OCC currently does not reliably enforce linear deflection on curved
surfaces, especially curved lofts over nurbs splines. To avoid surprises
when tight tolerances are needed, replace the static default angular
deflection of 0.5 radians (~28 degrees), with a more sensible angular
deflection derived from the provided linear deflection tolerance.
By adding the default heuristic to TopoShape, we can keep typical
tessellate() and STL export functionality users simple, and also avoid
the need to implement similar heuristics in many places. If more
explicit control over angular deflection is needed for some use cases,
then we could still choose to expose the option to override the derived
default explicitly.
The hope is that OCC's linear deflection enforcement will be more
reliable at some point, at which point this heuristic will no longer be
needed.
In the past it used the `Draft.calculatePlacementsOnPath` function
but this function was moved and modified when the `PathArray`
was improved. The `calculatePlacementsOnPath` function
was moved to `draftobjects.patharray`
and renamed `placements_on_path`.
This doesn't completely fix the Fence object because some other
modifications need to be done in the calculation of the paths.
- Add `CutPattern` feature, defaulting to `ZigZag`.
- Change inter-pass retractions to SafeHeight for multi-pass operations.
- Fix division by zero instance for particular Perpendicular use case.
- Synchronize property values with inputs in both the Property View and Tasks Editor windows.
- Change `LayerMode` default value to `Multi-pass`.
- Improve debug messaging.
- Consolidate code and remove unused code.
Path: fix exception thrown
+ avoid warning: QEventLoop: Cannot be used without QApplication
+ avoid warning: QObject::startTimer: Timers can only be used with threads started with QThread
