Insects run down rock wall


i’m trying to get a large group of insects to run down a rock wall.

at the moment i’m using speed by surface, it’s not working too well. how do i get them to run in a chosen direction and stay adhered to the wall at the same time?



so i figured this out… i used a Lock/Bond. with Restrict to Surface turned on and Zero force.

now i’m trying to orient the particles correctly. i wonder if anyone here knows how to orient particles to a surface?