% HCROSS
%
% Function to form cross product between two points, or lines,
% in homogeneous coodinates.  The result is normalised to lie
% in the z = 1 plane.
% 
% Usage: c = hcross(a,b)
%

%  Peter Kovesi  April 2000
%  Department of Computer Science
%  The University of Western Australia

function c = hcross(a,b)
c = cross(a,b);
c = c/c(3);