[vtkusers] vtkVolumeProperty IndependentComponents On and Off

Aashish Chaudhary aashish.chaudhary at kitware.com
Wed Dec 9 15:01:00 EST 2015 

Hi Kenji,

That's just my patch in case you had to send me what shader we were
generating. You can
ignore this as in my branch to VTK, I will remove it. Make sure that your
gradients are matching
with gradient opacity values or else you would not see anything or will see
unexpected color
and opacity.

- aashish

On Wed, Dec 9, 2015 at 2:58 PM, Kenji Tsumura <
kenji.tsumura at neosoftmedical.com> wrote:

> Thank for the advice.
>
> Now I can see volume rendering in both my application and test program
> with gradient option.
>
> When I run, the console output program source code in the attached file.
>
> Is this because I am using latest VTK?
>
>
>
> Thank you,
>
>
>
> Kenji
>
>
>
> *From:* Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> *Sent:* Wednesday, December 09, 2015 1:43 PM
>
> *To:* Kenji Tsumura
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtkVolumeProperty IndependentComponents On and
> Off
>
>
>
> 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?
>
>
>
> Thanks,
>
>
>
>
>
> On Wed, Dec 9, 2015 at 2:39 PM, Kenji Tsumura <
> kenji.tsumura at neosoftmedical.com> wrote:
>
> Hi Aashish,
>
>
>
> I tried, but both my application and the test program doesn’t work with
> gradient opacity.
>
> The display window were black.
>
> There is no apparent error…
>
>
>
> Thank you,
>
>
>
> Kenji
>
>
>
> *From:* Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> *Sent:* Wednesday, December 09, 2015 12:44 PM
>
>
> *To:* Kenji Tsumura
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtkVolumeProperty IndependentComponents On and
> Off
>
>
>
> Kenji,
>
>
>
> Can you try the latest patch? Undo the last patch before you apply this
> patch:
>
>
>
> Thanks,
>
>
>
>
>
> On Wed, Dec 9, 2015 at 1:35 PM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
> Let me check.. scalarsRange is the local variables (float) type. I tested
> it on my Linux box and things were
>
> fine but it is possible that gcc failed to catch it.
>
>
>
> On Wed, Dec 9, 2015 at 1:25 PM, Kenji Tsumura <
> kenji.tsumura at neosoftmedical.com> wrote:
>
> Hi Aashish,
>
>
>
> I applied the patch to the latest VTK (from GIT) and rebuilt it.
>
> An error occurred when I run the test program you gave me without gradient
> opacity.
>
> Please find the attached file.
>
> I am not sure why…
>
>
>
> Thank you,
>
>
>
> Kenji
>
>
>
> *From:* Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> *Sent:* Wednesday, December 09, 2015 9:04 AM
>
>
> *To:* Kenji Tsumura
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtkVolumeProperty IndependentComponents On and
> Off
>
>
>
> Hi Kenji,
>
>
>
> Could you please try the attached patch? Once if works for you, I will
> clean it up and create a merge request.
>
>
>
> Thanks,
>
>
>
>
>
> On Tue, Dec 8, 2015 at 11:41 AM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
> Aha... I think I know how to fix the bug.  Gradient opacity was the key. I
> will push a fix today.
>
>
>
> - Aashish
>
>
>
> On Tue, Dec 8, 2015 at 11:30 AM, Kenji Tsumura <
> kenji.tsumura at neosoftmedical.com> wrote:
>
> Hi Aashish,
>
>
>
> Adding gradient opacity to the test sample causes the same error I have
> seen in my application.
>
> Please refer to the attached file.
>
> So my application works with IndependentComponents On after removing
> gradient opacity.
>
>
>
> Kenji
>
>
>
> *From:* Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> *Sent:* Tuesday, December 08, 2015 8:22 AM
>
>
> *To:* Kenji Tsumura
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtkVolumeProperty IndependentComponents On and
> Off
>
>
>
> That would be great Kenji, thanks.
>
>
>
> - Aashish
>
>
>
> On Mon, Dec 7, 2015 at 5:29 PM, Kenji Tsumura <
> kenji.tsumura at neosoftmedical.com> wrote:
>
> Aashish,
>
>
>
> Thank you very much.
>
> I will try to run the test example and see what happens.
>
> If the test is ok, I will try to reproduce the problem with simpler code.
>
>
>
> Kenji
>
>
>
> *From:* Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> *Sent:* Monday, December 07, 2015 3:58 PM
>
>
> *To:* Kenji Tsumura
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtkVolumeProperty IndependentComponents On and
> Off
>
>
>
> Thanks Kenji for trying out. Its not clear in the log why the build shader
> code crashed.
>
> Also, I realized that you using Java bindings. Would it be possible to
> re-create this issue
>
