Make particles inherit the emitter's movement velocity (Unity's "Inherit Velocity"). 'initial' adds the emitter velocity to the particle velocity once at spawn; 'current' displaces particles by the current emitter velocity every frame.
Optional
Learned in initialize, so undefined until this behavior sees a particle.
Static
Make particles inherit the emitter's movement velocity (Unity's "Inherit Velocity"). 'initial' adds the emitter velocity to the particle velocity once at spawn; 'current' displaces particles by the current emitter velocity every frame.