CREATEMEDIUM Creates a vmcmedium structure USAGE: vmcmedium = createMedium(vmcmesh); returns vmcmedium.refractive_index(:) = 1; vmcmedium.scattering_coefficient(:) = 0; vmcmedium.absorption_coefficient(:) = 0; vmcmedium.scattering_anisotropy(:) = 0; vmcmedium_out = createMedium(vmcmesh, vmcmedium); repeats the entries in vmcmedium so that the size of each array is equal to the number of elements in the mesh. DESCRIPTION: The purpose of this function is to create or resize the arrays in vmcmedium so that they match the number of elements in the mesh. INPUT: vmcmesh - mesh structure, contains the geometry of the system OPTIONAL INPUT: vmcmedium - medium structure, used to set optical coefficients OUTPUT: vmcmedium_out - formatted medium structure SEE ALSO: https://inverselight.github.io/ValoMC/structures.html This function is part of ValoMC toolbox