[vtkusers] vtkVolumeProperty IndependentComponents On and Off

Aashish Chaudhary aashish.chaudhary at kitware.com
Mon Dec 7 14:53:44 EST 2015


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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-- 



*| 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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