I've not understood what do you mean for " it isn't a closed form solution as advertised." and "The complete closed-form solution was developed later. " -- View this message in context: http://vtk.1045678.n5.nabble.com/vtkLandmarkTransform-alghoritm-tp5052711p5053659.html Sent from the VTK - Users mailing list archive at Nabble.com.