SPHVolumeInterpolator with cutoff array

ParaView Support
1

Hi,

I’m trying to use the SPHVolumeInterpolator to create a volume rendering image from a SPH particle
distribution. I get nice results with a fixed smoothing length (= fixed spatial step).
However, my simulation uses variable smoothing lengths and I tried to use the smoothing lengths from the simulation as the cutoff array, but all nodes/interpolated values are zero then.
I’ve found the following information from two years ago and was wondering, if the cutoff array now works:
https://public.kitware.com/pipermail/paraview/2017-March/039713.html

So, just to get it right: for a standard SPH kernel sum: rho_i = \sum_j m_j W_ij(h_i,h_j) how do I specify the smoothing lengths in the array selection for density, mass and cutoff array and which spatial step do I have to insert then?

Thanks

Christoph

2

The following commit https://gitlab.kitware.com/vtk/vtk/-/commit/cabbdb3ab1f816bd1b2595c21d88de80b26b5895 corrected previous mis-understandings about the cutoff distance. It supports the fact that the cutoff array should be defined in the input point data, not in the source point data.
The problem remains with the ParaView GUI (v5.10-RC1 tested). The Array Selections lets you choose all arrays (Density, Mass and Cutoff) from the source point data, and it fails silently if you provide your own smoothing length array’s name, since that array is not attached to the probing object (Line, Plane or Volume).