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Bastien Montagne 13bcb000fa Fix broken pointcache on disk in some cases. ...

Root of the issue is that point caches are added to the object's list
on-demand, which often ends up with them being added only during
depsgraph evaluation, i.e. on COW objects.

This could result in having 'orig' data caches with invalid/unset stack
index at some points (e.g. when reading a file and applying
liboverrides), leading to discarding valid existing disk cache files.
Fact that one of those index is signed, and the other not, does not
help...

While this is very weak, fixing broken PointCache code is out of the
scope of a bug fix, so this patch merely:
* Simplifies and factorizes the code generating the 'extension' part of
  caches filenames;
* Ensures `BKE_object_insert_ptcache` is called when needed so that we
  always have a valid stack index to generate that filename extension.

This is only a bandaid, but it is simple and should be safe enough for
now.

Related to T82503.

2020-11-16 14:39:31 +01:00

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