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Animate number of particles through GUI

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Hi there - I have a program which creates particles and has them floating on screen. What I would like to do is update the number of created particles through a slider in the GUI. I've tried a few things but I can't get it to work, I got it to work once but a new particle system was created every frame so not too useful..

If you have any ideas or places I could look it would be greatly appreciated!

Thanks


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