Typically, there are no polys to hit on the “inside” of a mesh. You might try a specially crafted mesh that has polys inside it, and see if that works.
You might also try tracing twice, once from start to end, and once from end to start.
Typically, there are no polys to hit on the “inside” of a mesh. You might try a specially crafted mesh that has polys inside it, and see if that works.
You might also try tracing twice, once from start to end, and once from end to start.