Hello,

I have an issue with the Time Inc parameter of the Particle Sop.
I want to emit a static bank of particles over a grid on frame 1, so i have put this expression in the field: if($FF==1,4000,0), but when i connect anything with an animated parameter in the Force input, my expression seems to be bypassed and the Time Inc seems to go back to it's default value (1/$FPS) which result in a standard emission of particles all over the grid.

Is there anything i'm doing wrong with this?

Thanks.

the method is :
in POP network and in “Birth” tab, write the $F == 1 in “Impulse Activation”. this expression means that particles only generate in Frame 1 . Also set the
“constant Activation” to 0 . you can also set the number of your particle in
“Impulse Birth rate” .
You need also set some velocity at “Attribute” tab .

Check the attached file , I did a simple example for you .

Hope it help you