I use raycastFirst but it does not return me normal which I write in houdini. It might calculate it himself. but I have no idea hot to get vertex or chunk on the model which I hited
Also, please note, that you will not get the triangle info that you hit with raycast, e.g. vertex positions. You would have to study Bullet sources to find out how to get that data, if needed.
oh yep I think I should