When exporting, there is an error: 'NoneType' object has no attribute 'predecessor'

[jbirtel]

Hi,

I just tried the add on for Blender 2.93 and I wanted to export the following map

first_infinity_like_map.zip.

When exporting, I received the following error:

Python: Traceback (most recent call last):
File ".config/blender/2.93/scripts/addons/blender-driving-scenario-creator/export.py", line 45, in execute
self.export_openscenario(context, self.directory)
File ".config/blender/2.93/scripts/addons/blender-driving-scenario-creator/export.py", line 223, in export_openscenario
if incoming_roads[k].predecessor:
AttributeError: 'NoneType' object has no attribute 'predecessor'

location: :-1

However, some folders were created (catalogs, models, scenegraph, xodr). But the xodr folder is empty, so I guess there is a problem with the OpenDrive file generation (would also match with 'predecessor' attribute I guess?)

Would be cool, if you could have a look at that, maybe try the blender file or say, what I did wrong. That would be awesome. :)

[johschmitz]

Hello Jonas, could you please try version 0.1.1? There was a known issue in 0.1.0 when a junction was not fully connected. You need to make sure that it has 4 roads connected. Use the snapping to make sure that they are really connected. You can also check the custom properties of each road and junction in the Blender GUI to see the predecessors and successors.

[jbirtel]

I already used the newest release and I guess it worked now. I created a new map and the error did not occur again, even though I am not 100% sure what is now different to before. I am also not sure if it was because of the junctions, but also does not matter, it worked now. Thank you!

[johschmitz]

There's a slight change in the datamodel so it was actually a good idea to start with a new map from scratch. Try placing a non-fully connected junction and then export. Now with 0.1.1 there should be an error message telling you that you did that instead of the Python code crashing under the hood.

[jbirtel]

Yes, that's correct. I deleted a connection of the junction and there was a message 'Junction is not fully connected ' or something like that :)