Blender Git Loki

Dyntopo: non-topology tool origdata support

Brushes that don't change topology didn't have access to original data.

Cleanup: use meaningful names re: (fc, an, sn)

Dyntopo: support for original normal access

Rename calc_flatten_center to calc_area_center,
since theres no 'flatten' spesific logic there.

Also refactor calc_area_center, calc_area_normal, calc_area_normal_and_center
so they're next to eachother - they're almost the same,
having them scattered about isn't helpful.

Cleanup: move project code into util function

Cleanup: calculating sculpt center & normal

also avoid sqrt calculating dyntopo center (only checks for flipping)

disable verify from last commit (too slow)

Dyntopo: USE_EDGEQUEUE_TAG broke even subdiv

While adding edges to the queue multiple times is redundant,
walking over them is still needed.

Dyntopo: avoid over-counting /w neighbor average

Sculpt: avoid CD lookup /w mask smooth

Sculpt: smooth brush, exclude self from average

Was including the vertices own location when accumulating.

BGE: Support for collision group/mask from the api + activated on EndObject.

A Python API for the collision group / mask has been added:
```
KX_GameObject.collisionGroup
KX_GameObject.collisionMask
```
The maximum number of collision groups and masked has been increased from eight to sixteen.
This means that the max value of collisionGroup/Mask is (2 ** 16) - 1

EndObject will now activate objects that were sleeping and colliding with the removed object.
This means that, unlike now, if a rigid body starts sleeping on top of another object, when the latter is removed the rigid body will activate and fall, rather than float midair as before.

Collision groups that do not intersect used to collide on the first frame. Now this has been fixed so that they collide appropriately.

Thanks to agoose77 for his help.

Reviewers: scorpion81, hg1, agoose77, sergof

Reviewed By: agoose77, sergof

Subscribers: sergof, moguri

Projects: #game_physics, #game_engine

Differential Revision: https://developer.blender.org/D1243

BGE: Fix T43536 logic.getCurrentScene() returning wrong scene in
pre_draw and post_draw calls

A simple insert of KX_SetActiveScene(scene) before pre_draw and
post_draw calls solves the issue.

Reviewers: dfelinto, sybren, brita_, campbellbarton, moguri, lordloki

Reviewed By: moguri, lordloki

Projects: #game_logic, #game_engine

Differential Revision: https://developer.blender.org/D1129

Cleanup: API naming use BKE_undo_ prefix

Cleanup: use BLO_memfile prefix

Autosave:

Flush edits only when saving global undo. This will stop freeing of PBVH
in sculpt mode, which introduces some pretty severe freezes, especially
in dyntopo. For global undo we flush the contents of the global undo
buffer which does not include localized edits of sculpt/edit mode, so
those data will not get saved anyway.

BGE: New Draw debug shadow box for sun lamp

New Check option "Show Shadow Box" in shadow panel of sun lamp to get
feedback about which objects project shadows.

Minor tweaks by Campbell Barton and Jorge Bernal

Reviewers: moguri, sybren, kupoman, dfelinto, lordloki, campbellbarton

Reviewed By: lordloki, campbellbarton

Subscribers: sergey, lordloki

Projects: #game_engine

Differential Revision: https://developer.blender.org/D1149

Fix T44390: Clay brush weirdness part-2

Use the normal of the plane instead of the vertex normal,
since projecting using the vertex normal frequently causes artifacts.

Fix T44390: Clay brush weirdness part-1

Clay brush had a feedback loop with dyntopo,
getting the plane from the cursor center didn't support original data.

Cleanup: simplify sculpt normal accumulation

Cleanup: simplify sculpt plane accumulation