Wrong color is shown in 3D View when using "default" color

[mgg4]

Version

slic3r 1.42.0-alpha4+win64
slic3r 1.42.0-alpha5+win64

Operating system type + version

Windows 10

3D printer brand / version + firmware version (if known)

Prusa i3 MK3 (3.51.1-1778)
Prusa MMU2 (1.0.3-212)

Behavior

When changing extruders in the parts tree, the extruder color is not properly shown in the 3D view in some cases.

Scenario 1

• The "default" extruder is left unchanged on the parent in the parts tree.
• The individual parts are set to the desired extruder number directly.
• RESULT: The parts on the 3D view are shown with the correct colors assigned to each extruder. This is the expected behavior. If sliced, the proper extruder color is used and displayed in the Layer Preview.

Scenario 2

• The "default" extruder on the parent part is set to the extruder number for the majority of the parts.
• Those parts that should be the default color have their extruder set to "default".
• Other parts are set to the desired extruder number.
• RESULT: The parts that should be shown in the desired default color are instead shown with the color assigned to extruder 1, irrespective of what extruder was actually selected for the "default". This behavior is undesired. If sliced, the proper extruder color is used and displayed in the Layer Preview.

Expected Behavior

The color of the default extruder set in the parent part should be properly displayed in all views for child parts marked to use that default color.

This is not a new feature request. This is a report of a malfunction of the software.

Project File (.3MF) where problem occurs

Example Project.zip

[mgg4]

Verified this problem still persists in Alpha 5.

[enricoturri1966]

Working on it -> http://dev.prusa3d.com/browse/SPE-811

[FidelCapo]

This issue should be fixed in next release. Closing