<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi,<br>
<br>
I converted it to Activiz/C#, I will let Jerome try exactly your
code (since I can't).<br>
<br>
Regards.<br>
<br>
On 12/07/2012 14:49, Bill Lorensen wrote:
<blockquote
cite="mid:CADZJ4hOz1TudnDsuGiECFWNmjOyV35ZCcoC3WgExRFhK27NRLg@mail.gmail.com"
type="cite">In the example I sent? I happen to be running VTK6,
but there should not have been changes.<br>
<br>
<div class="gmail_quote">On Thu, Jul 12, 2012 at 8:35 AM,
Jean-Hugues Royer <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:jhroyer@joher.com" target="_blank">jhroyer@joher.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"> Hi,<br>
<br>
If I do that, the first ~30 points have a distance of 1 and
the rest 0.18648.<br>
<br>
Regards.
<div>
<div class="h5"><br>
<br>
On 12/07/2012 14:12, Bill Lorensen wrote:
<blockquote type="cite">The splines are parameterized by
an approximation to the arc length. Also, the boundary
conditions of the splines can affect the shape of the
spline. Try this version of the script:
<div><br>
</div>
<div>
<div>#!/usr/bin/python</div>
<div>import vtk</div>
<div><br>
</div>
<div>lineSource = vtk.vtkLineSource( )</div>
<div>lineSource.SetPoint1( 0, 0, 0 )</div>
<div>lineSource.SetPoint2( 95, 0 ,0 )</div>
<div>lineSource.Update( )</div>
<div><br>
</div>
<div>mySpline = vtk.vtkCardinalSpline( )</div>
<div>mySpline.SetLeftConstraint(2)</div>
<div>mySpline.SetLeftValue(0.0)</div>
<div>mySpline.SetRightConstraint(2)</div>
<div>mySpline.SetRightValue(0.0)</div>
<div><br>
</div>
<div>spline = vtk.vtkSplineFilter( )</div>
<div>spline.SetSpline(mySpline)</div>
<div>spline.SetInputConnection(
lineSource.GetOutputPort( ))</div>
<div>spline.SetSubdivideToLength( )</div>
<div>spline.SetLength( 0.18648 )</div>
<div>spline.Update( )</div>
<div><br>
</div>
<div>points = spline.GetOutput().GetPoints()</div>
<div><br>
</div>
<div>meanDist = 0</div>
<div><br>
</div>
<div>for i in range( 1, points.GetNumberOfPoints()
):</div>
<div> pt = points.GetPoint(i)</div>
<div> ptPrec = points.GetPoint(i-1)</div>
<div> meanDist += pt[0] - ptPrec[0]</div>
<div> print 'pt[',i,'] X: ',pt[0],' | Distance with
previous point:',pt[0] - ptPrec[0]</div>
<div><br>
</div>
<div>print 'Mean distance: ', meanDist /
points.GetNumberOfPoints()</div>
<div>print 'Expected number of points: ',
95./0.18648</div>
<div>print 'Effective number of points: ',
points.GetNumberOfPoints()</div>
<div><br>
</div>
<div><br>
</div>
<br>
<div class="gmail_quote">On Thu, Jul 12, 2012 at
3:06 AM, Jerome Velut <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:jerome.velut@kitware.com"
target="_blank">jerome.velut@kitware.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt
0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
204, 204); padding-left: 1ex;">
<div bgcolor="#FFFFFF" text="#000000">
<div>Hi Bill and Jean-Hugues,<br>
<br>
I was able to reproduce the bug for a
straight line with vtk-5.10 python (script
attached). I also get the same spline from
paraview by exposing the vtkSplineFilter
(hopefully!).<br>
<br>
Jerome<br>
<br>
Le 10/07/2012 19:09, Bill Lorensen a écrit :<br>
</div>
<div>
<div>
<blockquote type="cite">It is always
possible that there is a bug.<br>
<br>
Can you provide a small, compilable
example that illustrates the problem?<br>
<br>
<div class="gmail_quote">On Tue, Jul 10,
2012 at 10:50 AM, Jean-Hugues Royer <span
dir="ltr"><<a
moz-do-not-send="true"
href="mailto:jhroyer@joher.com"
target="_blank">jhroyer@joher.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin: 0pt 0pt 0pt 0.8ex;
border-left: 1px solid rgb(204, 204,
204); padding-left: 1ex;">
<div bgcolor="#ffffff"
text="#000000"> Hi,<br>
<br>
I also tried vtkSplineFIlter using
SetSubdivideToLength() and
SetLength(distance).<br>
<br>
But the result is that the points
are not equally distributed.<br>
<br>
When you provide a curve the
beginning and ending points are
not equally distributed while the
center points are.<br>
<br>
When you provide a straight line
no points at all are equally
distributed.<br>
<br>
I get exact same result when using
vtkSplineFIlter/SetSubdivideToLength/SetLength
and
vtkParametricSpline/SetParametricFunction/SetUResolution.<br>
<br>
May be I'm missing something ?
