RNA: expose access to B-Bone shape data from Python.

B-Bone shape is a non-trivial computation, so access to
the results would be useful for Python scripts working with
B-Bones, e.g. rig generation.

This exposes both final segment matrices, and the tangent
vectors computed from the custom handle bones.

Since the handle tangents use the axis+roll orientation math
of edit bones, add matrix conversion static methods to Bone.

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D3983

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_armature.h b/source/blender/blenkernel/BKE_armature.h
index 1831e93cccb..0e356c1557f 100644
--- a/source/blender/blenkernel/BKE_armature.h
+++ b/source/blender/blenkernel/BKE_armature.h
@@ -165,9 +165,11 @@ typedef struct BBoneSplineParameters {
 } BBoneSplineParameters;
 
 void BKE_pchan_get_bbone_handles(struct bPoseChannel *pchan, struct bPoseChannel **r_prev, struct bPoseChannel **r_next);
+void BKE_pchan_get_bbone_spline_parameters(struct bPoseChannel *pchan, const bool rest, struct BBoneSplineParameters *r_param);
 
 void b_bone_spline_setup(struct bPoseChannel *pchan, const bool rest, Mat4 result_array[MAX_BBONE_SUBDIV]);
 
+void BKE_compute_b_bone_handles(const BBoneSplineParameters *param, float h1[3], float *r_roll1, float h2[3], float *r_roll2, bool ease, bool offsets);
 int BKE_compute_b_bone_spline(struct BBoneSplineParameters *param, Mat4 result_array[MAX_BBONE_SUBDIV]);
 
 void BKE_pchan_cache_bbone_segments(struct bPoseChannel *pchan);