[vtk-developers] vtk-glTF

Fri Nov 30 13:20:53 EST 2018

I also integrated Assimp with a fork of VTK before as well, but it was for something very specific because we needed bone weights/indices. However, from what I understand, Assimp seems to internally process the mesh data, so you may get slightly different results than the vtkOBJReader (for instance) because of vertex reordering.

________________________________
From: Alexis Girault [alexis.girault at kitware.com]
Sent: Friday, November 30, 2018 12:37 PM
To: Milef, Nicholas Boris; Aashish Chaudhary; Mathieu Westphal
Cc: Ken Martin; Steve Pieper; vtk-developers at public.kitware.com
Subject: Re: [vtk-developers] vtk-glTF

Nicholas Milef from RPI was the one who inquired about ASSIMP in VTK: http://vtk.1045678.n5.nabble.com/Assimp-integration-td5741474.html
CCing in case he wants to follow up on it

Nick also integrated ASSIMP in iMSTK. To answer your question Aashish:
- iMSTK has its own data structure for geometries that uses Eigen: https://gitlab.kitware.com/iMSTK/iMSTK/tree/master/Source/Geometry/Mesh
- The ASSIMP importer converts (copies) the data from ASSIMP to those internal Eigen structures: https://gitlab.kitware.com/iMSTK/iMSTK/blob/master/Source/Geometry/Reader/imstkAssimpMeshIO.cpp
- The geometry vertices are mapped to a VTK data array with no copy: https://gitlab.kitware.com/iMSTK/iMSTK/blob/85c154f1/Source/Rendering/VTKRenderer/RenderDelegate/imstkVTKSurfaceMeshRenderDelegate.cpp#L48-52

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

http://www.kitware.com<http://www.kitware.com/>
(919) 969-6990 x325<tel:(919)+969-6990+x325>

On Fri, Nov 30, 2018 at 10:50 AM Sebastien Jourdain <sebastien.jourdain at kitware.com<mailto:sebastien.jourdain at kitware.com>> wrote:
I would love that, but I'm not aware of any.

On Fri, Nov 30, 2018 at 8:46 AM Matt McCormick <matt.mccormick at kitware.com<mailto:matt.mccormick at kitware.com>> wrote:
Are there any plans for a glTF reader in vtk.js? With a writer in VTK, this may be an efficient path for VTK/ITK output in WebAssembly rendered in vtk.js.

- Matt

On Fri, Nov 30, 2018 at 10:23 AM Ken Martin via vtk-developers <vtk-developers at public.kitware.com<mailto:vtk-developers at public.kitware.com>> wrote:
Has anyone looked into putting assimp into VTK?

On Fri, Nov 30, 2018 at 10:09 AM Alexis Girault via vtk-developers <vtk-developers at public.kitware.com<mailto:vtk-developers at public.kitware.com>> wrote:
For a list of existing IO toolkits, see "Converters, Importers, and Exporters"  on Khronos page for gltf here: https://www.khronos.org/gltf/

In iMSTK, we have been using ASSIMP<http://www.assimp.org/> (mentioned in the list above) for some other formats. I believe people inquired about integrating ASSIMP in VTK in the past.

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

http://www.kitware.com<http://www.kitware.com/>
(919) 969-6990 x325<tel:(919)+969-6990+x325>

On Fri, Nov 30, 2018 at 10:04 AM Aashish Chaudhary via vtk-developers <vtk-developers at public.kitware.com<mailto:vtk-developers at public.kitware.com>> wrote:
Yes please do. You could post the updates on the mailing list (dev).

Thanks

On Fri, Nov 30, 2018 at 10:01 AM Mathieu Westphal <mathieu.westphal at kitware.com<mailto:mathieu.westphal at kitware.com>> wrote:
HI Aashish, list,

We are currently working on a gltf reader ! But only for next year.
Let us know if you want to be kept in the loop.

Best,

Mathieu Westphal

On Fri, Nov 30, 2018 at 3:58 PM Aashish Chaudhary via vtk-developers <vtk-developers at public.kitware.com<mailto:vtk-developers at public.kitware.com>> wrote:
Having a glTF reader/writer would be great to have in VTK specifically for us as geospatial community is producing more data in this format.

- Aashish

On Fri, Nov 30, 2018 at 7:57 AM Steve Pieper <pieper at isomics.com<mailto:pieper at isomics.com>> wrote:
Hi -

I'd love to see a glTF 2.0 exporter native in VTK.  I wrote a glTF 1.0 version in python a while back if you want to look at that for reference [1].

On request: please include a WriteToMemory option like in the vtkImageWriter classes so it can be used easily without the file system (e.g. like in the web server mode I was doing).

Good luck,
Steve

[1] https://github.com/pieper/SlicerWeb/blob/master/WebServer/WebServer.py#L37-L457

On Thu, Nov 29, 2018 at 10:32 PM Ken Martin via vtk-developers <vtk-developers at public.kitware.com<mailto:vtk-developers at public.kitware.com>> wrote:
FWIW I'm working on a simple very basic starting point for gltf ala

https://gitlab.kitware.com/ken-martin/vtk/commit/656f7e231e9434431e234f701c7101006e2be40a

if you want to work off that. I'll probably try merging it soon .

- Ken

On Thu, Nov 29, 2018 at 9:11 PM Sal Choueib <sal.choueib at queensu.ca<mailto:sal.choueib at queensu.ca>> wrote:

Hello All,

   We are currently in the process of developing an exporter to glTF 2.0. Does anyone have experience working with gltf? Or perhaps knows of any resources that might be useful?

   Furthermore, we are utilizing tiny-gltf, a header only glTF library, to serialize data and write the gltf file (https://github.com/syoyo/tinygltf<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fsyoyo%2Ftinygltf&data=02%7C01%7C%7Cb483f966d3e64e639c5f08d653be573f%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636788474294213389&sdata=W7iwlPE31LC0XVeJoEos9iVdcZCWmR%2BCwZe%2Bp%2FIP4EE%3D&reserved=0>). We are hoping someone could comment on our choice of library. Is this library good? Any potential risks or cons to using this library? Does anyone have suggestions for a better library to use?

  Thank you for your help,

Sal

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