<div>
<div><br>
<br>
On 10/07/2012 16:21, Bill
Lorensen wrote:
<blockquote type="cite">Look
at vtkSplineFIlter<br>
Here is one use:<br>
<a moz-do-not-send="true"
href="http://vtk.org/Wiki/VTK/Examples/Cxx/PolyData/FitSplineToCutterOutput"
target="_blank">http://vtk.org/Wiki/VTK/Examples/Cxx/PolyData/FitSplineToCutterOutput</a><br>
<br>
<br>
<div class="gmail_quote"> On
Tue, Jul 10, 2012 at 9:59
AM, Jean-Hugues Royer <span
dir="ltr"><<a
moz-do-not-send="true"
href="mailto:jhroyer@joher.com" target="_blank">jhroyer@joher.com</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin: 0pt 0pt
0pt 0.8ex; border-left:
1px solid rgb(204, 204,
204); padding-left:
1ex;"> Hi,<br>
<br>
I have a curve which is
a vtkPoints array.<br>
<br>
I would like to generate
another vtkPoints array
where every consecutive
points have the same
distance. (basically
divide the curve to n
equals segments)<br>
<br>
I tried to use
vtkParametricSpline/vtkParametricFunctionSource
but I was only able to
change the number of
points to another value
but I didn't find how to
specify that these new
points should be equally
distributed.<br>
<br>
Any idea ?<br>
<br>
_______________________________________________<br>
Powered by <a
moz-do-not-send="true"
href="http://www.kitware.com" target="_blank">www.kitware.com</a><br>
<br>
Visit other Kitware
open-source projects at
<a
moz-do-not-send="true"
href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br>
<br>
Please keep messages
on-topic and check the
VTK FAQ at: <a
moz-do-not-send="true"
href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank">http://www.vtk.org/Wiki/VTK_FAQ</a><br>
<br>
Follow this link to
subscribe/unsubscribe:<br>
<a
moz-do-not-send="true"
href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank">http://www.vtk.org/mailman/listinfo/vtkusers</a><br>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Unpaid intern in
BillsBasement at noware dot
com<br>
<br>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Unpaid intern in BillsBasement at noware
dot com<br>
<br>
<br>
<fieldset></fieldset>
<br>
<pre>_______________________________________________
Powered by <a moz-do-not-send="true" href="http://www.kitware.com" target="_blank">www.kitware.com</a>
Visit other Kitware open-source projects at <a moz-do-not-send="true" href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a>
Please keep messages on-topic and check the VTK FAQ at: <a moz-do-not-send="true" href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank">http://www.vtk.org/Wiki/VTK_FAQ</a>
Follow this link to subscribe/unsubscribe:
<a moz-do-not-send="true" href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank">http://www.vtk.org/mailman/listinfo/vtkusers</a>
</pre>
</blockquote>
<br>
<br>
</div>
</div>
<span><font color="#888888">
<pre cols="72">--
Jérôme Velut
R&D Engineer
Kitware SAS
26 rue Louis Guérin
69100 Villeurbanne, France
F: <a moz-do-not-send="true" href="tel:%2B33%20%280%294.37.45.04.15" value="+33437450415" target="_blank">+33 (0)4.37.45.04.15</a>
<a moz-do-not-send="true" href="http://www.kitware.fr" target="_blank">http://www.kitware.fr</a> </pre>
</font></span></div>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
Unpaid intern in BillsBasement at noware dot com<br>
<br>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
Unpaid intern in BillsBasement at noware dot com<br>
<br>
</blockquote>
</body>
</html>