Surface GeomFillSurface/de

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Surface

Surface GeomFüllfläche

Menüeintrag
Surface → Begrenzungskurven füllen
Arbeitsbereich
Surface
Standardtastenkürzel
Keiner
Eingeführt in Version
0.17
Siehe auch
Keiner

Beschreibung

Surface GeomFüllfläche erstellt eine parametrische Oberfläche aus zwei, drei, oder vier Randkurven mit einem möglichst glatten Übergang zwischen ihnen.

Left: edges that are used to generate a surface with the GeomFillSurface tool, 4 connected edges, 3 connected edges, and 2 disconnected edges. Right: resulting surface from using the 4, 3, and 2 edges, respectively.

Anwendung

  1. There are several ways to invoke the tool:
    • Press the Fill Boundary Curves button.
    • Select the Surface → Fill Boundary Curves option from the menu.
  2. Select edges in the 3D view. The edges must connect together so that they formed a closed profile.
  3. Press OK.

Hinweis: einmal erzeugt, ist es nicht möglich, weitere Einschränkungen zur erzeugten Oberfläche hinzuzufügen.

Optionen

Fill type: Stretch, Coons oder Curved.

Eigenschaften

A Surface GeomFillSurface (Surface::GeomFillSurface class) is derived from the basic Part Feature (Part::Feature class, through the Part::Spline subclass), therefore it shares all the latter's properties.

Zusätzlich zu den in Part Formelement beschriebenen Eigenschaften, hat die Füllfläche im Eigenschaften Editor folgende Eigenschaften.

Daten

Basis

Ansicht

Basis

Verdrehung der Oberfläche

The shape of the surface depends on the direction of the chosen edges; if edges are selected and the result is a surface that "twists" on itself, one of the edges may need its list of vertices in the reverse order. A surface that twists on itself will probably have self-intersections, and thus will be an invalid Shape; this can be verified with Part CheckGeometry.

Zum Beispiel, wenn zwei Kurven die Punkte haben 

curve1 = [a, b, c, d]
curve2 = [e, f, g]

and the resulting surface after using GeomFillSurface or Sections is a twisted surface, you may create a third curve that is equal to one of the two original curves but with a reversed list of points.

Entweder 

curve1 = [a, b, c, d]
curve3 = [g, f, e]

oder 

curve3 = [d, c, b, a]
curve2 = [e, f, g]

sollte funktionieren, um eine Oberfläche zu erzeugen, die sich nicht verdreht.

In practical terms this means that all edges used to generate a surface should be created preferably in the same clockwise or anti-clockwise direction. Following this simple rule usually guarantees that the surface will follow the smoothest direction and won't twist.

When the surface's AnsichtLighting property is One side, a face will be painted completely black if its normal direction points into the 3D view (away from the current viewer), indicating a flipped face with respect to the other colored faces.

Left: the boundary edges are oriented in the same direction, and thus the generated surface is smooth. Right: the boundary edges have opposite directions, and thus the generated surface twists on itself, resulting in self-intersections.

Skripten

Siehe auch: Grundlagen der Skripterstellung in FreeCAD.

The Surface GeomFillSurface tool can be used in macros and from the Python console by adding the Surface::GeomFillSurface object. 

import FreeCAD as App
import Draft

doc = App.newDocument()

a = App.Vector(-140, -100, 0)
b = App.Vector(175, -108, 0)
c = App.Vector(200, 101, 0)
d = App.Vector(-135, 107, 70)

points1 = [a, App.Vector(-55, -91, 65), App.Vector(35, -85, -5), b]
obj1 = Draft.make_bspline(points1)

points2 = [b, App.Vector(217, -45, 55), App.Vector(217, 35, -15), c]
obj2 = Draft.make_bspline(points2)

points3 = [c, App.Vector(33, 121, 55), App.Vector(0, 91, 15), App.Vector(-80, 121, -40), d]
obj3 = Draft.make_bspline(points3)

points4 = [d, App.Vector(-140, 0, 45), a]
obj4 = Draft.make_bspline(points4)
doc.recompute()

surf = doc.addObject("Surface::GeomFillSurface", "Surface")
surf.BoundaryList = [(obj1, "Edge1"),
                     (obj2, "Edge1"),
                     (obj3, "Edge1"),
                     (obj4, "Edge1")]
doc.recompute()


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