Loading large .vtp files

[ming-origen]

Hi, I have a .vtp file with ~6 million grids, and it's causing quite some issues when rendering with vtk.js.
It straight up freezes and later crashes Firefox, while on Chrome nothing is visible.
I have followed the example here for loading the .vtp file:
https://kitware.github.io/vtk-js/examples/GeometryViewer.html
and have verified with Paraview that the .vtp file is indeed valid.

So my question is: does vtk.js have known performance issues with large grids?
If so, what's a reasonable number of grids that can be handled?

[jourdain]

You are probably reaching the limit of what your browser allow you to allocate as a single typed array. It might be interesting to see if WebAssembly do better for your use case since the C++ code of VTK has many optimization that don't necessary exist in JS.

[ming-origen]

Thanks for the reply. I am not very familiar with VTK, so could you shed some light on which parts can be optimized in this case?
Do you suggest that I use WebAssembly for the entire VTK codebase? Or are you referring to specific parts?

I am asking as I have noticed that you already have Paraview Glance as a Javascript+WebAssembly tool.
I have tried it on my .vtk file and it stops and says "File load failure". So I'm wondering if that's already porting Paraview completely using WebAssembly?

BTW, is there a way to get more details about "File load failure" from Paraview Glance? Maybe that'll help better identify the problem.

[jourdain]

ParaView Glance use vtk.js along with itk.js. The webassembly part of PVG come from itk.js with the reader sections for the medical image format (dicom, ...).

The part that I'm talking about was to use VTK/C++ as a WebAssembly component to do the read/process/render by creating some code similar to what was done here in those examples.

I'm not saying it will load your big data in your browser, but it could be interesting to see if it does.

Also, based on what you are saying we might run into browser limitation. It might be possible to improve vtk.js but I'm not sure how much room we have in that regard.

[ming-origen]

Thanks! I'll start with those examples, and see where I can go from there.

[jourdain]

If this is still an issue, please re-open.