedDocu/de to see incomplete pages like this one. See Category:Command Reference for all commands.

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Workbench Surface.svg


Die in FreeCAD 0.17 eingeführte Arbeitsbereich Oberfläche bietet Werkzeuge zum Erstellen und Ändern einfacher NURBS-Oberflächen. Diese Werkzeuge haben eine ähnliche Funktionalität wie das Werkzeug Part Formbauer, wenn die Option Fläche aus Kanten verwendet werden. Im Gegensatz zu diesem Werkzeug sind die Werkzeuge des Arbeitsbereichs Oberfläche jedoch parametrisch und bieten zusätzliche Optionen. In dieser Hinsicht ähneln die Werkzeuge in diesem Arbeitsbereich Funktionen wie PartDesign AdditiveLoft und PartDesign AdditivePipe.

Einige der angebotenen Funktionen sind:

  • Erzeugung von Flächen aus Begrenzungskanten.
  • Ausrichtung der Krümmung von benachbarten Flächen.
  • Beschränkung der Oberflächen auf zusätzliche Kurven und Ecken.
  • Verlängerung der Flächen.
  • Ein Netz kann als Vorlage verwendet werden, um Polynomzug Kurven auf seiner Oberfläche zu erstellen.

Surface example.png


The Surface Workbench intends to create faces with shapes, which is not possible to do with the standard tools in other workbenches. The OCCT kernel gives as example a rectangular box with a rounded corners of different radii.

Toy Duck.png

Surface created with sketches placed in datum planes with the tools of the PartDesign Workbench

The Surface Workbench integrates with other workbenches of FreeCAD. The above example was created from sketches placed on datum planes in the PartDesign Workbench. The design can be fully parametric, when all datum planes and sketches are defined accordingly. In most cases it is sufficient with drawing a closed sketch to define the border for a face; then options are available to further modify its shape.

The current state of FreeCAD (v0.17) does not allow to place the surfaces into a PartDesign Body. However, the surfaces can be placed inside of a Std Part container together with the PartDesign Body which holds all datum planes and sketches. The non parametric Part Shapebuilder tool must still be used in order to create a shell and a regular solid out of the set of surfaces.

Surface Tools

  • Filling.svg Filling...: fills a series of boundary curves with a surface. The surface can be modified by adding constraint curves and vertexes. The surface changes its shape so that the surface goes through the added constraint elements.
  • BSplineSurf.svg Fill boundary curves: creates a surface from two, three or four boundary edges. Three different filling modes are available: Stretch, Coons, Curved.

Additional Menu Tools

These tools are only found in the Surface menu.

  • Curve on mesh...: A selected mesh from the mesh workbench can serve as a template in order to create manually spline curves on it.
  • Extend face: Extrapolate the surface at the boundaries with its local u-parameter and v-parameter.

How to use


The used surface code from the CAD-kernel OCCT is very fragile and can not handle wrong input properly. This can cause FreeCAD to crash. The following situations cause problems and may crash FreeCAD:

  • adding additional edges or wires as boundary to a surface, that would make up several faces. Add those edges only to Unbound Edges.
  • Using of boundary edges, that fails do build a closed boundary at parametric changes of the document.