> with a small sample code and you send it to me? We do have two component
> and 4 component
>
> test (dependent and independent). Please have a look here:
> https://github.com/Kitware/VTK/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastTwoComponentsIndependent.cxx
>
>
>
> and
>
>
>
>
> https://github.com/Kitware/VTK/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastTwoComponentsDependent.cxx
>
>
>
>
>
> Thanks,
>
>
>
>
>
> On Mon, Dec 7, 2015 at 3:41 PM, Kenji Tsumura <
> kenji.tsumura at neosoftmedical.com> wrote:
>
> Hi Aashish,
>
>
>
> Thank you.
>
> I tried with vtkGPUVolumeRayCastMapper.
>
> An error occurs without setting IndependentComponentsOff.
>
> It seems  the error occurs in vtkOpenGLGPUVolumeRayCastMapper::BuildShader
> (See the attached file).
>
>
>
> Kenji
>
>
>
> *From:* Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> *Sent:* Monday, December 07, 2015 1:54 PM
> *To:* Kenji Tsumura
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtkVolumeProperty IndependentComponents On and
> Off
>
>
>
>
>
>
>
> On Mon, Dec 7, 2015 at 12:19 PM, Kenji Tsumura <
> kenji.tsumura at neosoftmedical.com> wrote:
>
> Hello,
>
>
>
> I have 3D cardiac MRI data (magnitude data and velocity data), and would
> like to display the volume rendering of the two data.
>
> I create vtkVolume with two components  (first one is velocity data and
> second one is magnitude data) and use vtkSmartVolumeMapper.
>
> When I set IndependentComponentsOn to the volume property, I can see what
> I want (refer to the first figure).
>
> But this setting disables GPU rendering and it is slow.
>
>
>
> 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.
>
>
>
> Is there a particular reason you are using vtkSmartVolumeMapper?  You can
> directly use GPUVolume RayCastMapper
>
>
>
> My understanding is that I have to use IndependentComponentsOff to make
> the mapper use GPU rendering.
>
> When I set IndependentComponentsOff, only one color transfer function, and
> only one scalar opacity function to the volume property,
>
> the magnitude data (the second component) is also color-coded (refer to
> the second figure).
>
> I thought this contradicts the method comments of IndependentComponentsOn/
> IndependentComponentsOff.
>
>
>
> “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.”
>
>
>
> Am I missing something?
>
> Can I make the volume rendering look the same as using two components?
>
>
>
> Thank you,
>
>
>
> BTY, I use v6.3.0, OpenGL2.
>
>
>
> --
>
> Kenji Tsumura
>
>
>
> “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.
>
> 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 message
> and any copy of it from your computer system. If you have any questions
> concerning this message, please contact the sender.
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Search the list archives at: http://markmail.org/search/?q=vtkusers
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/vtkusers
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
> 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 message
> and any copy of it from your computer system. If you have any questions
> concerning this message, please contact the sender.
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
> 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 message
> and any copy of it from your computer system. If you have any questions
> concerning this message, please contact the sender.
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
> 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 message
> and any copy of it from your computer system. If you have any questions
> concerning this message, please contact the sender.
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
> 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 message
> and any copy of it from your computer system. If you have any questions
> concerning this message, please contact the sender.
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
> 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 message
> and any copy of it from your computer system. If you have any questions
> concerning this message, please contact the sender.
>
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
> 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 message
> and any copy of it from your computer system. If you have any questions
> concerning this message, please contact the sender.
>



-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20151209/9700c06e/attachment.html>

More information about the vtkusers mailing list