Editing Particle system (section)

=== Emission stage ===
An emitter implements a spawning rate (how many particles are generated per unit of time), the particles' initial velocity vector (the direction they are emitted upon creation). When using a mesh object as an emitter, the initial velocity vector is often set to be [[Surface normal|normal]] to the individual face(s) of the object, making the particles appear to "spray" directly from each face but this is optional.