private void StartDragging(MuscleJoint joint)
{
_isDragging = true;
if (_ikHierarchy != null)
{
DestroyHierarchy(_ikHierarchy);
}
_jointHierarchy = IKSolver.GetHierarchy(joint);
_ikHierarchy = IKSolver.CopyHierarchy(_jointHierarchy);
_ikTarget.position = joint.transform.position;
_ikTarget.rotation = joint.transform.rotation;
Vector3 screenSpacePosition = _camera.GetComponent <Camera>().WorldToScreenPoint(joint.transform.position);
_dragDepth = screenSpacePosition.z;
Vector3 cursorPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpacePosition.z);
_dragOffset = joint.transform.position - _camera.GetComponent <Camera>().ScreenToWorldPoint(cursorPosition);
}
