Pyvista issue with volume data representation

[xhluca]

See readme https://github.com/lizzjs/dash-vtk

@jourdain this seems out of my domain, do you think this is an easy fix or something that can be added to docs?

[jourdain]

I'm wondering if it is related to numpy array. I'm currently off but I would try to add a tolist() or something along that to work around the current issue on that line assuming the issue is related to that part.

[lizzjs]

I'm wondering if it is related to numpy array. I'm currently off but I would try to add a tolist() or something along that to work around the current issue on that line assuming the issue is related to that part.

I tried what you suggested and it still gives the same error.

[jourdain]

Maybe I should have asked what is the error?

[jourdain]

Sorry, I just looked at the data and your field is a vector (3 components). You will have to convert it to a scalar if you want to render it in volume rendering.

[jourdain]

But my guess is that you want geometry rendering with glyphing or something along those lines. But maybe I'm wrong and I have no idea on what you are trying to see.

[jourdain]

Maybe some stream tracer like with the bike demo?

[lizzjs]

I believe this is exactly what we want, although we would like to focus the streamlines on just the airflow (blue-ish part of the image). To achieve this you used geometry rendering?

[jourdain]

Yes, geometry rendering with some filtering to generate the stream lines. (sorry for the late reply, just got back from vacation)

[lizzjs]

I think I am a bit confused on how to render it using dash-vtk, are you using PyVista or VTK to load the data points? (Also, it's okay, thank you for your reply)

[jourdain]

To me VTK or PyVista is the same thing. That only affect the syntax but under the hood it is VTK.
From your grid you need to do a stream tracer or something similar (look at the motorcycle example) and then with dash-vtk you just need to use a geometry representation with a mesh.

HTH