Marcelino,<div><br></div><div>I actually tried that already, but it did not help.<br><br><div class="gmail_quote">On Fri, Nov 11, 2011 at 2:32 PM, Marcelino Rodriguez Cancio <span dir="ltr"><<a href="mailto:marcelinorc@uclv.edu.cu">marcelinorc@uclv.edu.cu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="ES-DO" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Yifei,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Instead of:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">aa.Assign(vtk.vtkDataSetAttributes.VECTORS, vtk.vtkDataSetAttributes.SCALARS, vtk.vtkAssignAttribute.POINT_DATA)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">try:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">aa.Assign(vtk.vtkDataSetAttributes.SCALARS, vtk.vtkDataSetAttributes.VECTORS, vtk.vtkAssignAttribute.POINT_DATA)</span></p></div></div></blockquote>
<div>So this line will compute the magnitudes of the vectors in the point data and treat the magnitudes as active scalars, am I right?</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="ES-DO" link="blue" vlink="purple"><div><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Hope it helps<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Marcelino<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="ES" style="font-size:10.0pt">De:</span></b><span lang="ES" style="font-size:10.0pt"> Yifei Li [mailto:<a href="mailto:yifli82@gmail.com" target="_blank">yifli82@gmail.com</a>]
<br>
<b>Enviado el:</b> miércoles, 09 de noviembre de 2011 08:32 p.m.<br>
<b>Para:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a>; Marcelino Rodriguez Cancio</span></p><div><div></div><div class="h5"><br>
<b>Asunto:</b> Re: [vtkusers] all my streamlines are in white :(<u></u><u></u></div></div><p></p>
</div>
</div><div><div></div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">The structured grid I have only contains vector data. I guess this may be the reason why streamlines are not colored because no scalar data is available for color mapping
<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">I attached my source code. Can someone help me out? Thanks a lot<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Yifei<u></u><u></u></p>
</div>
<div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<div>
<p class="MsoNormal">On Wed, Nov 9, 2011 at 1:50 PM, Yifei Li <<a href="mailto:yifli82@gmail.com" target="_blank">yifli82@gmail.com</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Marcelino, <u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Thank you for your help, but my problem persists.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Setting a lookup table failed (although, like you said, it's not necessary since vtkPolyDataMappe already has one).<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Then I tried vtkAssignAttribute, it does not work for me either. I guess
<span style="font-size:11.5pt;color:#1F497D">aa.Assign("SCALARS", "VECTORS", "POINT_DATA") </span>means treat the point data (velocity vectors) in the grid as scalars, which makes sense to me.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">I took a look at another example Examples/VisualizationAlgorithms/Python/OfficeTube.py, the only thing that's relevant to streamline coloring is<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">mapStreamTube.SetScalarRange(reader.GetOutput().GetPointData().GetScalars().GetRange()), where mapStreamTube is a PolyDataMapper<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">What I have in my program is very similar to the above:<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">streamMapper.SetScalarRange(0.0, grid.GetPointData().GetVectors().GetMaxNorm())<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">I print out the the value of GetMaxNorm() and it is not zero.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
<div>
<div>
<div>
<p class="MsoNormal">On Wed, Nov 9, 2011 at 11:47 AM, Marcelino Rodriguez Cancio <<a href="mailto:marcelinorc@uclv.edu.cu" target="_blank">marcelinorc@uclv.edu.cu</a>> wrote:<u></u><u></u></p>
</div>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<div>
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Yifei,</span><u></u><u></u></p>
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">>></span><span lang="EN-US"> no lookup table is set for the streamMapper. Why?</span><u></u><u></u></p>
</div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Because vtkPolyDataMapper has a default vtkLookUpTable.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">If I'm correct vtkPolyDataMapper colors via the active scalars of the dataset. A common trick is to color the vectors by
their magnitude (although this may not be want you want). You may achieve this using vtkAssingAtributte with something like the following:</span><u></u><u></u></p>
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">aa = vtkAssignAttribute()
</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">aa. SetInput(grid)</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">#Not so sure how to do this in Python since I have only worked in C++ and TCL</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">aa.Assign("SCALARS", "VECTORS", "POINT_DATA")</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">streamer.SetInputConnection(aa.GetOutputPort())</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Hope it helps</span><u></u><u></u></p>
</div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Marcelino</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="ES" style="font-size:10.0pt">De:</span></b><span lang="ES" style="font-size:10.0pt">
<a href="mailto:vtkusers-bounces@vtk.org" target="_blank">vtkusers-bounces@vtk.org</a> [mailto:<a href="mailto:vtkusers-bounces@vtk.org" target="_blank">vtkusers-bounces@vtk.org</a>]
<b>En nombre de </b>Yifei Li</span><u></u><u></u></p>
<div>
<p class="MsoNormal"><br>
<b>Enviado el:</b> miércoles, 09 de noviembre de 2011 10:07 a.m.<br>
<b>Para:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><u></u><u></u></p>
</div>
<p class="MsoNormal"><b>Asunto:</b> Re: [vtkusers] all my streamlines are in white :(
<u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Marcelino,
<u></u><u></u></p>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Thank you. I'll try you suggestion.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">But at the same time, if you take a look at the example that comes with VTK Examples/GUI/Python/StreamlinesWithLineWidget.py, no lookup table is set for the streamMapper. Why?<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Yifei<u></u><u></u></p>
<div>
