Hi all,

I've been trying to port our application to MITK 2021.02. I usually look at
mitk-diffusion because we both work with the FiberBundle class and this
helps me a lot! (Thank you Peter). However, I have a problem that I'm
unable to solve. The 2D FiberBundle doesn't seem to work with vtk9. See
https://i.imgur.com/d8I2PtP.png

   - The crosshair is in the middle of a set of streamlines but we only see
   them in the sagittal view. If I want to see them in the other views, I need
   to place the crosshair at a "random" location. To see them in all views, I
   need to be at a weird location that is not the center of the image.
   - The streamlines are visible only in 3 slices. If I go further than
   that, they simply disappear.
   - But they are completely visible like in the 3D view. I tried changing
   the Fiber2DSliceThickness property. To have an "acceptable" result, I need
   to use a really small number like 0.01. The screenshot above is using 0.1.
   At 0.5, I can see the whole streamlines.
   - It's as if the streamlines are not where we see them. As if they were
   really tiny.
   - Or the shaders are simply broken on vtk9.

I can clearly see that the mapper in mitk-diffusion (latest release using
VTK 8.1.0) works, so I tried removing our modifications as much as possible
to be as identical to mitk-diffusion as possible. I'm using the same
TrackVis loader, FiberBundle, mapper 2D 3D, etc. It didn't change anything.

At that point, I'm already at several days of debugging, I don't know what
to try and I would gladly accept any help!

Nil

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