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<div class="moz-cite-prefix">Hi,<br>
<br>
Bill, your script solved Jean-Hugues' issue with vtk-5.10 and
vtk-6.0.<br>
Jean-Hugues, could it be a mistake in your c# translation?<br>
<br>
Jerome<br>
<br>
Le 12/07/2012 15:09, Jean-Hugues Royer a écrit :<br>
</div>
<blockquote cite="mid:4FFECC8A.3050804@joher.com" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
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>
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<pre cols="72">--
Jérôme Velut
R&D Engineer
Kitware SAS
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69100 Villeurbanne, France
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<pre class="moz-signature" cols="72">--
Jérôme Velut
R&D Engineer
Kitware SAS
26 rue Louis Guérin
69100 Villeurbanne, France
F: +33 (0)4.37.45.04.15
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