I’m trying to emit particles with random age limits, and to have their sizes be modulated by their age %. I built the tree you can see below. The problem is, if both the “Get Point ID” (which allows each particle to have a different age limit) and “Modulate Value by Age Percentage” nodes are plugged in, all my particles become points with 0 size and stop rendering. If I unplug one of the two nodes, the particles render fine (but I don’t get the effect I want). Anybody knows what I’m doing wrong?

	Attachment

Ok sorry I should have RTFM more thoroughly, the Modulate Value by Age has to be plugged both in the Size port of the Emit node, and into a Set Particle Size node which is plugged in the ICETree node.

Thanks anyway

Hi,
If you want to modulate the size value over the lifetime of the particle, then it needs to be evaluated every frame as the age increases. Plug the ‘Modulate Value...’ into a ‘set particle size’ node and then into an execute port.

Hey there I started with your tree layout and worked this out, and as you can see by the
little render region this seems to work, is this what you were hoping for?

The main difference is I have the modulate age plugged into the set particle size and then into the IceTree node.

	Attachment

Oh Snap,
you beat me to it well done

Yeah, thanks for the help, though!