Hi Gonzalo, I would say<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)"> that there is not one-to-one mapping between original polydata and polydata resulted from </span><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">vtkFeatureEdges. Fast looking to code vtkFeatureEdges.cxx, I found for example </span>







<p class="p1"> vtkTriangleStrip::DecomposeStrip(npts, pts, newPolys);  </p><p class="p1">This can result in different mesh (convert polydata to triangles before running filter). I did not go further inside that code ...</p>
<p class="p1">j.</p>