[vtkusers] Rendering of deformable volumentric data

[David Gobbi]

Hi Dirk,

The only way to do this as fast as you would need, is to modify an
existing vtkVolumeMapper.  I would advise against CUDA since
VTK does not use CUDA, so you would have to start from scratch.
If you go with shaders, then you can use vtkGPUVolumeMapper
as a starting point and add a texture that describes the deformation.

 - David


On Wed, Mar 9, 2011 at 2:21 AM, Dirk Fortmeier
<fortmeier at imi.uni-luebeck.de> wrote:
> Hi David,
>
> that worked as well :) Thanks. I see, this method really isn't as fast
> as I need it to be. Since I will only have to deform small parts of the
> image data and I need interactivity I probably will have to write some
> code, maybe some GPU code... Can I write CUDA Code for this or do I have
> to write a shader? Is there a way to work with vtkImageData on the GPU?
>
> Regards,
> Dirk
>
> On Tue, 2011-03-08 at 05:38 -0700, David Gobbi wrote:
>> You should be able to do this by calling Modified() on any of these:
>> vtkImageReslice, vtkGridTransform, or the vtkImageData.  You
>> probably won't achieve real interactive speeds, though.  For that
>> you would have to write a volume mapper that applies the deformation
>> as part of the ray cast operation.
>>
>>  - David
>>
>>
>> On Tue, Mar 8, 2011 at 4:31 AM, Dirk Fortmeier
>> <fortmeier at imi.uni-luebeck.de> wrote:
>> > Hi David,
>> >
>> > thanks for the reply, worked out of the box. Now I have the problem that
>> > changing the displacement grid interactively does not result in a newly
>> > deformed volume. How do I force the pipeline to update?
>> >
>> > Regards,
>> > Dirk
>> >
>> > On Mon, 2011-03-07 at 13:56 -0700, David Gobbi wrote:
>> >> Hi Dirk,
>> >>
>> >> The vtkGridTransform is can be used to deform a volume, and I have
>> >> also written a B-spline transform for VTK that you can find in the VTK
>> >> Journal.  You can deform the volume with vtkImageReslice (by setting
>> >> the ResliceTransform to a deformable transformation), and then pass the
>> >> output of vtkImageReslice to a volume mapper.
>> >>
>> >>  - David
>> >>
>> >>
>> >> On Mon, Mar 7, 2011 at 3:16 AM, Dirk Fortmeier
>> >> <fortmeier at imi.uni-luebeck.de> wrote:
>> >> > Hi all,
>> >> >
>> >> > is there already a way in vtk or vtk-edge to render deformed volumetric
>> >> > objects (using a lattice or a field of displacements for instance)? Did
>> >> > someone on the list tried to implement something like that?
>> >> >
>> >> > Regards,
>> >> > Dirk
>> >> > --
>> >> > Dirk Fortmeier <fortmeier at imi.uni-luebeck.de>, PhD Student
>> >> >
>> >> > Institute of Medical Informatics
>> >> > Graduate School for Computing in Medicine and Life Sciences
>> >> > University of Lübeck
>> >> >
>> >> > Building 64, 2F, Room 4
>> >> > Ratzeburger Allee 160
>> >> > 23538 Lübeck
>> >> > Germany
>> >> >
>> >> > Tel.:+49 (451) 500-5635
>> >> > Fax.:+49 (451) 500-5610
>> >> >
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>> >
>> > --
>> > Dirk Fortmeier <fortmeier at imi.uni-luebeck.de>, PhD Student
>> >
>> > Institute of Medical Informatics
>> > Graduate School for Computing in Medicine and Life Sciences
>> > University of Lübeck
>> >
>> > Building 64, 2F, Room 4
>> > Ratzeburger Allee 160
>> > 23538 Lübeck
>> > Germany
>> >
>> > Tel.:+49 (451) 500-5635
>> > Fax.:+49 (451) 500-5610
>> >
>> >
>
> --
> Dirk Fortmeier <fortmeier at imi.uni-luebeck.de>, PhD Student
>
> Institute of Medical Informatics
> Graduate School for Computing in Medicine and Life Sciences
> University of Lübeck
>
> Building 64, 2F, Room 4
> Ratzeburger Allee 160
> 23538 Lübeck
> Germany
>
> Tel.:+49 (451) 500-5635
> Fax.:+49 (451) 500-5610
>
>