Improved near optimal angular quadratures for polarised radiative transfer in 3D MHD models

Accurate angular quadratures are crucial for the numerical solution of three-dimensional (3D) radiative transfer problems, especially when spectral line polarisation produced by scattering anisotropic radiation is included. There two requirements obtaining an optimal quadrature and they difficult to satisfy simultaneously: high accuracy short computing time. By imposing certain symmetries, we were recently able derive a set near quadratures. Here, extend our previous investigation considering other symmetries. Moreover, test performance new numerically solving problem resonance in 3D model solar atmosphere resulting from magneto-hydrodynamical simulation. The derived here outperform ones terms number rays needed achieve any given accuracy.