<p class="MsoNormal">On Wed, Nov 9, 2011 at 8:16 AM, Marcelino Rodriguez Cancio <<a href="mailto:marcelinorc@uclv.edu.cu" target="_blank">marcelinorc@uclv.edu.cu</a>> wrote:<u></u><u></u></p>
<div>
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Yifei:</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">I think you need to add a vtkLookUpTable:</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">lut = vtkLookupTable()</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">lut.SetHueRange(667, 0.0)</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">lut.Build()</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">streamMapper.SetLookupTable(lut)</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Greetings</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D">Marcelino</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="ES" style="font-size:10.0pt">De:</span></b><span lang="ES" style="font-size:10.0pt">
<a href="mailto:vtkusers-bounces@vtk.org" target="_blank">vtkusers-bounces@vtk.org</a> [mailto:<a href="mailto:vtkusers-bounces@vtk.org" target="_blank">vtkusers-bounces@vtk.org</a>]
<b>En nombre de </b>Yifei Li<br>
<b>Enviado el:</b> martes, 08 de noviembre de 2011 08:24 p.m.<br>
<b>Para:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>Asunto:</b> [vtkusers] all my streamlines are in white :(</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Hi all,
<u></u><u></u></p>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">I want streamlines to be colored according to scalar values, but they are all white. Can someone help me figure out what's wrong with my code? Thanks -Yifei<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"># vector field data<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">grid = vtkStructuredGrid()<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">grid.SetPoints(points)<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">grid.GetPointData().SetVectors(vectors)<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">....<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">streamer = vtkStreamTracer()<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">...<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"># show streamlines using ribbon<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">rf = vtkRibbonFilter()<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">rf.SetInputConnection(streamer.GetOutputPort())<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">streamMapper = vtkPolyDataMapper()<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">streamMapper.SetInputConnection(rf.GetOutputPort())<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"># I thought the following lines should make it <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">streamMapper.ScalarVisibilityOn()<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">streamMapper.SetScalarRange(0.0, grid.GetPointData().GetVectors().GetMaxNorm())<u></u><u></u></p>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
</div>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="2" width="100%" align="center">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:7.5pt;color:gray">-Universidad Central "Marta Abreu" de Las Villas.
<a href="http://www.uclv.edu.cu" target="_blank">http://www.uclv.edu.cu</a><br>
-Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana.Cuba. <a href="http://www.congresouniversidad.cu" target="_blank">
http://www.congresouniversidad.cu</a><br>
-Consulte la enciclopedia colaborativa cubana. <a href="http://www.ecured.cu/" target="_blank">
http://www.ecured.cu/</a></span><u></u><u></u></p>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="2" width="100%" align="center">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:7.5pt;color:gray">-Universidad Central "Marta Abreu" de Las Villas.
<a href="http://www.uclv.edu.cu" target="_blank">http://www.uclv.edu.cu</a><br>
-Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana.Cuba. <a href="http://www.congresouniversidad.cu" target="_blank">
http://www.congresouniversidad.cu</a><br>
-Consulte la enciclopedia colaborativa cubana. <a href="http://www.ecured.cu/" target="_blank">
http://www.ecured.cu/</a></span><u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="2" width="100%" align="center">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:7.5pt;color:gray">-Universidad Central "Marta Abreu" de Las Villas.
<a href="http://www.uclv.edu.cu" target="_blank">http://www.uclv.edu.cu</a><br>
-Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana.Cuba. <a href="http://www.congresouniversidad.cu" target="_blank">
http://www.congresouniversidad.cu</a><br>
-Consulte la enciclopedia colaborativa cubana. <a href="http://www.ecured.cu/" target="_blank">
http://www.ecured.cu/</a></span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="2" width="100%" align="center">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:7.5pt;color:gray">-Universidad Central "Marta Abreu" de Las Villas.
<a href="http://www.uclv.edu.cu" target="_blank">http://www.uclv.edu.cu</a><br>
-Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana.Cuba. <a href="http://www.congresouniversidad.cu" target="_blank">
http://www.congresouniversidad.cu</a><br>
-Consulte la enciclopedia colaborativa cubana. <a href="http://www.ecured.cu/" target="_blank">
http://www.ecured.cu/</a><br>
<br>
</span><u></u><u></u></p>
</div>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>
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</blockquote>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="2" width="100%" align="center">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:7.5pt;color:gray">-Universidad Central "Marta Abreu" de Las Villas. <a href="http://www.uclv.edu.cu" target="_blank">http://www.uclv.edu.cu</a><br>
-Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana.Cuba. <a href="http://www.congresouniversidad.cu" target="_blank">http://www.congresouniversidad.cu</a><br>
-Consulte la enciclopedia colaborativa cubana. <a href="http://www.ecured.cu/" target="_blank">http://www.ecured.cu/</a><br>
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<font face="Arial" color="Gray" size="1">-Universidad Central "Marta Abreu" de Las Villas. <a href="http://www.uclv.edu.cu" target="_blank">http://www.uclv.edu.cu</a><br>
-Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana.Cuba. <a href="http://www.congresouniversidad.cu" target="_blank">http://www.congresouniversidad.cu</a><br>
-Consulte la enciclopedia colaborativa cubana. <a href="http://www.ecured.cu/" target="_blank">http://www.ecured.cu/</a><br>
<br>
<br>
</font>
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