// if object haven't parent convertion result will be in global space

_localToWorldMatrix = transform.parent == null ? Matrix4x4.identity : transform.parent.localToWorldMatrix;

_worldToLocalMatrix = _localToWorldMatrix.inverse;

​

Vector3 ToWorldPosition(Vector3 localPosition)

{

    return _localToWorldMatrix.MultiplyPoint3x4(localPosition);;

}

​

Vector3 ToLocalPosition(Vector3 worldPosition)

{

    return _worldToLocalMatrix.MultiplyPoint3x4(worldPosition);

}