[vtkusers] vtkVolumeTextureMapper3D in VTK 7.1?

Fri May 26 09:03:50 EDT 2017

Hi Simon,

sorry for the delay.

- Will this work as well with real number, not only integers ? Let's say an
> ImageSampleDistance of 1.4 ? Like it is possible for the
> FixedRayCastVolumeMapper.
>

Yes, supports real numbers.

> - Will there be a mechanism that can make some use of this during
> interaction, like the Fixed ray cast mapper ? There are these methods
> called SetMinimumImageSampleDistance/SetMaximumImageSampleDistance,
> together used with the SetInteractiveSampleDistance they gives us a great
> flexibility over the tuning of the rendering during interaction. Will there
> be an equivalent mechanism with the GPU implementation ?
>

This is not currently supported in the GPU implementation. One thing we
need to review is the current
implementation of UpdateSamplingDistance, to ensure it makes use of
ImageSampleDistance (xy-sampling)
as well,  not only SampleDistance (ray-sampling distance).  Adding a
mechanism similar to that in
FixedRayCastMapper would make sense.

> - I always found the naming ImageSampleDistance quite confusing, shouldn't
> that be renamed to ImageSampling or something else to avoid confusion with
> the SamplingDistance ? RenderedImageSampling/FinalImageSampling vs
> RaySampling ?
>

It is indeed confusing at first glance, it has remained like that for
historical reasons I guess. It would probably
make sense to review the API of GPURayCast at some point.

> - The current implementation is mixing the 2 parameters, it looks like the
> SamplingDistance along the ray is clamped using the
> Minimum/MaximumImageSampleDistance right now (line 3008 of
> the vtkOpenGLGPUVolumeRayCastMapper.cxx). Is this intended ?
>

I could not find the line you are referring to, might be that the code is
out of date. Could you look again in
the code and tell me if you still can see this?

> - Does that works with the jittering option enabled ?
>

Yes, this should work with jittering on.

Cheers!

On Thu, Apr 6, 2017 at 4:28 AM, Simon Esneault <simon.esneault at gmail.com>
wrote:

