Blender Git Loki

Move background images into the camera

This moves background images out of the 3D viewport,
to be used only as camera reference images.

For 3D viewport references,
background images can be used, see: D2827

Some work is still needed
(background option isn't working at the moment).

Merge branch 'master' into blender2.8

Using gtest fixtures in Alembic export tests

Cleanup: Remove unused argument from ED_update_for_newframe

This funciton will be extended, so better to get rid of unused arguments before
adding new ones.

Fix / workaround T53164: Crashes with background scenes

Simple workaround in on_visible_update(). There might be more missing updates or tags.

Tool System: experimental low-poly construction

Tool for creating polygons, exact usage may change based on feedback.

LMB to add faces at boundaries (tris from edges, quads from verts).
- Ctrl splits edges
- Alt to dissolve edges/verts.

Works well with vertex snap & auto-merge.

This uses selection hover but isn't intended to introduce more widely
pre-selection highlighting, at least it will be restricted to this tool.

Merge branch 'master' into blender2.8

Manipulator: Use object bound-box for scale cage

Without this, scaling single objects wasn't working usefully.

Event System: check_click was left set

Caused by own change 137586a13c

Merge branch 'master' into blender2.8

Cycles: use AO factor to let user adjust intensity of AO bounces.

We are already using the AO distance, so might as well offer this extra
control over the intensity. Useful when an interior scene is supposed to
be significantly darker than the background shader.

Fix freestyle UI after workspace > engine changes

Depsgraph: Remove workaround for infinite recursion in scene update

Was needed for legacy lamp/material drivers.

Depsgraph: Cleanup, remove legacy material/lamp driver update functions

Depsgraph: Remove driver evaluation from object update

With new dependency graph this direct call to driver/animation update should
not be needed,

Depsgraph; Introduce new scene update routines which gets an explicit graph

They are still modifying global state, such as ID recalc tags stored in bmain,
need some solution for this.

Fix T53156: VSE not working since Workspace > engine change

This would break if using preview in VSE. We now use the scene engine
not the workspace engine.

That said we could have the preview engine defined as part of the sequence strip
as we had for draw modes in the past. But this is a separated topic for a
separated patch.

This issue in particular was introduced in e4f2b2be26ad.

Note: VSE preview is still broken in two cases:
* If you have Eevee as the engine in the Scene of the Scene strip.
* If you use Clay, save the file, and re-open.

Depsgraph: Make validation to take explicit graph to be checked

Merge branch 'master' into blender2.8

Depsgraph: Cleanup, remove redundant calls to add_component