Ascending Effects

Hi everyone,

It has been some time since I haven’t used FWsim so I have a question regarding the “ascending effect” !

I usually add some sparks especially for willow shells but I’ve noticed than whether I entre 0,1sec or 14sec duration for the combustion of sparks, they always last the same amount of time which is too fast and not realistic… Same thing for the stars trails… Am I doing something wrong or is there a bug somewhere ?

(Sorry for the inaccurate technical words used, I don’t know them since I use the software in french…)

Thank you for your help !