How to find out which edge has been intersected by the ray during the
ray-triangle intersection procedure if the ray hits an edge. I think
one cand etermine if the ray has hit an edge based on the barycentric
coordinates -
http://upload.wikimedia.org/wikipedia/commons/f/fa/Barycentric_coordinates_1.png
if any of the 3 barycentric coordinates is 0, then the ray has hit an
edge.
The question is which edge ?
If can make the ray intersect independently against every edge and
find the closest intersection but that seems lengthy. Is there a fast
check ?
