Gaussian Kernel error (Interpolating 3D point data to Volume)


I made this geomodel that visualizes the UCS data by points.

And I want to add the volume that visulizes the expected UCS data which interpolated by IDW method.

I used PointVolumeInterpolator filter, but only VoronoiKernel worked.
I want to use GaussianKernel but except the Voronoi, every kernel’s result data was all 0.
Even though the original UCS data range is 15~150(MPa).

Could you please help me to solve this problem?