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I will appreciate for your help. I am creating my material library, and trying to clean and rename all materials and nodegroups. How i can define from outliner (or any enother way) wich materials use this nodegroups

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Thank you for your help. I'll try to be more specific. Just for example. I have big scene with 105 materials, Also I have unknown node group (x) which is used by 3 users. It means that 3 materials from all 105 use this node group (x) The question is, how i can easily find these 3 materials? Where this information is shown in outliner? enter image description here Thank you

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  • $\begingroup$ Could you clarify? I don't think there is an easy way to select by node group. $\endgroup$ – Mörkö Mar 7 '16 at 8:46
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Node Groups can be renamed either in the Properties of the Node Editor, or also in the Outliner by editing the 'Name' attribute:

Editing a node group name

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How to find which are the users of some datablock (it doesn't matter if it is a material or group, the idea is the same):

The datablock itself does not store who the users are, instead you have to go over all the users and test. See:
How to know which object is using a material
Display all users of a datablock

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