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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Hi Aashish,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">I applied the patch to the latest VTK (from GIT) and rebuilt it.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">An error occurred when I run the test program you gave me without gradient opacity.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Please find the attached file.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">I am not sure why…</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thank you,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Kenji</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Aashish Chaudhary [mailto:aashish.chaudhary@kitware.com]
<br>
<b>Sent:</b> Wednesday, December 09, 2015 9:04 AM<br>
<b>To:</b> Kenji Tsumura<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] vtkVolumeProperty IndependentComponents On and Off</span></p>
<p class="MsoNormal"> </p>
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<p class="MsoNormal">Hi Kenji, </p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">Could you please try the attached patch? Once if works for you, I will clean it up and create a merge request. </p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">Thanks,</p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">On Tue, Dec 8, 2015 at 11:41 AM, Aashish Chaudhary <<a href="mailto:aashish.chaudhary@kitware.com" target="_blank">aashish.chaudhary@kitware.com</a>> wrote:</p>
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<p class="MsoNormal">Aha... I think I know how to fix the bug. Gradient opacity was the key. I will push a fix today. <span class="hoenzb"><span style="color:#888888"></span></span></p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal"><span style="color:#888888">- Aashish</span></p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">On Tue, Dec 8, 2015 at 11:30 AM, Kenji Tsumura <<a href="mailto:kenji.tsumura@neosoftmedical.com" target="_blank">kenji.tsumura@neosoftmedical.com</a>> wrote:</p>
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<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Hi Aashish,</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Adding gradient opacity to the test sample causes the same error I have seen in my application.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Please refer to the attached file.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">So my application works with IndependentComponents On after removing gradient opacity.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Kenji</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Aashish Chaudhary [mailto:<a href="mailto:aashish.chaudhary@kitware.com" target="_blank">aashish.chaudhary@kitware.com</a>]
<br>
<b>Sent:</b> Tuesday, December 08, 2015 8:22 AM</span></p>
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<p class="MsoNormal"><br>
<b>To:</b> Kenji Tsumura<br>
<b>Cc:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>Subject:</b> Re: [vtkusers] vtkVolumeProperty IndependentComponents On and Off</p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">That would be great Kenji, thanks. </p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">- Aashish</p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">On Mon, Dec 7, 2015 at 5:29 PM, Kenji Tsumura <<a href="mailto:kenji.tsumura@neosoftmedical.com" target="_blank">kenji.tsumura@neosoftmedical.com</a>> wrote:</p>
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<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Aashish,</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thank you very much.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">I will try to run the test example and see what happens.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">If the test is ok, I will try to reproduce the problem with simpler code.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Kenji</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Aashish Chaudhary [mailto:<a href="mailto:aashish.chaudhary@kitware.com" target="_blank">aashish.chaudhary@kitware.com</a>]
<br>
<b>Sent:</b> Monday, December 07, 2015 3:58 PM</span></p>
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<p class="MsoNormal" style=""><br>
<b>To:</b> Kenji Tsumura<br>
<b>Cc:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>Subject:</b> Re: [vtkusers] vtkVolumeProperty IndependentComponents On and Off</p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">Thanks Kenji for trying out. Its not clear in the log why the build shader code crashed. </p>
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<p class="MsoNormal" style="">Also, I realized that you using Java bindings. Would it be possible to re-create this issue</p>
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<p class="MsoNormal" style="">with a small sample code and you send it to me? We do have two component and 4 component</p>
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<p class="MsoNormal" style="">test (dependent and independent). Please have a look here: <a href="https://github.com/Kitware/VTK/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastTwoComponentsIndependent.cxx" target="_blank">https://github.com/Kitware/VTK/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastTwoComponentsIndependent.cxx</a></p>
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<div>
<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">and </p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style=""><a href="https://github.com/Kitware/VTK/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastTwoComponentsDependent.cxx" target="_blank">https://github.com/Kitware/VTK/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastTwoComponentsDependent.cxx</a></p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">Thanks,</p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">On Mon, Dec 7, 2015 at 3:41 PM, Kenji Tsumura <<a href="mailto:kenji.tsumura@neosoftmedical.com" target="_blank">kenji.tsumura@neosoftmedical.com</a>> wrote:</p>
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<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Hi Aashish,</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thank you.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">I tried with vtkGPUVolumeRayCastMapper.
