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Initialize bones on spawn. Note: to obatin bone values, try in Blender "%.3f, %.3f, %.3f" % tuple((bpy.context.object.pose.bones["head.control"].head - bpy.context.object.pose.bones["head.control"].tail) * Vector((1,-1,1))) or "{0:.3f}, {1:.3f}, {2:.3f}".format(*(bpy.context.object.pose.bones["head.control"].head - bpy.context.object.pose.bones["head.control"].tail) @ bpy.context.object.pose.bones["head.control"].matrix * Vector((1,-1,1)))