[vtk-developers] Multiple overlapping volumes

[Steve Pieper]

Hi Elvis -

I'm really happy to see all the progress in vtk.js and want to pool
resources to avoid divergent/redundant work.  I haven't had a chance to
look yet at what it would take to integrate the multivolume rendering with
vtk.js but I'm sure something is possible.  The complex parts are managing
the opengl state and generating the GLSL code on the fly (metaprogramming)
to manage resources and composite during ray integration.  Would love to
work with people on this.

-Steve


On Mon, Feb 26, 2018 at 12:22 PM, Elvis Stansvik <
elvis.stansvik at orexplore.com> wrote:

> Thanks for responding Steve, and for the links. Very interesting.
>
> Did you consider using VTK.js for your Slicer/WebGL experiment, or was it
> not mature enough at the time?
>
> (We have (very) preliminary plans for a web version of our program, and it
> would be great if VTK.js gained mixed/intersecting volume support just like
> VTK recently did.)
>
> Elvis
>
> Den 26 feb. 2018 4:40 em skrev "Steve Pieper" <pieper at isomics.com>:
>
>> Hi Guys -
>>
>> That video was made using some code I've been playing with for a while
>> [1] to see how much of a program like Slicer could be implemented in
>> JavaScript and WebGL(2).  The web environment is very powerful and it's
>> great to see vtk.js develop.
>>
>> We've also looked a bit at what it would take to make libraries of GLSL
>> code that could work in either desktop OpenGL or WebGL (the CommonGL idea
>> [2]).
>>
>> Best,
>> Steve
>>
>> [1] https://github.com/pieper/sites/tree/gh-pages/step
>>
>> [2] https://public.kitware.com/pipermail/vtk-developers/2015
>> -June/032132.html
>>
>> On Mon, Feb 26, 2018 at 9:52 AM, Sebastien Jourdain <
>> sebastien.jourdain at kitware.com> wrote:
>>
>>> Hi Elvis,
>>>
>>> Regarding vtk.js, the video you shared wasn't based on vtk.js. But
>>> vtk.js does support mix of geometries and a volume. Although, right now,
>>> you can not mix volumes.
>>>
>>> HTH,
>>>
>>> Seb
>>>
>>> On Mon, Feb 26, 2018 at 3:23 AM, Elvis Stansvik <
>>> elvis.stansvik at orexplore.com> wrote:
>>>
>>>> 2018-02-26 10:06 GMT+01:00 Elvis Stansvik <elvis.stansvik at orexplore.com
>>>> >:
>>>> > Hi folks,
>>>> >
>>>> > I think I asked about support for rendering multiple overlapping
>>>> > volumes a couple of years ago, but can't find the mail.
>>>> >
>>>> > I just came across this wiki page from June last year:
>>>> >
>>>> >     https://na-mic.org/wiki/Project_Week_25/Next_Generation_GPU
>>>> _Volume_Rendering
>>>> >
>>>> > It mentions that "Multiple volume support is in development at
>>>> > Kitware" and lists "Overlapping volumes - multiple inputs to mapper"
>>>> > under "Work in progress".
>>>> >
>>>> > I'm just curious if that work was continued or put on hold.
>>>>
>>>> I should have checked Git history before sending this mail. I now found
>>>>
>>>>     https://gitlab.kitware.com/vtk/vtk/commit/a632f77e3fa955dbf1
>>>> 7813a803ddae43a9675021
>>>>
>>>> "Added support for multiple volume inputs in GPUVolumeRayCastMapper".
>>>>
>>>> This is fantastic news! I shall experiment with it ASAP.
>>>>
>>>> Elvis
>>>>
>>>> >
>>>> > I also found https://www.youtube.com/watch?
>>>> time_continue=28&v=ML9_JWAz1kY
>>>> > which shows a proof-of-concept in WebGL (uploaded by Steve Pieper).
>>>> > Anyone know if the code for that experiment is available? Was it done
>>>> > using/on top of VTK.js?
>>>> >
>>>> > Best regards,
>>>> > Elvis
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>>>
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