Lordshiva1948 That example uses particles, i'm looking to avoid using that Thanks for taking the time to help out though.
@Hasuak Thanks, it's bit more clear (not that there was anything wrong with Brashmonkey's explanation). Haven't had a chance to try that but will give it a go and see how i get on.
Looking through some of the tutorials, i have found one thats helped.
I've managed to create rain with this tutorial (thanks Bl4ckSh33p) even though it's for snow, I've tweaked it for rain.
I've provided a capx of what i've done, is this OK to replace particles in terms of improving perfomance and memory usage?