How to make a particle system activate

[graykin]

Yeah, you would probably want to call a SetEntityPlayerInteractCallback function.

PreloadParticleSystem simply loads a particle system into your memory, making the spawning of a particular particle system somewhat quicker, but it won't actually SPAWN a PS.

You would want to use the CreateParticleSystemAtEntity function--place a Script Area in the location you want the particle system to spawn, and then set the CreateParticleSystemAtEntity to make your one-shot particle system to spawn at that area.