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Given a datablock foo, how do I determine which other datablocks are referencing it? foo.users will tell me how many references there are, but do I have to loop through every other datablock in the file to find those references? If so, can anyone recommend a reasonably generic way of doing this given the different interfaces of various datablock types?

For my specific application I'm trying to find and delete (or modify) datablocks with names matching a pattern. I'm mostly interested in node groups and images, which seem to acquire hidden users more easily than other objects, but this type of functionality seems generally useful.

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There is no way, internally Blender also doesn't store this data for easy access.

However some data types have convenience properties added to them to access some of the users.

  • Object.users_scene
  • Object.users_group
  • Object.children

Are handy in many cases, but specific to object types.

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  • $\begingroup$ This is further complicated by the fact that you can't assume the same type of user for a particular datablock (e.g. an image could be used by both a texture as well as a compositor node). $\endgroup$
    – Fweeb
    Commented Sep 9, 2013 at 5:06

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