Blender Git Loki

Geometry Nodes: Do not realize instances in the material assign node

Only run the node once for every unique geometry set in the input's
instance heirarchy. This can massively improve performance when
there are many instances, but it will mean that the result is the same
for every instance. For the previous behavior, a "Realize Instances"
node can be used before this one.

This node can be changed without versioning since the old material
assign node was already deprecated and replaced.

Geometry Nodes: Move output attribute names to a subpanel

In a sub-panel it will be clearer that they are outputs, since they
just look like more inputs now. Unfortunately it is not possible to
make sub-panels display conditionally currently, so the output
sub-panel will always be visible whether or not it is empty.

Differential Revision: https://developer.blender.org/D12653

Cleanup: fix (harmless) uninitialized variable usage

Fix part of T91516: Cycles not rendering geometry nodes instances

Part of the fix is by Jacques. This fixes the most obvious case, but it's
still not clear how to deal with non-mesh geometry instances or how to handle
motion blur for such instances.

Constraints: change default Stretch To rotation type to Swing.

As also explained in D6134, in most case of Stretch To usage in
rigs, it is desirable to use swing rotation, either via the old
method of pairing the constraint with Damped Track, or via the
Swing rotation type introduced in 2.82. This is for instance true
for all usages of the constraint in Rigify.

The reason can be understood by realizing that unlike order-
dependent euler rotations, swing is not biased to an axis, and
isn't affected by gimbal lock effects at merely 90 degrees
of rotation (it has only one singularity at 180 degrees).

Thus it makes sense to change the default for newly created
constraints to the Swing mode. This has no backward compatibility
concerns except for old tutorials and rig generation scripts.

Differential Revision: https://developer.blender.org/D12643

Update RNA to user manual url mappings

File/Asset Browser: Don't deselect other items when dragging

Basically this enables the select-tweaking behavior as per the
guidelines:
https://wiki.blender.org/wiki/Human_Interface_Guidelines/Selection#Select-tweaking.

We use this in most other other editors that allow selecting and
dragging multiple items. But besides the consistency improvement, this
is important if we want to support dragging multiple assets (or files)
in future. We want to support this at least for dragging multiple assets
into an asset catalog for the upcoming asset catalog UI.

Cleanup: incorrect null check in asset library

Found by clang tidy (P2439).

Fix: Incorrect node socket name after recent refactor

Caused by rBc99cb814520480379

Geometry Nodes: Distribute points once per instance reference

With this commit, the distribute points on faces node runs only
once for every unique mesh in its input. That means if there are
100 instances of the same mesh, it will only run once.

This basically reverts rB84a4f2ae68d408301. The optimization there
didn't end up being worth it in the end, since it complicates code
quite a lot. It's also incompatible with this method of dealing with
instances, and it breaks field evaluation for instances, where we would
have to make sure to handle each instance transform properly otherwise,
evaluating the field separately for every instance.

Differential Revision: https://developer.blender.org/D12630

Cleanup: Asset catalogs, fix clang-tidy warning

Change `auto &catalog` to `const auto &catalog`.

No functional changes.

Asset Catalogs: write catalogs to disk when saving the blend file

The Asset Catalog Definition File is now saved whenever the blend file
is saved. The location of the CDF depends on where the blend file is
saved, and whether previously a CDF was already loaded, according to the
following rules. The first matching rule wins:

1. Already loaded a CDF from disk? -> Always write to that file.
2. The directory containing the blend file has a
`blender_assets.cats.txt` file? -> Merge with & write to that file.
3. The directory containing the blend file is part of an asset library,
as per the user's preferences? -> Merge with & write to
`${ASSET_LIBRARY_ROOT}/blender_assets.cats.txt`
4. Create a new file `blender_assets.cats.txt` next to the blend file.

BLI Path: add function `BLI_path_contains()`

Add function `BLI_path_contains(container, containee)` that returns true
if and only `container` contains `containee`.

Paths are normalised and converted to native path separators before
comparing. Relative paths are *not* made absolute, to simplify the
function call; if this is necessary the caller has to do this conversion
first.

BKE Preferences: find asset library containing a path

Add `BKE_preferences_asset_library_containing_path(&U, some_path)` that
finds the asset library that contains the given path.

This is a simple linear search, returning the first asset library that
matches. There is no smartness when it comes to nested asset libraries
(like returning the library with the best-matching path), although this
could be a useful feature to add later.

Fix T91691: Selecting "Remove unused slots" in Materials panel removes slots that are assigned to particle systems/hair.

`BKE_object_material_slot_used` would only check obdata usages, but
particle settings can also (weirdly enough) use objects' material slots.

So now, as its name suggests, `BKE_object_material_slot_used` does take
an object as parameter, and also checks for potential slot usage from
psys in the object.

Assets: Additions/fixes to the catalog system in preparation for the UI

* Fixes missing update of the catalog tree when adding catalogs.
* Adds iterators for the catalogs, needed for UI code.
* Store catalog ID in the catalog tree items, needed for UI code.
* Other smaller API additions for the UI.
* Improve comments and smaller cleanups.

New functions are covered with unit tests.

Differential Revision: https://developer.blender.org/D12618

Reviewed by: Sybren St�vel

Fix T91728: Cycles render artifacts with motion blur and object attributes

Geometry Nodes: add utility to process all instances separately

This adds a new `GeometrySet::modify_geometry_sets` method that can be
used to update each sub-geometry-set separately without making any
instances real.

Differential Revision: https://developer.blender.org/D12650

Cycles: Rework OptiX visibility flags handling

Before the visibility test against the visibility flags was performed in an any-hit program in OptiX
(called `__anyhit__kernel_optix_visibility_test`), which was using the `__prim_visibility` array.
This is not entirely correct however, since `__prim_visibility` is filled with the merged visibility
flags of all objects that reference that primitive, so if one object uses different visibility flags
than another object, but they both are instances of the same geometry, they would appear the same
way. The reason that the any-hit program was used rather than the OptiX instance visibility mask is
that the latter is currently limited to 8 bits only, which is not sufficient to contain all Cycles
visibility flags (12 bits).

To mostly fix the problem with multiple instances and different visibility flags, I changed things to
use the OptiX instance visibility mask for a subset of the Cycles visibility flags (`PATH_RAY_CAMERA`
to `PATH_RAY_VOLUME_SCATTER`, which fit into 8 bits) and only fall back to the visibility test any-hit
program if that isn't enough (e.g. the ray visibility mask exceeds 8 bits or when using the built-in
curves from OptiX, since the any-hit program is then also used to skip the curve endcaps).

This may also improve performance in some cases, since by default OptiX can now perform the normal
scene intersection trace calls entirely on RT cores without having to jump back to the SM on every
hit to execute the any-hit program.

Fixes T89801

Differential Revision: https://developer.blender.org/D12604

Fix two issues with recent new Append code.

* ID pointer returned by `wm_file_link_append_datablock_ex` was
improperly extracted from `WMLinkAppendDataItem` before append step.

* Code deleting linked IDs when their local matching version was re-used
did not properly clear `LIB_TAG_DOIT` beforehand.