Calculate area of a traingle

Assign region values to smesh[].Region variable

Create an angular mesh

Create Multigrid based on spatial mesh level

Create a squarte mesh for given spatial mesh level

find the minimum from the vector d with the size n.

This function describes phase function or scattering kernel and is set to be Henyey-Greenstein phase function

find two linearly intepolated angles "b" and weights "b2" for the angle "theta_m"

calculate the distance between two points

Set Mus in nodes

Set Mus in nodes

convert triangular mesh to a square mesh

compute sweep ordering

This function provides angular weights and coordinates on 2D unit circular phase space.