Blender Git Loki

Fix previous error with spring length scaling

Zero-length springs weren't being scaled properly, leading to phantom
forces that introduced rigid-body motion into the simulation.

Implement improved compression model

This implements the Choi and Ko compression model, with an added damping
component, instead of using the same model as for tension, which
improves stability of the internal forces.

Some more comments etc. to AssetEngine API.

Fix objects not disappearing after unlinking collection

Fix bad behavior when switching between asset engines with incompatible paths.

A path valid for a given AE can be invalid with another, we need to
check current path when switching between AEs.

Also do proper check of valid path for Amber engines.

Fix depsgraph: hair collision is actually enabled, so add the relations.

Fix compilation error on recent Debian desktop

Something funny happened here, there were missing symbols from png
library to math functions.

Merge branch 'master' into asset-engine

3D cursor & mini axis for modern viewport

Shuffle existing code, hook it up to the new (& old) viewport.

Also the 3D mouse rotation guide for NEW viewport only. Minor feature not worth enabling for legacy 3D view.

OpenGL: delete bl_debug_draw

Eliminating this chunk of legacy GL as part of T49043.

We can introduce some sort of "debug plate" to fill this need in the future.

cleanup: C99 for view3d_draw

Mostly for clarity & to declare things close to where they are used.

I'm getting ready to do substantial work in these files.

Make duplicating workspaces work

Fixes for changing layout with workspace

Changing workspace should now change to the active layout of the workspace just fine.
Screen/workspace changing is still a bit hacky since we can't do it during normal handlers. Not sure how we could do it instead, for now I'm just copying hacks from screen changing.

Fix T50141: Nabla zero division on texture force field

This sets forces to zero, when Nabla is zero and a grayscale texture is
used or texture mode is Gradient or Curl.

Nabla equal to zero was causing a zero division, and forces ended up
being set to `nan`.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D2393

CMake: disable QuickTime with macOS SDK 10.12+, no longer supported by Apple.

Fix macOS 10.9 build when using OIIO without FFmpeg.

removed high res getter for flags grid

Docs: Show 'Other Options' last in --help

Own error when changing order,
moving experimental features last made some sense,
but causes them to be listed twice.

Reorder and comment to avoid it happening again.

Cleanup: simplify bitmap line drawing

- Expand overly dense & confusing delta assignments.
- Replace bit shift with multiply.

Also link to 'clipped' version of this function
which may be useful to add later.

Code clean-up (remove unnecessary struct members and add comments)

Spring forces and jacobians (f, dfdx and dfdv), were unnecessarily being
stored in sring struct. They are only used locally at computation time,
and don't have to remain in memory.

editrestlen was unused.