Add a new B-Bone Custom Handle type that uses the handle bone direction.

Both original handle types are based on location, and Absolute uses it
in a weird way: the Start handle uses the head, while End uses the tail.

This makes controlling the shape of the B-Bone via control bone rotation
really non-intuitive, especially if trying to add a single control for
the tangent in the middle of a B-Bone chain.

To remedy this, add a new custom handle type that uses the orientation
of the control bone, while completely ignoring location. It is even
possible to control both ends of one B-Bone with the same handle bone,
resulting in an S shape.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D3769

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_armature.c b/source/blender/makesrna/intern/rna_armature.c
index 4fd42a97568..2a83d7350bb 100644
--- a/source/blender/makesrna/intern/rna_armature.c
+++ b/source/blender/makesrna/intern/rna_armature.c
@@ -655,6 +655,7 @@ static void rna_def_bone_common(StructRNA *srna, int editbone)
 		{BBONE_HANDLE_AUTO, "AUTO", 0, "Automatic", "Use connected parent and children to compute the handle"},
 		{BBONE_HANDLE_ABSOLUTE, "ABSOLUTE", 0, "Absolute", "Use the position of the specified bone to compute the handle"},
 		{BBONE_HANDLE_RELATIVE, "RELATIVE", 0, "Relative", "Use the offset of the specified bone from rest pose to compute the handle"},
+		{BBONE_HANDLE_TANGENT, "TANGENT", 0, "Tangent", "Use the orientation of the specified bone to compute the handle, ignoring the location"},
 		{0, NULL, 0, NULL, NULL}
 	};