Blender Git Loki

Sketch Retargetting:

Use stroke normal to align roll of the retargetted bones.

Unlike stroke conversion, the final roll is not forced to point exactly to the normal. Rather, It tries to align the X or Z axis of the bones (whichever is closest) to the stroke normal. Forcing the roll can invert knees while this rightly only makes one of the joints rotation axis perpendicular.