[Mirra] fading trails

[enrike]

> nice, now i at least know where to look! i feel it's pretty deep for me 
> to dig in but i'll give it a go. seems more doable than writing a new 
> trail function anyway; copying the same instance of an object over and 
> over while blending it more and more really makes my cpu melt.. ;)

yes i can smell the smoke coming from your CPU from here... Thats quite 
a crazy way to do it. Mirra (or Python) is not very efficient for this 
kind of tasks. Having few objects in the render loop takes a loot of 
CPU. I have plans to check if it worth porting some parts of mirra to C, 
I dont know so much C so any help is welcome... I guess there are other 
methods before that, like Pyrex and stuff like this.

let me know if you get anywhere, we could add your code to mirra if you 
get it working in a nice way.

enrike