Bendy Bones: Advanced B-Bones for Easier + Simple Rigging

This commit/patch/branch brings a bunch of powerful new options for B-Bones and
for working with B-Bones, making it easier for animators to create their own
rigs, using fewer bones (which also means hopefully lighter + faster rigs ;)
This functionality was first demoed by Daniel at BConf15

Some highlights from this patch include:
* You can now directly control the shape of B-Bones using a series of properties
  instead of being restricted to trying to indirectly control them through the
  neighbouring bones.  See the "Bendy Bones" panel...

* B-Bones can be shaped in EditMode to define a "curved rest pose" for the bone.
  This is useful for things like eyebrows and mouths/eyelids

* You can now make B-Bones use custom bones as their reference bone handles,
  instead of only using the parent/child bones. To do so, enable the
  "Use Custom Reference Handles" toggle. If none are specified, then the BBone will
  only use the Bendy Bone properties.

* Constraints Head/Tail option can now slide along the B-Bone shape, instead of
  just linearly interpolating between the endpoints of the bone.

For more details, see:
* http://aligorith.blogspot.co.nz/2016/05/bendy-bones-dev-update.html
* http://aligorith.blogspot.co.nz/2016/05/an-in-depth-look-at-how-b-bones-work.html



-- Credits --
Original Idea: Daniel M Lara (pepeland)
Original Patch/Research: Jose Molina
Additional Development + Polish: Joshua Leung (aligorith)
Testing/Feedback: Daniel M Lara (pepeland), Juan Pablo Bouza (jpbouza)

1 files changed, 6 insertions, 3 deletions

diff --git a/source/blender/blenkernel/BKE_action.h b/source/blender/blenkernel/BKE_action.h
index c164cd542f3..cb282b46bec 100644
--- a/source/blender/blenkernel/BKE_action.h
+++ b/source/blender/blenkernel/BKE_action.h
@@ -79,12 +79,15 @@ typedef enum eAction_TransformFlags {
 	ACT_TRANS_ROT   = (1 << 1),
 	/* scaling */
 	ACT_TRANS_SCALE = (1 << 2),
-
+	
+	/* bbone shape - for all the parameters, provided one is set */
+	ACT_TRANS_BBONE = (1 << 3),
+	
 	/* strictly not a transform, but custom properties are also
 	 * quite often used in modern rigs
 	 */
-	ACT_TRANS_PROP  = (1 << 3),
-
+	ACT_TRANS_PROP  = (1 << 4),
+	
 	/* all flags */
 	ACT_TRANS_ONLY  = (ACT_TRANS_LOC | ACT_TRANS_ROT | ACT_TRANS_SCALE),
 	ACT_TRANS_ALL   = (ACT_TRANS_ONLY | ACT_TRANS_PROP)