Vtk-js: VTK Mesh (unstructured grid) reader

[aylward]

Thoughts on possible next steps:

• [x] 1. itk.js Mesh to vtk.js vtkPolyData in WebAssembly. This will allow use to use .vtk and other ITK-supported mesh file formats.
• [ ] 2. A vtk.js helper class similar to ITKImageReader for PolyData
• [ ] 3. PVG adds support for this class
• [ ] 4. We start building some VTK PolyData IO classes to WebAssembly modules
• [ ] 4.b. ITK SpatialObject to VTK PolyData classes to WebAssembly module(s)
• [ ] 5. We start building some VTK Unstructured Grid IO classes to WebAssembly modules but include a filter to output PolyData

• [ ] 6 (?). Independent Unstructured Grid to PolyData WebAssembly support, vtk.js Unstructured Grid support, Unstructured Grid IO WebAssembly

  I think it might be a good test for vtk-emscripten - IO and conversion class.

[thewtex]

Yes! :space_invader: :sparkler: :sparkling_heart:

Starting on this.

Inserted 4.b) - ITK SpatialObject to VTK PolyData :-D

[wschroed]

It might be better if spatial objects are "mapped" to VTK implicit
functions, they are nearly the same thing. Then in VTK, there are tools for
generating surfaces (ie polydata), selecting and extracting data etc with
implicit functions. But depending on workflow there are probably a couple
of different paths to take....

On Thu, Feb 7, 2019 at 2:13 PM Matt McCormick [e-mail]
wrote:

Yes! 👾 🎇 💖

Starting on this.

Inserted 4.b) - ITK SpatialObject to VTK PolyData :-D

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[thewtex]

@wschroed good point. We can take an incremental approach. First to PolyData so we can just visualize them. Then to VTK Implicit Functions. We likely find that we want / need the implicit functions for cropping, cutting, etc., but individual conversions will take more time. And, vtk.js Implicit Functions support can also mature in the process.

[thewtex]

1 addressed here: https://github.com/InsightSoftwareConsortium/itk-js/pull/190