[Imstk-developers] Copying Vega data

[Alexis Girault]

Here is how VTK offered to improve mapping volumetric meshes or just data
arrays: http://www.vtk.org/Wiki/VTK/InSituDataStructures

The MappedDataArray (that we tried to use and that Nich got rid of because
of huge overhead cost when calling getVoidPointer in the VBO creation) is
actually deprecated and will be removed in the future. The next iteration
of this functionality which focuses on performance improvements is
presented in this article
https://blog.kitware.com/new-data-array-layouts-in-vtk-7-1/ and detailed on
this wiki page: http://www.vtk.org/Wiki/VTK/Tutorials/DataArrays

If we can improve the renderer and mapper to do what's needed, I believe
we'll be able to use this new data array layouts to reduce data structure
conversion overhead.

Alexis Girault
R&D Engineer in Medical Computing
Kitware, Inc.

http://www.kitware.com
(919) 969-6990 x325

On Thu, Oct 20, 2016 at 6:01 PM, Sreekanth Arikatla <
sreekanth.arikatla at kitware.com> wrote:

> Hi Nick,
>             Yes, that can be done (I was under the impression that even
> that operation was slow with vtk but haven't looked into that part myself).
> The copy could additionally be made conditional since rendering typically
> runs faster than the physics.
>
> The mesh needs to be updated though (at least in the case where visual and
> physics are the same) since the physics update of future time steps count
> on it.
>
> On Thu, Oct 20, 2016 at 4:04 PM, Milef, Nicholas Boris <milefn at rpi.edu>
> wrote:
>
>> In that case, then copying data over shouldn't be a big deal. I thought
>> the copying was occurring on the rendering thread. If we need thread
>> synchronization here, then we can just use a buffered approach.
>> ------------------------------
>> *From:* Sreekanth Arikatla [sreekanth.arikatla at kitware.com]
>> *Sent:* Thursday, October 20, 2016 3:53 PM
>> *To:* Milef, Nicholas Boris
>> *Cc:* imstk-developers at imstk.org
>> *Subject:* Re: [Imstk-developers] Copying Vega data
>>
>> Hi Nick,
>>            It happens in a separate thread in the sceneManager module.
>>
>> On Thu, Oct 20, 2016 at 3:45 PM, Milef, Nicholas Boris <milefn at rpi.edu
>> <http://redir.aspx?REF=BpJFDzylJUzmyH0IS2ouZR58VfSo4ijMtYN4jcu2cDKtIV1CJPnTCAFtYWlsdG86bWlsZWZuQHJwaS5lZHU.>
>> > wrote:
>>
>>> Do Vega operations occur on the same thread as the render loop? If not,
>>> then it might be best to buffer and copy over the data instead of directly
>>> working on the mesh data.
>>>
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>>
>>
>> --
>> Sreekanth Arikatla, Ph.D,
>> Senior R&D Engineer,
>> Kitware, Inc.
>> <http://redir.aspx?REF=3qzFo3FNN4RdtBUk0qOs5JodPEA_-jpKD8tsMGEYn26tIV1CJPnTCAFodHRwOi8vd3d3LmtpdHdhcmUuY29t>,
>> Carrboro, NC.
>>
>>
>
>
> --
> Sreekanth Arikatla, Ph.D,
> Senior R&D Engineer,
> Kitware, Inc. <http://www.kitware.com>, Carrboro, NC.
>
>
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