Triangulate a meshm data grid for ray tracing

I have the following code, which creates me a 3-d model of the Earth:

Earth = wgs84Ellipsoid;
% Create axes from mapping toolbox. Apply to geoid.
axesm('globe','Grid','on','Gcolor',[.7 .8 .9],'GlineStyle','-','Geoid',Earth)
axis off
view(3)

% Load topographic data
load topo
% Drape topographic data over the ellipsoid
hs = meshm(topo,topolegend,size(topo),topo);
demcmap(topo)

Now I want to use ray tracing to check for hidden surfaces. This package from File Exchange seems to be sufficient.

How can I triangulate my Earth model? It seems like there is no easy way to get from meshm to mesh?