<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">If i check number of points, it is changing when i modify SetLength, so i can not understand why not draw the spline.<div><br></div><div><div>vtkSplineFilter sf</div><div> #sf SetInput planeCut</div><div> sf SetInput [planeCut GetOutput]</div><div> sf SetSubdivideToLength</div><div> sf SetLength 0.1</div><div> sf Update</div><div><font class="Apple-style-span" color="#00007F">puts "Initial centerline number of points: [[sf GetOutput] GetNumberOfPoints]"</font></div><div> # sf SetLength 0.01</div><div>vtkTubeFilter rf</div><div> rf SetInput [sf GetOutput]</div><div> rf SetRadius 0.08</div><div> rf SetNumberOfSides 6</div></div><div><br></div><div>Pablo</div><div> </div></td></tr></table><br>