[vtkusers] vtkVolumeProperty IndependentComponents On and Off

[Aashish Chaudhary]

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
>
>
>
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> --
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>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
>
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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