I really need to know how to do this, because my deadline is approacing, as always :S.
I've made a light streak/light spline with particular, that follows/ emits from a light source.
I have animated it so that it enters the picture fast (by keyframing the spline path in that way), and then I've used "Physics Time Factor" to make it like slow motion...
The problem is, that i want it to exit the picture/viewer in the same manner. Going from something that look like ultra-slow, to then speed up and rapidly leave the picture/viewer - BUT:
How can i control the end of the spline properly. The particle life-span isn't that great, cause when it's animated in this way, it gets very uncontrollable. Here the time factor also messes a bit with the whole timing, cause it's also slowing the time-span of the particles, so it's very unpredictable.
Is there a way to control, when the end of the spline shows instead of particle life span?