Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Algorithm for Pyramidal Clipping of Line Segments in E3   A new algorithm for clipping a line segment against a pyramid in E3 is
presented. This algorithm avoids computation of intersection points which are
not end-points of the output line segment. It also allows solving all cases
more effectively. The performance of this algorithm is shown to be consistently
better than existing algorithms, including the Cohen-Sutherland, Liang-Barsky
and Cyrus-Beck algorithms.

14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom