hi calvin, make sure that thats the correct number for the field, uif you have more in the scene it changes the number, should have said that in my previous post as the example there is only the vol axis field there.

YOu alsn eed to set tup the particles lifespan to be Per particle. Its not the fields force wither its the particles

Full script without being lazy

if(particleShape1.inputForce[0]>0)
{
particleShape1.lifespanPP = 0;
}