Blender Git Loki

Fix headless and Python module build after recent alert icon changes

GPencil: Remove duplicated Mode parameter from Color Subpanel in Vertex Paint

This parameter is now at Brush level, so it was duplicated in the Color panel.

Cleanup: Rename variables

GPencil: Remove background to Dopesheet buttons

This was missing in previous commit.

Fix BPY enum property definiton failing if items contain spaces

Mistake in 03a4d3c33f82, turns out this actually is called from BPY
(which I didn't think it was). So only error out during makesrna, not at
runtime.

Cleanup: spelling

Tests: add OpenVDB volume tests

Volumes: add render settings for volume datablock

* Space: volume density and step size in object or world space
* Step Size: override automatic step size
* Clipping: values below this are ignored for tighter volume bounds

The last two are Cycles only currently.

Ref T73201

Cycles: change volume step size controls, auto adjust based on voxel size

By default it will now set the step size to the voxel size for smoke and
volume objects, and 1/10th the bounding box for procedural volume shaders.

New settings are:
* Scene render/preview step rate: to globally adjust detail and performance
* Material step rate: multiplied with auto detected per-object step size
* World step size: distance to steo for world shader

Differential Revision: https://developer.blender.org/D1777

Cycles: support for rendering of new Hair object prototype

Ref T68981

Cycles: support rendering new Volume object type

Voxels are loaded directly from the OpenVDB grid. Rendering still only supports
dense grid, so memory usage is not great for sparse volumes, this is to be
addressed in the future.

Ref T73201

Cycles: support for different 3D transform per volume grid

This is not yet fully supported by automatic volume bounds but works fine in
most cases that will have mostly matching bounds.

Ref T73201

Objects: Eevee and workbench rendering of new Volume, Hair, PointCloud

Only the volume drawing part is really finished and exposed to the user. Hair
plugs into the existing hair rendering code and is fairly straightforward. The
pointcloud drawing is a hack using overlays rather than Eevee and workbench.

The most tricky part for volume rendering is the case where each volume grid
has a different transform, which requires an additional matrix in the shader
and non-trivial logic in Eevee volume drawing. In the common case were all the
transforms match we don't use the additional per-grid matrix in the shader.

Ref T73201, T68981

Differential Revision: https://developer.blender.org/D6955

Objects: add Volume object type, and prototypes for Hair and PointCloud

Only the volume object is exposed in the user interface. It is based on OpenVDB
internally. Drawing and rendering code will follow in another commit.
https://wiki.blender.org/wiki/Source/Objects/Volume
https://wiki.blender.org/wiki/Reference/Release_Notes/2.83/Volumes

Hair and PointCloud object types are hidden behind a WITH_NEW_OBJECT_TYPES
build option. These are unfinished, and included only to make it easier to
cooperate on development in the future and avoid tricky merges.
https://wiki.blender.org/wiki/Source/Objects/New_Object_Types

Ref T73201, T68981

Differential Revision: https://developer.blender.org/D6945

UI: add new icons for Volume, Hair and PointCloud

GPencil: Cleanup int comparisons

GPencil: Invert Dopesheet icons to same order than properties panel

Weight Paint: Implement a new Lock-Relative mode.

This check box alters how weights are displayed and painted,
similar to Multi Paint, but in a different way. Specifically,
weights are presented as if all locked vertex groups were
deleted, and the remaining deform groups normalized.

The new feature is intended for use when balancing weights within
a group of bones while all others are locked. Enabling the option
presents weight as if the locked bones didn't exist, and their
weight was proportionally redistributed to the editable bones.

Conversely, the Multi-Paint feature allows balancing a group of
bones as a whole against all unselected bones, while ignoring
weight distribution within the selected group.

This mode also allows temporarily viewing non-normalized weights
as if they were normalized, without actually changing the values.

Differential Revision: https://developer.blender.org/D3837

Modifier: skip calling MOD_deform_mesh_eval_get

This is only needed in certain cases.

When testing performance improvements to the modifier stack
it's useful to bypass this function.

Fix typo causing compile error with WITH_XR_OPENXR disabled