Improves the use of the ShapeAppearance property for the Part workbench.
removes DiffuseColor property
adds Python compatibility using custom attributes
transitions DiffuseColor to ShapeAppearance on open
Improved UI elements for setting object appearance, and appearance per face
Lays the foundation for future texture support
The Materials module does a conversion from float to double when saving the transparency and again a conversion from double to float to double
when restoring it. This causes a considerable loss of accuracy so that the representation in percent leads to different numbers.
Using consistently some helper functions to do a proper conversion from float to long and back fixes the problem.
The new property ShapeAppearance is a PropertyMaterialList and always read after the DiffuseColor property when restoring a document.
Thus, the method onChanged() doesn't override DiffuseColor when restoring a document. Additionally, the method finishRestoring() is re-implemented
to set the colours per face in case DiffuseColor has defined multiple colors.
* Correctly load a file if colors are set per face
* Result of boolean operation is correctly colored if source objects have different colors
* Result of compound is correctly colored if source objects have different colors
* fix several linter warnings
* remove code that cannot be executed: inside the constructor it cannot ever happen that getObject()
returns a valid object
* in ViewProviderGeometryObject::handleChangedPropertyName call the method of the direct base class
as otherwise this may break the mechanism in the future
* Shape is a property of an extension module -> move its handling to ViewProviderPartExt
Uses new material system for appearance
Each feature object now has a property called ShapeMaterial that
describes its physical properties. If it has a shape, it has a
material.
The ShapeColor attribute is replaced by a ShapeAppearance attribute.
This is a material list that describes all appearance properties, not
just diffuse color. As a list in can be used for all elements of a
shape, such as edges and faces.
A new widget is provided to allow the user to select materials in a
consistent fashion. It can also launch the material editor with its
more advanced capabilities.
Some instances of TimeInfo serve the sole purpose of measuring time
duration. Using system time is unfortunate as it returns wall clock,
which is not guaranteed to be monotonic. Replace such a usage with
the new TimeElapsed class based on steady clock.
Problem description
To display a shape, the ViewProvider creates a mesh of the shape data. The
resolution depends also on the two parameters "Angular Deflection" and
"Deviation" in the View properties. (The values of these parameters are also
updated for all objects when changing these settings in the Preferences
dialog).
Changing the parameters from a high value to a lower value has an immediate
effect on the displayed shape -- for example a circle will be displayed finer
with more line segments. But changing the parameter back to the higher value
(with less resolution) will keep the finer view-mesh instead of calculating a
coarser one. To get back to the coarse view, the object has to be manually
recomputed or the file re-opened.
Solution
I just set the meshing parameter AllowQualityDecrease to True. I guess that
this was not implemented before because this parameter is quite new (introduced
in OCC v7.5 in the year 2020).
* Part: fix Placement/Shape onChanged() handling
* App: fix property ordering problem when undo/redo
See https://tracker.freecadweb.org/view.php?id=4265#c14271
* Gui: fix undo/redo signaling
Make sure to signal after all properties has been restored
