Blender Git Loki

Fix crash starting Blender with Python 3.9

In 3.8 and older the class held a reference to methods,
this is no longer the case in 3.9.

Fix T81686: Confusing add menu in pose mode

Cleanup: multi-line comment blocks

Cleanup: commented includes

Fix T81511: Loop-cut overlay doesn't follow deformed cage

With constructive + deform modifiers, loop-cut visualization
wasn't following the displayed mesh.

This now gets the coordinates from the cage when available.

Cleanup: spelling

edge collapse mostly works. need to track down more memory corruption
bugs.

commit before getting collapse to work

Fix: Use correct add-on branch for 'make update'

Credit to Julian Eisel for the fix.

* Trimesh sculpt now exposes actual pointers for vert "indices."

more int->SculptIdx refactoring

Fluid: Removed fluid levelset argument from pressure solve

It seems that this was causing the instabilities at slanted obstacles (with secondary boundary (fractional) collisions enabled) ...

Fluid: Enabled OpenVDB precision argument

This way particles can be saved with the custom OpenVDB precision options that were introduced in the latest Mantaflow update.

Fluid: Update Mantaflow source files

Updated files includes:
- Fix for smoke / fire emission from particles
- Custom precision for liquid particles when saving in OpenVDB format

* code is in somewhat more working state
* Began refactoring pbvh vertex indices to be uint64_t's,
to eliminate usage of element tables in trimesh.

Fixes T81670: Sculpt paint vertex colors brush does not switch to secondary color using CTRL

This was just not implemented. Now make this consistent with
vertexpainting / texturepainting.

Maniphest Tasks: T81670

Differential Revision: https://developer.blender.org/D9195

Sculpt: Use plasticity for softbody influence

Previously the softbody strength property was controlling the strength
of the constraints that pin all vertices to the original location. This
was causing problems when the forces were trying to deform the vertices
too much, like when using gravity or grab brushes.

Now softbody is implemented with plasticity, which creates constraints to
a separate coordinates array. These coordinates are deformed with the
simulation, and the plasticity parameter controls how much the
simulation moves the coordinates (plasticity 0), or the coordinates move
the simulation back to its previous position (plasticity 1).

This creates much better and predictable results and adding softbody
plasticity to the brushes can increase its control and the stability of
the simulation.

Reviewed By: sergey, zeddb

Differential Revision: https://developer.blender.org/D9187

UI: Motion Tracking: Make Lens a subpanel of Camera

The camera presets control lens settings too so these setting should be
part of the camera panel.

Fix (unreported) LibOverride: possible uninitialized return variable.

Fix T81674: LibOverride: 'Define Override' UI operation can crash.

Case where RNA is not able to generate a proper path for a property was
not taken into account properly.