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Thanks Jeff for the quick and helpful reply. I will update my VTK
installation as soon as possible.<br>
<br>
Steffen<br>
<br>
On 10.02.2011 20:53, Jeff Baumes wrote:
<blockquote
cite="mid:AANLkTinDreubNCDT0Ro=RTRp=HecP=0GJz+DqWnPQea6@mail.gmail.com"
type="cite">
<meta charset="utf-8">
<span class="Apple-style-span" style="border-collapse: collapse;
font-family: arial,sans-serif; font-size: 13px;">Steffen,</span>
<div><font class="Apple-style-span" face="arial, sans-serif"><span
class="Apple-style-span" style="border-collapse: collapse;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span
class="Apple-style-span" style="border-collapse: collapse;">Thanks
for your detailed report. The issue was that the filter that
updated colors (vtkApplyColors) did not update when the
underlying lookup table is modified. I just pushed a change
to VTK master that fixes this. The following python script
shows how to change the lookup table and re-render the view:</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span
class="Apple-style-span" style="border-collapse: collapse;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span
class="Apple-style-span" style="border-collapse: collapse;">
<div>
from vtk import *</div>
<div>import time</div>
<div><br>
</div>
<div>s = vtkRandomGraphSource()</div>
<div>view = vtkGraphLayoutView()</div>
<div>rep =
view.SetRepresentationFromInputConnection(s.GetOutputPort())</div>
<div>rep.ColorVerticesByArrayOn()</div>
<div>lut = vtkLookupTable()</div>
<div>lut.Build()</div>
<div>theme = vtkViewTheme()</div>
<div>theme.SetPointLookupTable(lut)</div>
<div>view.ApplyViewTheme(theme)</div>
<div>view.ResetCamera()</div>
<div>view.Render()</div>
<div>
time.sleep(2)</div>
<div><br>
</div>
<div># Modify the lookup table</div>
<div>lut.SetHueRange(0.0, 0.0)</div>
<div>lut.Build()</div>
<div>view.Render()</div>
<div>time.sleep(2)</div>
</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span
class="Apple-style-span" style="border-collapse: collapse;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span
class="Apple-style-span" style="border-collapse: collapse;">Jeff</span></font></div>
<div><br>
<div class="gmail_quote">On Tue, Feb 8, 2011 at 11:18 AM,
Steffen Oeltze <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:stoeltze@isg.cs.uni-magdeburg.de">stoeltze@isg.cs.uni-magdeburg.de</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;">Dear VTK-users<br>
<br>
I have written an application that displays a graph with
colored edges. The application is interactive and I would
like to change the edge coloring depending on some user
interaction. The coloring is accomplished via a
vtkLookupTable and a vtkViewTheme. I tried two different
strategies so far. Unfortunately, only the second one works
which I guess is slower and less effective than the first
one. The first one only works if I manually enforce a new
rendering of the graph by selecting, e.g., an edge. In my
source code, I tried several update mechanisms, e.g.,
calling Modified() on the vtkViewTheme after reassigning the
modified vtkLookupTable, but none of them worked. Any help
on how I can imitate the update-mechanism which is initiated
after edge selection is deeply appreciated.<br>
<br>
1.) (works only after manual update)<br>
- generate the vtkLookupTable, a vtkViewTheme, and a
vtkGraphLayoutView<br>
- assign the vtkLookupTable to the vtkViewTheme<br>
- assign the vtkViewTheme to the vtkGraphLayoutView<br>
- render the graph<br>
...user interaction...<br>
- update the vtkLookupTable<br>
- render the graph again<br>
<br>
2.) (works)<br>
- generate the vtkLookupTable, a vtkViewTheme, and a
vtkGraphLayoutView<br>
- assign the vtkLookupTable to the vtkViewTheme<br>
- assign the vtkViewTheme to the vtkGraphLayoutView<br>
- delete the vtkViewTheme<br>
- render the graph<br>
...user interaction...<br>
update the vtkLookupTable<br>
- generate a new vtkViewTheme<br>
- assign the modified vtkLookupTable to the new vtkViewTheme<br>
- assign the new vtkViewTheme to the vtkGraphLayoutView<br>
- delete the new vtkViewTheme<br>
- render the graph again<br>
<br>
Steffen<br>
<br>
-- <br>
Dr.-Ing. Steffen Oeltze<br>
Department of Simulation and Graphics, School of Computer
Science<br>
Otto-von-Guericke-University Magdeburg<br>
<br>
Universitätsplatz 2, 39106 Magdeburg<br>
GERMANY<br>
<br>
Phone: (+49-391) 67-1 25 27<br>
Fax: (+49 391) 67-1 11 64<br>
Email: <a moz-do-not-send="true"
href="mailto:stoeltze@isg.cs.uni-magdeburg.de"
target="_blank">stoeltze@isg.cs.uni-magdeburg.de</a><br>
Web: <a moz-do-not-send="true"
href="http://www.vismd.de/" target="_blank">http://www.vismd.de/</a><br>
<br>
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</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Jeff Baumes, Ph.D.<br>
Technical Lead, Kitware Inc.<br>
(518) 881-4932<br>
</div>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Dr.-Ing. Steffen Oeltze
Department of Simulation and Graphics, School of Computer Science
Otto-von-Guericke-University Magdeburg
Universitätsplatz 2, 39106 Magdeburg
GERMANY
Phone: (+49-391) 67-1 25 27
Fax: (+49 391) 67-1 11 64
Email: <a class="moz-txt-link-abbreviated" href="mailto:stoeltze@isg.cs.uni-magdeburg.de">stoeltze@isg.cs.uni-magdeburg.de</a>
Web: <a class="moz-txt-link-freetext" href="http://www.vismd.de/">http://www.vismd.de/</a></pre>
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