Immediately moves all existing particles by the given offset. For example an offset of x=3,y=5,z=0 would move all particles to the right by 3 units and down 5 units. This does not affect the particle emitter but can be used in conjunction with Set3DParticlesPosition to move both the emitter and the particles that already exist.
Offset3DParticles( ID, x, y, z )