Periodic ghost cells usage with ParaView master (just after 5.13)

[CharlesGueunet]

Describe the bug

Calling the TTK Periodic Ghosts Generation on a distributed image data does not seems to produce the new "external ghost layer".

To Reproduce With a paraview master, connected to a pvserver with 4 ranks

The dataset: A Wavelet image data with unsymetric data, distributed as shown by the wireframe:

• Wavelet (Whole extent to 0-10 for each)
• Ghost Cells
• TTK Periodic Ghosts Generation => From here, both outline still have the same size
• TTK Discrete Gradient => The discrete gradient does not seems to be periodic, we can compare it with a discrete gradient called before the Periodic Ghosts Generation

Here is an extract ghost cells on the Periodic Ghost generation, only internal ghost cells are visible:

Expected behavior

• A new layer of ghost cells to be added after the TTK Periodic Ghosts Generations
• This layer to be visible with an extract ghost cells

System (please complete the following information):

• OS: Gentoo
• Compiler clang 18.1.8
• TTK Version: dev, which is incidentally a 1.3.0
• Paraview master

[CharlesGueunet]

@julien-tierny @eve-le-guillou FYI

[eve-le-guillou]

Hi Charles,

Thank you for pointing this out. I just tried on my machine and it works (in the sense that the ghost cells extraction shows additional ghost cells). I am on Ubuntu 20.04.6.

Which ParaView are you using? I am currently using 5.12.1.

[julien-tierny]

@eve-le-guillou thanks for your quick feedback! (as a side note, you may want to upgrade to ParaView 5.13, irrespective of this issue)

[CharlesGueunet]

I edited the description to add this information. It is ParaView commit ae0120bda1cafd9e01dd1cfe477b8958a168ce56 It is indeed after the 5.13