Difference between revisions of "Surface Workbench/fr"

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The '''Surface''' workbench provides tools to create and modify surfaces. It has a very similar functionality as [[Part_Shapebuilder|Part Shape builder]] ''Face from edges'', but it is parametric and provides additional options. Its features are:
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L'atelier '''Surface''' fournit des outils pour créer et modifier des surfaces. Il a une fonctionnalité très similaire à celle de [[Part_Shapebuilder/fr|Part Shape builder]] '' Face à partir d'arêtes '', mais il est paramétrique et fournit des options supplémentaires. Ses caractéristiques sont:
* Create surfaces from boundary edges
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* Créer des surfaces à partir des bords
* Align the curvature from neighbor faces
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* Aligner la courbure des faces voisines
* constrain surfaces to additional curves or vertexes.
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* Contraindre les surfaces à des courbes ou des sommets supplémentaires.
* extend faces (need to find out how!)
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* Étendre les faces (besoin de savoir comment!)
* A mesh can be used as a template to create spline curves on its surface.
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* Un maillage peut être utilisé comme modèle pour créer des courbes splines sur sa surface.
  
 
{{Version|0.17}}
 
{{Version|0.17}}

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L'atelier Surface fournit des outils pour créer et modifier des surfaces. Il a une fonctionnalité très similaire à celle de Part Shape builder Face à partir d'arêtes , mais il est paramétrique et fournit des options supplémentaires. Ses caractéristiques sont:

  • Créer des surfaces à partir des bords
  • Aligner la courbure des faces voisines
  • Contraindre les surfaces à des courbes ou des sommets supplémentaires.
  • Étendre les faces (besoin de savoir comment!)
  • Un maillage peut être utilisé comme modèle pour créer des courbes splines sur sa surface.

introduced in version 0.17

Introduction

The aim of the surface workbench is to create faces with shapes, which are not available with the standard tools in the other workbenches. The Open Cascade CAD-kernel gives as example a rounded corner of a rectangular box with different radii at the edges. Another example is shown here. It is the form of a plastic toy, created with the surface workbench.

Toy Duck.png The surface workbench generates usually nurb surfaces. The uses does not need to know much about nurbs(correct?). It is sufficient to have a closed border for a face, in order to create the surface. Options are available to further modify its shape.

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.

The current state of FreeCAD (v0.17) does not allow to place the surfaces into a body of the PartDesign workbench. But the surfaces can be placed inside of a Part together with the body which holds all datum planes and sketches. The non parametric Part Shape builder 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

Limitations

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.