Synthetic dataset of multistatic far-/near-field scattering matrices for
penetrable scatterers in 3D free space, generated with the jaxhps HPS+BIE
forward solver (examples/scattering_dataset_3d.py).
Each sample is a sum of n in {1,2,3} smooth radial bumps
b(x) = sum_k A_k (1 - (|x - c_k|/R_k)^2)^4 for |x - c_k| < R_k,
with squared refractive index n(x)^2 = 1 - b(x). The scattered field solves
Lap u^s +… See the full description on the dataset page:
https://huggingface.co/datasets/jma02/helmholtz-scattering-3d-pilot.