</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">An error occurs without setting IndependentComponentsOff.</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">It seems the error occurs in vtkOpenGLGPUVolumeRayCastMapper::BuildShader (See the attached file).</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Kenji</span></p>
<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Aashish Chaudhary [mailto:<a href="mailto:aashish.chaudhary@kitware.com" target="_blank">aashish.chaudhary@kitware.com</a>]
<br>
<b>Sent:</b> Monday, December 07, 2015 1:54 PM<br>
<b>To:</b> Kenji Tsumura<br>
<b>Cc:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>Subject:</b> Re: [vtkusers] vtkVolumeProperty IndependentComponents On and Off</span></p>
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<div>
<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">On Mon, Dec 7, 2015 at 12:19 PM, Kenji Tsumura <<a href="mailto:kenji.tsumura@neosoftmedical.com" target="_blank">kenji.tsumura@neosoftmedical.com</a>> wrote:</p>
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<p class="MsoNormal" style="">Hello,</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">I have 3D cardiac MRI data (magnitude data and velocity data), and would like to display the volume rendering of the two data.</p>
<p class="MsoNormal" style="">I create vtkVolume with two components (first one is velocity data and second one is magnitude data) and use vtkSmartVolumeMapper.</p>
<p class="MsoNormal" style="">When I set IndependentComponentsOn to the volume property, I can see what I want (refer to the first figure).</p>
<p class="MsoNormal" style="">But this setting disables GPU rendering and it is slow.</p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">I don't remember vtkSmartVolumeMapper has this logic, I will have a look. In the old GPU raycast mapper, there was some issue with independent components so may be that is the reason that smart volume mapper switched to fixed point
ray cast. </p>
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<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">Is there a particular reason you are using vtkSmartVolumeMapper? You can directly use GPUVolume RayCastMapper</p>
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<p class="MsoNormal" style=""> </p>
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<blockquote style="border:none; border-left:solid #CCCCCC 1.0pt; padding:0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; margin-bottom:5.0pt">
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<p class="MsoNormal" style="">My understanding is that I have to use IndependentComponentsOff to make the mapper use GPU rendering.</p>
<p class="MsoNormal" style="">When I set IndependentComponentsOff, only one color transfer function, and only one scalar opacity function to the volume property,</p>
<p class="MsoNormal" style="">the magnitude data (the second component) is also color-coded (refer to the second figure).</p>
<p class="MsoNormal" style="">I thought this contradicts the method comments of IndependentComponentsOn/ IndependentComponentsOff.</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">“For 2 component data, the first is passed through the first color transfer function and the second component is passed through the first opacity transfer function.”</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">Am I missing something?</p>
<p class="MsoNormal" style="">Can I make the volume rendering look the same as using two components?</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">Thank you,</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">BTY, I use v6.3.0, OpenGL2.</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">-- </p>
<p class="MsoNormal" style="">Kenji Tsumura</p>
<p class="MsoNormal" style=""> </p>
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<p class="MsoNormal" style="">-- </p>
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<p class="MsoNormal" style=""><i><span style="font-family:"Trebuchet MS","sans-serif"">| Aashish Chaudhary
<br>
| Technical Leader <br>
| Kitware Inc. </span></i></p>
<div>
<p class="MsoNormal" style=""><i><span style="font-family:"Trebuchet MS","sans-serif"">| </span><a href="http://www.kitware.com/company/team/chaudhary.html" target="_blank">http://www.kitware.com/company/team/chaudhary.html</a></i></p>
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<p class="MsoNormal" style="">-- </p>
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<p class="MsoNormal" style=""><i><span style="font-family:"Trebuchet MS","sans-serif"">| Aashish Chaudhary
<br>
| Technical Leader <br>
| Kitware Inc. </span></i></p>
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<p class="MsoNormal" style=""><i><span style="font-family:"Trebuchet MS","sans-serif"">| Aashish Chaudhary
<br>
| Technical Leader <br>
| Kitware Inc. </span></i></p>
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<p class="MsoNormal" style=""><i><span style="font-family:"Trebuchet MS","sans-serif"">| </span><a href="http://www.kitware.com/company/team/chaudhary.html" target="_blank">http://www.kitware.com/company/team/chaudhary.html</a></i></p>
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<p class="MsoNormal">-- </p>
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<p class="MsoNormal"><i><span style="font-family:"Trebuchet MS","sans-serif"">| Aashish Chaudhary
<br>
| Technical Leader <br>
| Kitware Inc. </span></i></p>
<div>
<p class="MsoNormal"><i><span style="font-family:"Trebuchet MS","sans-serif"">| </span><a href="http://www.kitware.com/company/team/chaudhary.html" target="_blank">http://www.kitware.com/company/team/chaudhary.html</a></i></p>
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<p class="MsoNormal">-- </p>
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<p class="MsoNormal"><i><span style="font-family:"Trebuchet MS","sans-serif"">| Aashish Chaudhary
<br>
| Technical Leader <br>
| Kitware Inc. </span></i></p>
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<p class="MsoNormal"><i><span style="font-family:"Trebuchet MS","sans-serif"">| </span><a href="http://www.kitware.com/company/team/chaudhary.html" target="_blank">http://www.kitware.com/company/team/chaudhary.html</a></i></p>
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