Changes to the utils.py file to make Up3date compatible with Blender 5.1.1 and more robust

[herve-lg]

Hello,

I just used your add-ons in Blender 5.1.1. I had to modify your "core" > "utils.py" file in two places to be able to read my CityJSON file.

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1) On line 17, I had to replace

for custom_property in bpy.context.scene.world.keys():

which causes an error RuntimeError: IDPropertyGroup changed size during iteration

by

for custom_property in list(bpy.context.scene.world.keys):

Why? Blender 5.1.1 (and python) forbids from deleting certain custom properties one after another, without first creating a copy of the list. That’s what my new script does. The error then disappears.

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2) On line 48, I modified :

obj[".". join(prefix + [prop])] = value

that generates an error message KeyError: 'the length of IDProperty names is limited to 63 characters'

To integrate a mechanism for truncating names that are too long, here are the 2 lines that should replace line 48 (increment on the same level) :

full_name = ".". join(prefix + [prop])
obj[full_name[:63]] = value

Indeed, The CityJSON file I use has very long property names. The length of IDProperty’s names is an internal limitation of Blender that can hardly be changed.

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The two changes are intended to make the utils.py file more robust so that it can read a larger number of CityJSON file types.

In any case, well done for the job. Make sure to keep it tidy, it’s a great tool!