An ExpireModifier that holds other BaseSingleValueSpanModifiers, overriding their toTimes to match the lifeTime of the particle based on the value from the ExpireModifier.
ExpireModifier
BaseSingleValueSpanModifier
toTime
lifeTime
Causes the particle to expire after it has entered and left the view of the camera.
(c) 2010 Nicolas Gramlich (c) 2011 Zynga Inc.