function [edges,bc2s,endcell,endbc] = drawLineOnSurface( nodes, tricellvc, startcell, ...
                                          startbc, heading, distance )
% [edges,bc2s,endcell,endbc] = drawLineOnSurface( nodes, edges, startcell,
%                                   startbc, heading, distance )
% Given a surface defined by a mesh of triangles (nodes,edges
end
