<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Sebastien,<div><br></div><div>Could you send your model (or post a link), please? (or pos</div><div>I'll check and investigate that.</div><div><br></div><div>Arnaud</div><div><br><div><div>On Jan 8, 2010, at 9:30 AM, Sebastien Postaire wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font: inherit;"><div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Hi itk users,<o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">I'm a newbie to itk and I have question regarding mesh curvature computation.<o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">I'm using the class itkQuadEdgeMesh for this purpose :<o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: #a31515; FONT-SIZE: 10pt">"itkQuadEdgeMeshDiscreteMaxCurvatureEstimator.h" </span><span style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">is used to compute the Max curvature</span><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: #a31515; FONT-SIZE: 10pt">"itkQuadEdgeMeshDiscreteMeanCurvatureEstimator.h" </span><span style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">is used to compute the Mean curvature</span><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">I've tested several volumes which I convert first to a mesh and I have noticed that the mean and max curvatures values returned by the above classes are always positive!<o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">I checked with vtkCurvatures class and I’ve found that these curvatures can take negative values (as it is supposed).</span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p></o:p></span> </div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Could someone explain to me why this occurs? <span style="mso-spacerun: yes"> </span><o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Thanks a lot <o:p></o:p></span></div> <div><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Seb<o:p></o:p></span></div><p style="MARGIN: 0cm 0cm 10pt" class="MsoNormal"><o:p><font size="3" face="Calibri"> </font></o:p> </p><div> </div></td></tr></tbody></table><br> <span><ATT00001.txt></span></blockquote></div><br></div></body></html>