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Particular - Stop birth but still scale

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Brad Hodgson
Particular - Stop birth but still scale
on Mar 16, 2011 at 6:09:26 pm

Hey guys.. posted this is Trapcode forum, but also thought I'd post here:


I'm sorry, I don't know how to word this best for the search... what I tried brought nothing relevant up..

I need to have a cloud of floating particles... that have a longer life but that don't have an active birth any longer... they also need to increase in size over their life.

This all works fine if birth rate stays a positive number... if I keyframe birth rate from say 5 to 0 to stop new particles from being born, I can no longer animate the size or size over life. Any insight into what I'm doing wrong?

Thanks!

Brad Hodgson

Brad Hodgson


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Walter Soyka
Re: Particular - Stop birth but still scale
on Mar 16, 2011 at 9:05:05 pm

[Brad Hodgson] "This all works fine if birth rate stays a positive number... if I keyframe birth rate from say 5 to 0 to stop new particles from being born, I can no longer animate the size or size over life. Any insight into what I'm doing wrong?"

Size is a property that is applied to a particle at its birth, so animating it only affects new particles born at or after the time the value changes. Existing particles will not be affected by animating the size property.

Size over Life can't be animated, but the curve that you draw there should affect all particles in the system, irrespective of the birth rate.

Can you post a couple screen shots or maybe a project file showing your problem?

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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