From FreeCAD Documentation
- Make sure the objects are closed and planar, and do not self-intersect.
- To close a Draft Wire, a Draft BSpline, a Draft CubicBezCurve or a Draft BezCurve set its DataClosed property to
true.
- To close a Draft Circle or a Draft Ellipse set its DataFirst Angle and DataLast Angle properties to the same value.
- Select the objects.
- Switch to the View tab of the Property editor.
- The ViewDisplay Mode must be set to
Flat Lines.
- Select a ViewPattern.
- Optionally change the ViewPattern Size. Note that a higher value results in a denser pattern.
- The pattern is not displayed when the objects are selected. Deselect them to check the result.
- Optionally reselect the objects to change the pattern properties.