Blender Git Loki

UI: Color Ramp: Add menu and functions to distribute color stops

Suggestion from Right-Click Select: https://blender.community/c/rightclickselect/Npcbbc/color-ramp-flags-auto-distribution-function

Differential Revision: https://developer.blender.org/D3965

Merge branch 'master' into blender2.8

Fix T57923: Freeze in mesh vnors computation code with some degenerated geometry.

Second part of the fix: do not try at all to compute normals in degenerated
geometry. Just loss of time and potential issues later with weird
invalid computed values.

Fix T57923: Freeze in mesh vnors computation code with some degenerated geometry.

Fix first part of it, the freeze itself being caused by float NAN values
never comparing equal to anything, not even themselves.

Merge branch 'blender2.8' into greasepencil-object

GP: Reorganize Reproject options

The options depend of drawing mode and this was very strange. Now, the options are listed in the menu.

GP: Set Gizmo orientation for edit mode

Speedup rigs with multiple objects deformed by bbones

Previously each of the objects which has armature modifier will
request deformation matricies from bbones. Thing is, all those
deformations are the same and do not depend on object which is
being modified. What's even worse is that this calculation is
not cheap.

This change makes it so bbones deformation is calculated once
and stored in the armature object. After this armature modifiers
simply use it.

With a rigs we've got here dependency graph evaluation time
goes down from 0.02 sec to 0.012 sec.

Possible further optimization is to make bbone deformation
calculated at the time when bone is calculated. This will avoid
an extra threaded loop over all bones.

Cleanup: Use more const qualifiers

Merge branch 'master' into blender2.8

Task scheduler: Optimize parallel loop over lists

The goal is to address performance regression when going from
few threads to 10s of threads. On a systems with more than 32
CPU threads the benefit of threaded loop was actually harmful.

There are following tweaks now:

- The chunk size is adaptive for the number of threads, which
minimizes scheduling overhead.

- The number of tasks is adaptive to the list size and chunk
size.

Here comes performance comparison on the production shot:

Number of threads DEG time before DEG time after
44 0.09 0.02
32 0.055 0.025
16 0.025 0.025
8 0.035 0.033

Comment out all derived mesh evaluation

Seems all the usecases of derived mesh are if-defed already,
so no need to have API for it in place, and definitely no
need to waste CPU ticks on converting evaluated mesh to
derived mesh.

Depsgraph: Don't use derived mesh

Ideally would need to make check based on evaluated mesh,
but is now a good time to go away from derived mesh.

Modifier stack: Only ensure derived mesh when USE_DERIVEDMESH is defined

This is more an internal transition away from derived mesh.

Modifier stack: Use evaluated mesh to check normals

Vertex parent: Remove CCGDM optimization

Currently we never return CCGDM from the modifier stack,
so the optimization was doing pretty much nothing.

Removing it completely for now, it needs to be re-done
with the new evaluated Mesh/Subdiv.

UI: increase spacing at sides of headers, to avoid region split zone overlap.

Fis T57948: Crash in 2.8x lookdev

Fix T57891: Radius of strip hair doesn't scale with object scale

Note that this only works fine with uniformly scaled objects.
Otherwise, the hair thickness will vary in a weird way depending on viewing
angles.

Images: "Image" submenu in "Add" menu

The submenu has two entries currently: "Reference" and "Background".
Both operators produce an image empty with different settings.