Ok, I was told maybe that might interest people, so here it is.
This came from a test with particles. I tried to reproduce the look of a “chasseur” 's thruster (I love that name 8) ) in english it’s a err … i don’t know .
Well you know, airplanes like the Migs or F-14 etc…
You can find what I did there:
2 files named test-reacteur* (a jpg and an mpg to loop)