Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fully Threaded Transport Engine: New Method for Multi-Scale Radiative
  Transfer   A new, very fast method for 3D radiative transfer on fully threaded grids
with arbitrarily high angular resolution is presented. The method uses
completely cell-based discretization, and is ideally suited for problems with
diffuse background radiation, often encountered in cosmological and star
formation models. We find that for accurate statistical study of intergalactic
Ly-alpha absorption lines one needs of order of few hundred angular
discretization elements even for models without radiative feedback from star
forming galaxies.

9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat