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Sections

CurveOnMesh

Surface

Descrizione

Left: original face. Right: extended face.

Usage

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.

Options

This command doesn't have any options. Either it works with the selection or not.

Properties

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.

Data

Base

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

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

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

• DatiSampleU (IntegerConstraint): it defaults to 32.
• DatiSampleV (IntegerConstraint): it defaults to 32.

View

Base

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

Scripting

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()

Sections

CurveOnMesh

Surface