| particles | Input particle buffer, containing the desired particle state. | 
| size | The number of elements in the particles array that is written to the Particle System. | 
| offset | The offset into the destination particle list, to assign these particles. | 
Sets the particles of this Particle System.
Setting the lifetime of a particle to a negative value will result in that particle being removed from the Particle System. See Also: GetParticles.