Blender Git Loki

Filter out pie spawn button events.

The reason being, with the current system of quick selection, it's
possible to spawn an operator after confirmation, especially for cases
with modifier buttons.

Integrated limits for volume preservation in stretch-to constraints.

Currently the volume variation feature in stretch constraints is
unlimited. This has to be compensated by riggers by adding scale limit
constraints, but these are unaware of the stretch orientation and can
lead to flipping. Also the stretch calculation itself is not working
properly and can lead to collapsing volume.

The patch fixes this with several modifications:
- Interpret the volume variation factor as exponent, which works better
with large values for artistic purposes.
- Add integrated limits to the volume "bulge" factor, so secondary
constraints for compensation become unnecessary
- Add a smoothness factor to make limits less visible.

Eventually a generic volume preservation constraint would be nicer,
because multiple constraints currently implement volume variation of
their own. This feature could actually work very nicely independent from
other constraint features.

Differential Revision: https://developer.blender.org/D826

Some corrections to the pie spawning code to account for nested pies.

Fix T42206: RenderLayers popup crashed when clicked while rendering

Fix T42198: Linked lines only work with linked objects.

The reported issue was caused by a backward incompatibility due to careless
code changes made when per-material Freestyle line colors were introduced
in rB7915d7277ac8c605f016f30f943080556244fb59. In 2.71 line style
Material color/alpha/thickness modifiers was retrieving alpha transparency
from Material.alpha, whereas in 2.72 Material.line_color[3] was referenced.

The present fix reverts the aforementioned code changes.

This issue is a regression from 2.71, so the fix is appropriate for inclusion in
the 2.72a release.

Code cleanup: Move output arguments to the end of the list

Roto: Improve spline sliding vs. curvature detection

If the mouse is closer to the spline than to it's center do a
spline curvature correction operator instead.

Code cleanup: Prevent possible int->float conversion

Code cleanup: Use new SQUARE() macro to get squared distance threshold

Fix T42005: Reset py-handlers could crash

Wasn't acquiring the GIL.

Mesh Inset: select internal faces by default

Fix T42205: MovieClip ignores grid color

Cleanup: redundant cast

Error in last commit

BLI_utildefines: add SQUARE macro

also minor cleanup

Fix embarrassing typo...

Pie menus: Confirm threshold

This commit adds a confirm threshold property to pie menus.

Basically, this will confirm the pie menu automatically when
the distance from the center of the pie exceeds that threshold without
a need to release the pie button.

The confirm threshold will only work if it is larger than the pie
threshold.

The confirmation actually occur when the mouse stops moving, to
allow multiple pie menus to be better linked together, (see below)

This functionality also facilitates the ability for chained pie menus by
dragging. Basically, a pie menu item can be a call_menu_pie operator and
the new pie menu will still use the original pie menu release event for
confirmation. This should allow for quick, gesture based navigation in
pie menu hierarchies (going back in the hierarchy is still not supported
though)

There will be a demonstration pie in the official add-on soon

Mesh calc smooth group: several fixes.

* Consider non-manifold edges as sharp, as in split normals handling.
* Consider edges from sharp polys as sharp!!!
* Fix returned number of groups (was off-by-one for non-bitflags grouping, could also
be wrong in case of id overflow).

Note about using sharp polys too to define groups: Only current use of this function
(Obj exporter) does not need that, because it does its own check for sharp faces.
However, we might reuse that func in other places in future (e.g. in custom split
normals area), so better to get a consistent behavior!

Minor typo fix, reported by Sebastian Koenig on irc. Thanks!

Cycles: Add CUDA support for sm_32 (Tegra K1, Jetson TK1).

Fix T42174.