How can I set the F button for materials and textures to be always on, even when I create a new material?

I don't know Python and I don't have time to learn it, but I have found that there is a property use_fake_user that must be set True for materials.

The reason for asking is that I sometimes loose my unassigned materials when I play with multiple objects and multiple material nodes created on the fly.


1 Answer 1


You can use an app handler to set use_fake_user to True right before saving. The following addon does it for materials and textures:

bl_info = {
    "name": "Save unused Materials and Textures",
    "author": "CoDEmanX",
    "version": (1, 0, 0),
    "blender": (2, 63, 0),
    "location": "(none)",
    "description": "Enable fake user to rescue unused materials / textures automatically before saving",
    "warning": "Make sure this addon is enabled by default!",
    "category": "Material"}

import bpy
from bpy.app.handlers import persistent
from itertools import chain

def enable_fakeuser(scene):
    for datablock in chain(bpy.data.materials, bpy.data.textures):
        datablock.use_fake_user = True

def register():

def unregister():

if __name__ == "__main__":

Make sure this addon is really enabled (best make it enabled by default and do that whenever you update Blender).

  • 1
    $\begingroup$ Yes! I'd buy you a beer if you were in Bucharest :) $\endgroup$
    – user3444
    Commented May 11, 2014 at 14:57

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