Blender Git Loki

Batch previews: improve speed of preview generation.

Force multi-threading of preview renders by setting appropriate tile
sizes (by default it would typically render on one or two threads only).

Fix T81218: Crash in pose mode using a driver on bendy bone Segment

The example file in T81218 has a driver that maps a bone's X-location to the number of BBone segments. This caused a dependency cycle, which resulted in bad thread serialisation, which caused the crash.

This patch breaks the dependency cycle `BONE_LOCAL` ? `DRIVER(bones["Bone"].bbone_segments)` ? `BONE_LOCAL`. The 'Driver Data' relation now points to `BONE_SEGMENTS` when the driven property starts with `bbone_`.

Differential Revision: https://developer.blender.org/D9122

VSE: Fix audio strips

When sequencer was moved from kernel, the DEFINES based on audaspace
were not moved along.

That means users had no way of creating new audio strips since
BKE_sequencer_add_sound_strip was ifdef'out

Cleanup: Depsgraph, reduce nesting of driver relations code

Reduce nesting of `DepsgraphRelationBuilder::build_driver_data()` by
flipping conditions and `return`/`continue` early.

No functional changes.

BLI: escape double quotes in dot export

Merge branch 'master' into soc-2020-io-performance

UI messages fixes...

Fix T81459: Memory Leak Cycles Rendered Viewport

The external engine in the draw manager wasn't registered correctly.
This did not free the resources after the external engine was used.

run clang format

fix crash setting particle systems on objects

correct socket UI name

cleanup, remove Film::tag_update

fix for missing motion steps

Merge branch 'master' into cycles_procedural_api

Fix T81470: Buttons in closed panel visible during search

The buttons hide when the search finishes based on whether they are in
the "panel header" group. These buttons were not protected with a new
group. This adds a new group for operator button calls, and also makes
it so a new group is always created after the header buttons.

API Doc Gen: Do not ignore objects file

This is used by the Blender manual or other sphinx website that would
like to link to Blender's API documentation.

UI: Changes to Viewport Display UI of Volume Object and Fluid

- Density, interpolation and slicing options in Volume Object's
Viewport Display are now not aligned to each other as they are not
closely related.
- Changed the enum property for slicing ('Method') to a boolean
property 'Slice' and added a sub-panel for slicing options under
the 'Viewport Display' panel in Volume Object and Fluid for better
clarity.
- Renamed `axis_slice_method` to `use_slice` in the python API for
Volume Object and Fluid.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D9097

Sculpt: Remove mask datalayer after extracting the object

When extracting a mask, the new object is going to have the same mask on
the same vertices, so it can't be sculpted without clearing the mask
first. It makes more sense to delete the mask datalayer from the new
object.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D9070

Fix T81343: Smooth shading normals not updating with line project tool

Just a missing update flag

Reviewed By: mont29

Maniphest Tasks: T81343

Differential Revision: https://developer.blender.org/D9077

Sculpt: Modify damping using the simulation factor of the cloth brush

This helps blending artifacts with dynamic simulation areas as the
damping increases when the vertex.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D9084