Surface ExtendFace

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Revision as of 23:48, 30 September 2020 by Vocx (talk | contribs) (→‎Data: Properties)
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Surface ExtendFace

Menu location
Surface → Extend face
Workbenches
Surface
Default shortcut
None
Introduced in version
0.17
See also
None

Description

Surface ExtendFace extrapolates an existing face or surface at its boundaries with its local U and V parameters.

File:Surface Extend example.png

Left: original surface. Right: extended surface.

Usage

  1. Make sure you have a face or surface.
  2. Select the existing surface, then Surface → Extend face.

Options

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

Properties

A Surface ExtendFace (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

  • DataFace (LinkSub): the subelement from an object that will be extended.
  • DataTolerance (FloatConstraint): it defaults to 0.1.
  • DataExtend UNeg (FloatConstraint): it defaults to 0.05.
  • DataExtend UPos (FloatConstraint): it defaults to 0.05.
  • DataExtend USymetric (Bool): it defaults to true, in which case DataExtend UNeg and DataExtend UPos will have the same value.
  • DataExtend VNeg (FloatConstraint): it defaults to 0.05.
  • DataExtend VPos (FloatConstraint): it defaults to 0.05.
  • DataExtend VSymetric (Bool): it defaults to true, in which case DataExtend VNeg and DataExtend VPos will have the same value.
  • DataSampleU (IntegerConstraint): it defaults to 32.
  • DataSampleV (IntegerConstraint): it defaults to 32.

View

Base

  • ViewControl 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.
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)

points1 = [a, App.Vector(-20, -8, 0), App.Vector(-17, 7, 0), b]
obj1 = Draft.make_bspline(points1)

points2 = [b, App.Vector(0, 25, 0), c]
obj2 = Draft.make_bspline(points2)

points3 = [c, App.Vector(37, 4, 0), d]
obj3 = Draft.make_bspline(points3)

points4 = [d, App.Vector(-2, -18, 0), a]
obj4 = Draft.make_bspline(points4)
doc.recompute()

surf = doc.addObject("Surface::Filling", "Surface")
surf.BoundaryEdges = [(obj1, "Edge1"),
                      (obj2, "Edge1"),
                      (obj3, "Edge1"),
                      (obj4, "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()

# ---------------------------------------------------------