You can see from the picture that it was taken in-game (got the HUD displayed), however as both kinds of particles were quite small and the systems quite simple there was very little overlap to speak of, so I never noticed issues with the alpha and ZBuffer. To be honest, that doesn't surprise me enormously as these two points seem to be a recurrent problem with this engine... I also haven't got around to trying anything more complex with this yet, alas. And yes, that was my method. As to whether I am having these issues, I'd have to check with systems that are actually going to sit on top of each other visually. I'll get back to you on that.

You're going to have to forgive me for simply taking you for your word about the problems displayed in your pictures: I don't know where the emission points are supposed to be, I'm not sure what's supposed to be on top of what (but it certainly looks pretty confused) and the only edges I am seeing offhand are for the ice shards, which I assume are supposed to have straight edges? And where the particles appear to be intersecting the ground. I've no problem taking your word for it if you say it's got messed up though..

In any case, I hope you won't mind if I insist on experimenting further. I was left in no doubt that many very bright people here considered the driving goal of Item Interchange to be impossible, but I still put together a system that worked, and VASE was constructed with an array of "unknown blah-blah-blah"s. If I accepted what other people told me I couldn't do, I would have done neither of these things.

Vac

Here is a better http://img413.imageshack.us/i/ob3a.jpg/ I completely disabled all particle movement -> Every one of the particles emitting not on top of the shard pile is an incorrect emission point -> and the Z Buffer error is hard to catch a pic of as it blinks on and off very annoying causing the particles to be visable through other geometry.