[Bf-committers] De-referencing materials in mesh, bug?

[Campbell Barton]

Hi, I recently noticed an interesting thing.
When a mesh has no users then its looses the reference to its materials.

The result is that a mesh with no users cant have any materials. This is 
an interesting problem. If you think about it :).

This is a bug since making DATA have no users shouldent modify the data 
its self, especialy loose data.

Its actually causing a bug in a plugin Im writing. since all meshs need 
materials for exporting, and I only want to import an object once from 
an extarnal library.
So objects that are created from a mesh with no users immediatly loose 
all materials.

On the flip side, keeping a mesh with no users links to materials will 
make a material have links when it would look like it shouldent,. and 
also twice as many save/opens to dereference the material.

the F betton to make it have a fake user is okay, but dosent solve the 
problem, only a workaround and isnt accsessable from python.

WHats the Best solution?


Keep the meshes reference to the material, but still remove one user 
from the material.

If the mesh is used later on, then bump up the users of materials.  else 
they will both be de-allocated at once. so the mesh will never reference 
a materail that isnt there.

- Cam

BUG REPORT
https://projects.blender.org/tracker/index.php?func=detail&aid=2509&group_id=9&atid=125
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