Donate

Querschnitte

KurveAufNetz

Surface

Beschreibung

Surface FlächeErweitern extrapoliert eine vorhandene Fläche oder Oberfläche an ihren Rändern mit ihren lokalen U- und V-Parametern.

Links: Original Fläche. Rechts: Erweiterte Fläche.

Anwendung

1. Make sure you have an object that has faces. The object could be created with the Surface Workbench but it could also be any other object, for example, created with Part or PartDesign.
2. Select the face to extend by clicking on it on the 3D view.
3. Press Extend face.

Optionen

Dieser Befehl besitzt keine Optionen. Entweder funktioniert er mit der Auswahl oder nicht.

Eigenschaften

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

In addition to the properties described in Part Feature, the Surface Filling has the following properties in the property editor.

Daten

Base

• DatenFace (LinkSub): the subelement from an object that will be extended; it must be a face.
• DatenTolerance (FloatConstraint): it defaults to 0.1.

• DatenExtend UNeg (FloatConstraint): it defaults to 0.05. The ratio of the local U parameter that will be extended in the negative direction.
• DatenExtend UPos (FloatConstraint): it defaults to 0.05. The ratio of the local U parameter that will be extended in the positive direction.
• DatenExtend USymetric (Bool): it defaults to true, in which case DatenExtend UNeg and DatenExtend UPos will have the same value.

• DatenExtend VNeg (FloatConstraint): it defaults to 0.05. The ratio of the local V that will be extended in the negative direction.
• DatenExtend VPos (FloatConstraint): it defaults to 0.05. The ratio of the local V direction that will be extended in the positive direction.
• DatenExtend VSymetric (Bool): it defaults to true, in which case DatenExtend VNeg and DatenExtend VPos will have the same value.

• DatenSampleU (IntegerConstraint): it defaults to 32.
• DatenSampleV (IntegerConstraint): it defaults to 32.

Ansicht

Base

• AnsichtControl Points (Bool): it defaults to false; if set to true, it will show an overlay with the control points of the surface.

Skripten

See also: FreeCAD Scripting Basics.

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

• The face to extend must be assigned as a LinkSub to the Face property of the object. It must contain only a single face.

import FreeCAD as App
import Draft

doc = App.newDocument()

a = App.Vector(-20, -20, 0)
b = App.Vector(-18, 25, 0)
c = App.Vector(60, 26, 0)
d = App.Vector(33, -20, 0)

points = [a, App.Vector(-20, -8, 0), b, c,
          App.Vector(37, 4, 0), d,
          App.Vector(-2, -18, 0), a]
obj = Draft.make_bspline(points)
doc.recompute()

if App.GuiUp:
    obj.ViewObject.Visibility = False

surf = doc.addObject("Surface::Filling", "Surface")
surf.BoundaryEdges = [(obj, "Edge1")]
doc.recompute()

# ---------------------------------------------------------
points_spl = [App.Vector(-10, 0, 2),
              App.Vector(4, 0, 7),
              App.Vector(18, 0, -5),
              App.Vector(25, 0, 0),
              App.Vector(30, 0, 0)]
aux_edge = Draft.make_bspline(points_spl)
doc.recompute()

surf.UnboundEdges = [(aux_edge, "Edge1")]
doc.recompute()

# ---------------------------------------------------------
surf_extended = doc.addObject("Surface::Extend", "Surface")
surf_extended.Face = [surf, "Face1"]
doc.recompute()

Querschnitte

KurveAufNetz

Surface