Blender Git Loki

Merge branch 'blender-v2.83-release'

Fix T77192: Crash when opening bunny.blend file.

New depsgraph code handling drivers was not checking for possible NULL
rna_path, as done everywhere else in code...

Merge branch 'greasepencil-edit-curve' into soc-2020-greasepencil-curve

Merge branch 'blender-v2.83-release'

Fix T72088: Missing header redraw when transform changes snap

Preliminary geometry data exported, without any axes modification.

Single object geometry data exporter: vertex, vertex normal, faces.
Completed the todos in rB3c947bd5a6a2.

Todo:
Add object name.
Export multiple objects in the same file.
Verify it on other complex shapes.
Texture coordinates.

Merge branch 'blender-v2.83-release'

Cleanup: code comments for mode switching

Comment on mode switching cases that are supported,
including the issue from recent regression T77217
which is easy to miss since it's not used in the default key-map.

UI: rename Cycles point light Size to Radius, for consistency and clarity

Differential Revision: https://developer.blender.org/D7888

Cycles: add missing light angle for distant lights in XML reading

Contributed by howetuft.

Differential Revision: https://developer.blender.org/D7891

Merge branch 'blender-v2.83-release'

Cycles: Added shadow terminator offset parameter.

A new user parameter can be used to shift the shadow terminator
towards the light source. With it, one can hide some of the
artifacts that appear on coarse meshes with smooth shading.

Note that this technique is not engery conserving.

This is based on the work by the Appleseed renderer team.

Differential Revision: https://developer.blender.org/D7634

Fix build error in Cycles standalone without guarded allocator

Solution suggested by howetuft.

Differential Revision: https://developer.blender.org/D7892

Fix T77106: Cycles crash baking with AO shader node

Differential Revision: https://developer.blender.org/D7890

Cycles: change perspective depth pass to be more standard

Now it matches Eevee, OpenGL and other renderers. Panoramic camera depth passes
are unchanged, and are still distance from the camera center.

Fix NaN in Cycles environment texture importance sampling in some scenes

Cause identified by Ray Molenkamp.

Fix T77239: snap 3D cursor in edit-mode

Cleanup: Remove Obsolete Current Frame Indicator Drawing Code

This code was made obsolete by the changes to the animation editor
scrubbing areas in D4654.

Differential Revision: https://developer.blender.org/D7898

Fix snap3d crash (missing NULL check)

cleanup