So I'm a huge fan of the ray sop, and use it all over the place, but in certain situations it does not seem as robust as I would like.

So using the “intersect farthest surface”..

One situation is when the ray is starting from inside the volume of a mesh. I often find myself in a situation where I would like to shoot a ray from the center of a mesh to the outside surface, this seems very hit and miss, not sure if it has to do with how confined the volume is around the point i'm doing the ray cast with, but I have found situations often where the ray will not project at all.

I have also found that if the far surface is at a glancing angle to the ray being projected it does not see/hit it.

I guess I'm asking if there are any trick/tips. So far I have not gotten around these issues with Ray tolerance, samples, jitter etc.

Here are two images, showing the issue. My solution has been to Resample a line so it is very dense with points to increase the odds of a hit. As you can see rays right next to a hit may miss and pass right through or call a difference surface the far surface. Or the ray has given up it would seem and stopped at surface that is the 2nd or 3rd farthest in its path. Another work around is I have rotated the line so it is hitting from the outside.

Any ideas? thanks for any guidance.