I’m working on (of couse) a space ship for a story I’m writing, and I’ve set it up so that the engine emits these blue halos. I want them to fill the area indicated in the image below, but I don’t want them to leave that area except in that small area at the rear (see pic):
when you constraint particles in a lattice, be sure to used a matrice with an higher resolution than needed, and that the emitter is entirely inside the lattice.