[Bug] DiffuseColor not properly applied to Part::FeaturePython objects

[Roy-043]

Is there an existing issue for this?

• I have searched the existing issues

Forums discussion

https://forum.freecad.org/viewtopic.php?p=656201#p656201

Version

0.21 (Development)

Full version info

OS: Windows 8.1 Version 6.3 (Build 9600)
Word size of FreeCAD: 64-bit
Version: 0.21.0.31709 (Git)
Build type: Release
Branch: master
Hash: e188802ca6997d2564e7570ab648462e6a059f87
Python 3.10.8, Qt 5.15.6, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.3
Locale: Dutch/Netherlands (nl_NL)
Installed mods:

Subproject(s) affected?

Part

Issue description

Part::FeaturePython objects do not display the DiffuseColor assigned via Python code. You have to use a workaround to update the ViewObject.

1. Paste the code below in the Python console.
2. Notice that the box does not show the DiffuseColor.
3. Workaround: paste my_box.ViewObject.DiffuseColor = my_box.ViewObject.DiffuseColor in the Python console.

# Code based on https://wiki.freecad.org/Create_a_FeaturePython_object_part_II

import FreeCAD as App
import Part

def create(obj_name):
    obj = App.ActiveDocument.addObject('Part::FeaturePython', obj_name)
    box(obj)
    ViewProviderBox(obj.ViewObject)
    obj.ViewObject.DiffuseColor = [(1.0, 0.0, 0.0, 0.0),
                                   (0.0, 1.0, 0.0, 0.0),
                                   (0.0, 0.0, 1.0, 0.0),
                                   (1.0, 1.0, 0.0, 0.0),
                                   (0.0, 1.0, 1.0, 0.0),
                                   (1.0, 0.0, 1.0, 0.0)]
    App.ActiveDocument.recompute()
    return obj

class box():

    def __init__(self, obj):
        obj.Proxy = self
        obj.addProperty('App::PropertyString', 'Description', 'Base', 'Box description').Description = ""
        obj.addProperty('App::PropertyLength', 'Length', 'Dimensions', 'Box length').Length = 10.0
        obj.addProperty('App::PropertyLength', 'Width', 'Dimensions', 'Box width').Width = 10.0
        obj.addProperty('App::PropertyLength', 'Height', 'Dimensions', 'Box height').Height = 10.0

    def execute(self, obj):
        obj.Shape = Part.makeBox(obj.Length, obj.Width, obj.Height)

class ViewProviderBox:

    def __init__(self, obj):
        obj.Proxy = self

    def getDefaultDisplayMode(self):
        return "Flat Lines"

my_box = create("my_box")

# my_box.ViewObject.DiffuseColor = my_box.ViewObject.DiffuseColor

Anything else?

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[Roy-043]

This problem is probably related to #8016. When the DiffuseColor is applied the object still has a null shape and therefore fewer faces than the length of the DiffuseColor list.

[Roy-043]

This issue has meanwhile been fixed.

OS: Windows 8 build 9600
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.35554 (Git)
Build type: Release
Branch: main
Hash: 8e2ab9f76888ac4da971f9d5069cec7bcc2b572f
Python 3.10.13, Qt 5.15.8, Coin 4.0.2, Vtk 9.2.6, OCC 7.6.3
Locale: Dutch/Netherlands (nl_NL)
Installed mods: