particles to emit form one face only

in the attached i made a partilces system and with vertex groups i selected a face to make emmission form it only, but its emitting from nearby faces as well. what am i doing wrong?

thanks in advancePARTICLES EXPERIMENT.blend (475 KB)

A vertex group contains vertices, not faces. It will emit from faces connected to those vertices. You might want to inset a face inside the face you want to emit from, and make the vertex group contain only those new inner vertices.

thanks for the explanation. makes sense. so is there face group? :slight_smile:

No just vertex groups.

you could duplicate the face and use that as your emmiter instead