> Hello Alvaro
>
> Thanks for your work, this looks promising !!
> I have a few questions:
>
> - Will this work as well with real number, not only integers ? Let's say
> an ImageSampleDistance of 1.4 ? Like it is possible for the
> FixedRayCastVolumeMapper.
>
> - Will there be a mechanism that can make some use of this during
> interaction, like the Fixed ray cast mapper ? There are these methods
> called SetMinimumImageSampleDistance/SetMaximumImageSampleDistance,
> together used with the SetInteractiveSampleDistance they gives us a great
> flexibility over the tuning of the rendering during interaction. Will there
> be an equivalent mechanism with the GPU implementation ?
>
> - I always found the naming ImageSampleDistance quite confusing, shouldn't
> that be renamed to ImageSampling or something else to avoid confusion with
> the SamplingDistance ? RenderedImageSampling/FinalImageSampling vs
> RaySampling ?
>
> - The current implementation is mixing the 2 parameters, it looks like the
> SamplingDistance along the ray is clamped using the
> Minimum/MaximumImageSampleDistance right now (line 3008 of
> the vtkOpenGLGPUVolumeRayCastMapper.cxx). Is this intended ?
>
> - Does that works with the jittering option enabled ?
>
> Thanks a lot for that work, we will benefit a lot from that :)
>
> Simon
>
> 2017-03-31 18:34 GMT+02:00 Alvaro Sanchez <alvaro.sanchez at kitware.com>:
>
>> Here is the merge request:
>>
>> https://gitlab.kitware.com/vtk/vtk/merge_requests/2641
>>
>> On Wed, Mar 8, 2017 at 11:08 AM, Alvaro Sanchez <
>> alvaro.sanchez at kitware.com> wrote:
>>
>>> Thanks for the interest. There is no branch yet but I will ping you once
>>> you can try it out.
>>>
>>> > Also in that case would it be possible to add a final "gaussian
>>> smoothing
>>> > pass" or equivalent only on the 2D generated image (maybe only as an
>>> option)
>>>
>>> The first version will most likely only support linear interpolation,
>>> but will keep this in mind.
>>>
>>>
>>> On Wed, Mar 8, 2017 at 8:04 AM, Elvis Stansvik <
>>> elvis.stansvik at orexplore.com> wrote:
>>>
>>>> 2017-03-08 11:16 GMT+01:00 Simon ESNEAULT <simon.esneault at gmail.com>:
>>>> > Hello Alvaro,
>>>> >
>>>> > That's real good news to hear (about the down-sampling in X and Y), I
>>>> find
>>>> > it really difficult to tweak volume rendering only with sample
>>>> distance,
>>>> > especially during interaction.
>>>> > Has the development began already ? Is there some branche where we
>>>> can test
>>>> > that feature ?
>>>> >
>>>> > Also in that case would it be possible to add a final "gaussian
>>>> smoothing
>>>> > pass" or equivalent only on the 2D generated image (maybe only as an
>>>> option)
>>>> > ? I look like it is the case with FixedPointVolumeraycastMapper, the
>>>> image
>>>> > looks a bit blurred but sometimes it helps to see the structures
>>>>
>>>> I'm also very interested in this. I'm using vtkGPUVolumeRayCastMapper,
>>>> and I'm currently turning off the automatic adjustment of sample
>>>> distance during interaction and resorted to doing my own simpler
>>>> adjustment. I'm simply quadrupling the sample distance during
>>>> interaction (for still rendering I use
>>>> (spacingX+spacingY+spacingZ)/6). I'd love to have another quality
>>>> controlling knob to turn.
>>>>
>>>> Is there a MR up for it already? Will it be in 7.2?
>>>>
>>>> Elvis
>>>>
>>>> >
>>>> > Thanks
>>>> > Simon
>>>> >
>>>> >
>>>> > 2017-03-06 18:17 GMT+01:00 Alvaro Sanchez <alvaro.sanchez at kitware.com
>>>> >:
>>>> >>
>>>> >> Hi Shark,
>>>> >>
>>>> >> unfortunately there is no current plan of porting
>>>> vtkVolumeTextureMapper3D
>>>> >> to OpenGL2
>>>> >> , as far as I know.  We will soon however support image down
>>>> sampling in X
>>>> >> and Y which
>>>> >> should serve as additional knobs to tweak the performance of
>>>> >> GPURayCastMapper in
>>>> >> OpenGL2 (only sample distance can be currently adjusted).
>>>> >>
>>>> >> Could you provide more detail on the size of the dataset you are
>>>> rendering
>>>> >> and your GPU
>>>> >> specs?
>>>> >>
>>>> >> Thanks,
>>>> >> Álvaro
>>>> >>
>>>> >> On Mon, Mar 6, 2017 at 10:30 AM, Shark <m.nunes at fratoria.com> wrote:
>>>> >>>
>>>> >>> Hello,
>>>> >>>
>>>> >>> I have been having some issues with vtkVolumeTextureMapper3D. I see
>>>> it
>>>> >>> has
>>>> >>> been deprecated, however it is still available if I use the old
>>>> openGL.
>>>> >>>
>>>> >>> Since for software rendering with texture mapping is much faster
>>>> than ray
>>>> >>> casting, I would like to know if you are planning to have a Volume
>>>> >>> Texture
>>>> >>> Mapper for openGL 2, or if there is actually a new one that I am
>>>> not able
>>>> >>> to
>>>> >>> find.
>>>> >>>
>>>> >>> Best regards,
>>>> >>> Shark
>>>> >>>
>>>> >>>
>>>> >>>
>>>> >>>
>>>> >>> --
>>>> >>> View this message in context:
>>>> >>> http://vtk.1045678.n5.nabble.com/vtkVolumeTextureMapper3D-in
>>>> -VTK-7-1-tp5742368.html
>>>> >>> Sent from the VTK - Users mailing list archive at Nabble.com.
>>>> >>> _______________________________________________
>>>> >>> 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
>>>> >>
>>>> >>
>>>> >>
>>>> >>
>>>> >> --
>>>> >> Alvaro Sanchez
>>>> >> Kitware, Inc.
>>>> >> Senior R&D Engineer
>>>> >> 21 Corporate Drive
>>>> >> Clifton Park, NY 12065-8662
>>>> >> Phone: 518-881-4901
>>>> >>
>>>> >> _______________________________________________
>>>> >> 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
>>>> >>
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > ------------------------------------------------------------------
>>>> > Simon Esneault
>>>> > Rennes, France
>>>> > ------------------------------------------------------------------
>>>> >
>>>> > _______________________________________________
>>>> > 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
>>>> >
>>>>
>>>
>>>
>>>
>>> --
>>> Alvaro Sanchez
>>> Kitware, Inc.
>>> Senior R&D Engineer
>>> 21 Corporate Drive
>>> Clifton Park, NY 12065-8662
>>> Phone: 518-881-4901 <(518)%20881-4901>
>>>
>>
>>
>>
>> --
>> Alvaro Sanchez
>> Kitware, Inc.
>> Senior R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4901 <(518)%20881-4901>
>>
>
>
>
> --
> ------------------------------------------------------------------
> Simon Esneault
> Rennes, France
> ------------------------------------------------------------------
>

-- 
Alvaro Sanchez
Kitware, Inc.
Senior R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4901
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