Note that the issue also affected animdata handling...
Checked all usages of the `BKE_libblock_copy_ex()` function, and
think never handling user count here is valid, although a bit risky
maybe. But other solution would be to add yet another copy flag, so
would rather go with that one for now.
The problem was that the object and collection pointers in Base and
LayerCollection would get lost of file read. Normally such ID pointers would
be resolved by pointing to an ID_ID placeholder which has the datablock name,
and then replacing it will the real datablock. However ID_ID is only written
for directly linked datablocks.
This adds the concept of an indirectly linked datablock with a weak reference
to it. For this we write an ID_ID_WEAK_REF code, which is a reference that
will only be resolved if the datablock was read for another reason.
Differential Revision: https://developer.blender.org/D4416
Another sneaky bite from the infamous private ID data: While those
monsters are not in bmain, the actions used by their animdata are
regular cute little ID's, living with the herd in the safe and sound
Main DB...
So we have to be careful not to propagate the nasty black magic
required to handle the formers when we duplicate their animdata.
Saying it again: private ID datablocks should never have had their own
animdata & actions, this is endless issue also with RNA paths... And
makes copying of animation between materials and such needlessly
complicated.
Private ID data (nodetrees and scene collections...) need special care
and handling of their copy flags, and checks must be adapted too.
In that case, issue came from the fact that even though those IDs have
to be copied outside of bmain, we may still require usercount handling.
That commit also fixes a somewhat related issue - we cannot use the
non-id private data copying flag for private IDs copying, due to
difference in handling of usercount again.
NodeTree structures of materials and some other data blocks are
effectively node group datablock objects that are contained inside
the parent block. Thus, direct references to them are only valid
while blender is running, and are lost on save.
Fix Copy As New Driver to create a reference that goes through
the owner datablock, by adding a new ID flag to mark private
pseudo-datablocks.
Also fix functions that return full paths to structures and
properties, e.g. used in python tooltips. Functions for paths
from ID to struct or property can't be changed because of
Animation Data related code.
Reviewers: mont29
Differential Revision: https://developer.blender.org/D5559
Previously settings were removed, now add to the rigid body world automatically
even if it's a bit ill defined, since this is confusing for users.
Fundamentally the concept of a rigid body world collection could be revised, and
left only as an optional thing.
Better to make internal code naming match official/UI naming to some
extent, this will reduce confusion in the future.
This is 'breaking' scripts and files that would use that feature, but
since it is not yet officially supported nor exposed in 2.80, as far
as that release is concerned, it is effectively
a 'no functional changes' commit.
This will be needed in undo/redo case, since we do not re-read linked
IDs, their usercounts become total garbage (especially in 'used by local
ID' cases)...
The goal is to prevent assignment of temporary or evaluated meshes
to objects from the main database.
Majority of the change is actually related on passing reports around.
On a positive side there are more error prints which can become more
visible to scripters.
There are still possible further improvements in the related areas.
For example, disable user counting for evaluated ID datablocks when
assignment happens. But can also happen later on as a separate
improvement.
Reviewers: brecht, campbellbarton, mont29
Reviewed By: brecht
Differential Revision: https://developer.blender.org/D4884
Versionning code generating collections from old 2.79 scene layers was
setting new collections' library from scene, but it also needs to
properly set the `LIB_TAG_INDIRECT` tag, otherwise localizing code does
not know what to do, and most of append process fails.
Am not sure whether we want to support that at some point, but at least
if we don’t, make it safe and get out of copy code early, previously
trying to duplicate workspace through BKE_id_copy() would have given a
very bad a broken result...
`id_single_user()` was still code from older ID management, now we can
use modern code to handle animdata duplication for us (which allows to
keep handling of nasty sub-data ID horrors like nodtrees in a single
place, much safer and simpler).
Convention was not to but after discussion on 918941483f we agree its
best to change the convention.
Names now mostly follow RNA.
Some exceptions:
- Use 'nodetrees' instead of 'nodegroups'
since the struct is called NodeTree.
- Use 'gpencils' instead of 'grease_pencil'
since 'gpencil' is a common abbreviation in the C code.
Other exceptions:
- Leave 'wm' as it's a list of one.
- Leave 'ipo' as is for versioning.
This problem existed in 2.79 as well. The rigid body setting is related
to the scene the object was created.
We now clear all the rigid body properties of the appended objects to
prevent them from lingering in this state where they have settings yet
cannot be used in the simulation.
Reviewers: mont29, brecht
Differential Revision: https://developer.blender.org/D4380
More or less same code was being executed twice during ID copying.
Makes no sense to add yet another switch-by-ID-type to handle
specificaly runtime data during ID copying, we already have
BKE_xxx_copy_data() functions for that.
This is a slightly more risky commit, as it is very difficult to fathom
all that may happen when localazing IDs. Would not expect any issue
though.
Note that a big TODO remain to refactor fully that ID localization
process (for 'shading IDs'), it's still doing pretty much same thing as
regular out-of-main copies, but the infamous ntree topic makes it
delicate to handle...
