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Ramping into a group in POPS

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I think this is prolly an easy answer and I know I should know this. I have a pop net and I have to points enter a group based on the age, and once they are in that group a pop force takes over. but as of now they kinda pop as soon as that force takes over. is there a way to ramp into that group rather than it being an on or off so there is a smooth transaction into the pop force. Thanks for your suggestions in advance!! 

 

Rob

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Try using a fit() function to remap the age, then scale the force itself by that. Should be possible in the VEXPression section of your POP Force. 

You don't even need to put the particles in a group (unless you want to). 

float newage = fit(@age, 1.5, 3, 0,10);
force *= newage;
 

This will ramp the force from 0 - 10 as the particle goes from age 1.5 - 3. Before that, the force is 0.

Same can be done with "amp" in the noise section.

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