salvus.material.patches.approx_oracle_plugins

Create an approximate wavelength oracle for anisotropic acoustic materials.

This function wraps acoustic anisotropic materials to provide a faster but approximate wavelength oracle calculation. For non-acoustic or isotropic materials, it falls back to the original oracle computation. For any anisotropic acoustic material the approximation assumes elliptical hexagonal symmetry to reduce the computational cost of estimating wavelengths while maintaining reasonable accuracy for meshing purposes.