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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thank for the advice.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Now I can see volume rendering in both my application and test program with gradient option.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">When I run, the console output program source code in the attached file.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Is this because I am using latest VTK?</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 1:43 PM<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">Make sure that your gradient opacity function is set correctly (or as expected). I believe you are going from 0.0 - 0.5. Can you change it to 0.2 - 0.5 and see if something shows up? </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 Wed, Dec 9, 2015 at 2:39 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">I tried, but both my application and the test program doesn’t work with gradient opacity.

</span></p>

<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">The display window were black.</span></p>

<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">There is no apparent error…</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"> </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> Wednesday, December 09, 2015 12:44 PM</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="">Kenji, </p>

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<p class="MsoNormal" style=""> </p>

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<p class="MsoNormal" style="">Can you try the latest patch? Undo the last patch before you apply this patch: </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 Wed, Dec 9, 2015 at 1:35 PM, 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" style="">Let me check.. scalarsRange is the local variables (float) type. I tested it on my Linux box and things were</p>

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<p class="MsoNormal" style="">fine but it is possible that gcc failed to catch it. </p>

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<p class="MsoNormal" style=""> </p>

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<p class="MsoNormal" style="">On Wed, Dec 9, 2015 at 1:25 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">I applied the patch to the latest VTK (from GIT) and rebuilt it.</span></p>

<p class="MsoNormal" style=""><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" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Please find the attached file.</span></p>

<p class="MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">I am not sure why…</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"> </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> Wednesday, December 09, 2015 9:04 AM</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="">Hi Kenji, </p>

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<p class="MsoNormal" style=""> </p>

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<p class="MsoNormal" style="">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" 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 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" style="">Aha... I think I know how to fix the bug.  Gradient opacity was the key. I will push a fix today. </p>

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<p class="MsoNormal" style=""> </p>

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<p class="MsoNormal" style=""><span style="color:#888888">- Aashish</span></p>

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<p class="MsoNormal" style=""> </p>

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<p class="MsoNormal" style="">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" 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="">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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<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>]

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<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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<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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<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>

<p class="MsoNormal" style="">“The information contained in this communication may be confidential, is intended only for the use of the recipient(s) named above, and may be legally privileged. If the reader of this message is not the intended recipient, you

 are hereby notified that any dissemination, distribution, or copying of this communication, or any of its contents, is strictly prohibited. If you have received this communication in error, please return it to the sender immediately and delete the original

 message and any copy of it from your computer system. If you have any questions concerning this message, please contact the sender.</p>

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<p class="MsoNormal" style="">Disclaimer: The information contained in this communication may be confidential, is intended only for the use of the recipient(s) named above, and may be legally privileged. If the reader of this message is not the intended recipient,

 you are hereby notified that any dissemination, distribution, or copying of this communication, or any of its contents, is strictly prohibited. If you have received this communication in error, please return it to the sender immediately and delete the original