[vtkusers] vtkVolumeTextureMapper3D in VTK 7.1?

Tue May 30 04:24:00 EDT 2017

Hello Alvarez,

Thanks for your answers!

About the ray sampling being clamp by the
Minimum/MaximumImageSampleDistance, it is now done from lines 3318 to 3325,
here :
https://github.com/Kitware/VTK/blob/master/Rendering/VolumeOpenGL2/vtkOpenGLGPUVolumeRayCastMapper.cxx#L3318

Good to hear that you have some plan to make use of both XY image sampling
and ray sampling during interaction, I believe it can improve quite a lot
the quality of the image for the same FPS if it is correctly tuned.

Simon

2017-05-26 15:03 GMT+02:00 Alvaro Sanchez <alvaro.sanchez at kitware.com>:

> 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 out of date.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
>

-- 
------------------------------------------------------------------
Simon Esneault
Rennes, France
------------------------------------------------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20170530/1451364a/attachment.html>