Hi all,
I've been asked to make an effect like this...

I was wondering how to make this... i was suggested to make this effect via particles but the result wasn't satisfactory... itried also to make a soft transparent body following the object i need to create the trail from but even if the result isn't that bad i have to spend something like a several hours in rendering few frames.
i am looking through many forums and many people asks about realizing this effect but no answer is good
many suggest to use after effects but i think that it's possible to make it with maya...
I'm not really sure if this is a matter of dynamics or rendering....
thank you all in advance 