Ok, but then I should be able to find the edge's target position in the points generated by the the function get_hierarchy_control_points right? If it is not the last two components of the vector (boundary condition?) it should at the position [-4:-3]? If I understand correctly what you said, from the function get_hierarchy_control_points I should get n*(6 components) I got n*(6 components)+2. The last two are not used because there are boundary conditions (I do not get this but I need to read the paper you are citing, and I cannot access it right now because I cannot reach sci hub...). The 6 components are from the 3 points, 2 intermediates, 1 finale. The finale is the target right? So for get_hierarchy_control_points each [6n+4:6n+5] coordinates are coordinates of a target in the hierarchical graph. But the very last coordinates is the edge's target, isn't it? -- Sent from: https://nabble.skewed.de/