Surface Filling

Description
creates a surface from a series of connected boundary edges. The curvature of the surface can be additionally controlled by non-boundary edges and vertices, and a support surface.

The base geometry can belong to curves created with the Draft Workbench or the Sketcher Workbench, but can also belong to solid objects such as those created with the Part Workbench or the PartDesign Workbench.



Usage

 * 1) Press the  button.
 * 2) The  task panel opens. See Options.
 * 3) Select two or more edges in the 3D view:
 * 4) * There is no need to press the button in the  section at this time.
 * 5) * The edges must be selected in consecutive order.
 * 6) * The edges must be connected, but the complete boundary need not be closed.
 * 7) * The complete boundary should not self-intersect.
 * 8) * For a 360° circular boundary two semicircular edges can be selected.
 * 9) A preview of the final shape will be shown once enough valid geometry has been selected.
 * 10) Optionally select a . See Example.
 * 11) Optionally select one or more.
 * 12) Optionally select one or more.
 * 13) Press  button.

Options

 * In the section a support surface and boundary edges can specified:
 * Press the button and select a face in the 3D view to add a support surface.
 * Click the Edit-cleartext.svg icon to remove the support surface.
 * Press the button once to start selecting boundary edges in the 3D view.
 * There are several ways to deselect boundary edges:
 * Press the button once to start deselecting edges in the 3D view.
 * Select an edge in the list and press.
 * Right-click an edge in the list and select from the context menu.


 * In the section non-boundary edges can be specified:
 * The selection options are similar to those for boundary edges.


 * In the  section non-boundary vertices can be specified:
 * The selection options are similar to those for boundary edges.


 * Press or the  button to abort the operation.

Example
The acts as an additional constraint for the surface. The following simple example will give you an idea how this works:


 * 1) In the Workbench_Part.svg Part Workbench create a Part_Cylinder.svgder and set its  to.
 * 2) Switch to the Workbench_Surface.svg Surface Workbench and press the  button.
 * 3) Select the two semi-circular edges and the two straight edges that connect them.
 * 4) The result matches the four boundary edges, but the inner shape is quite different from the cylindrical face.
 * 5) Edit the Surface object and for the  select the cylindrical face.
 * 6) The modified shape matches the cylindrical face pretty well.

Properties
A Surface Filling ( class) is derived from the basic Part Feature ( class, through the 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

 * : boundary edges; C0 is required for edges without a corresponding face.
 * : order of constraint on boundary faces;, , and are possible.
 * : unbound constraint edges; C0 is required for edges without a corresponding face.
 * : order of constraint on unbound faces;, , and are possible.
 * : free constraint on a face.
 * : order of constraint on free faces.
 * : constraint points on surface.
 * : initial surface to use.
 * : starting degree, it defaults to.
 * : number of points on an edge for constraint.
 * : number of iterations, it defaults to.
 * : it defaults to.
 * : 2D tolerance, it defaults to.
 * : 3D tolerance, it defaults to.
 * : G1 tolerance, it defaults to.
 * : G2 tolerance, it defaults to.
 * : maximum curve degree, it defaults to.
 * : maximum number of segments, it defaults to.
 * : maximum curve degree, it defaults to.
 * : maximum number of segments, it defaults to.

View

 * : it defaults to ; if set to, it will show an overlay with the control points of the surface.

Scripting
FreeCAD Scripting Basics.

The Surface Filling tool can be used in macros and from the Python console by adding the object.
 * The edges to be used to define the surface must be assigned as a LinkSubList to the property of the object.
 * Auxiliary edges and vertices must be assigned as a LinkSubLists to the and  properties of the object.
 * All objects with edges need to be computed before they can be used as input for the properties of the Filling object.