If you are asking for aximmetry project auto triggering this topic can help you

https://my.aximmetry.com/post/410-set-default-value-for-pin-collector-pin

Sorry i wasnt too clear about my isssue, the scene is built in ue4.

Its a niagara system, which is a one shot. in the editor it plays on a key press.

When playing in ue4, it only fires on key press

In aximmetry its bound to a trigger but plays as soon as the level is loaded.

I have tried flip flops - and the system doesn't activate at all in aximmetry

I have tried switching on integers (in UE4) - this crashes aximmetry

I have also tried branches/bools - this crashes aximmetry too.

Any idea's on stopping it from auto firing like it does in ue4 editor would be appreciated :D 

Hi,

You probably connected something to Event BeginPlay what should have been to Event Tick in your blueprint.

Could you help us dealing with the crashes you mentioned?
Exactly what did you connect to what in these cases?
Also dump files could be helpful for us.
Thank you!

I wired it up wrong, binding the trigger moved the event forward rather than the custom event - my mistake :D