engine/plugins/actor_effects/reveal-children-progress.luz.rb
class ActorEffectRevealChildrenProgress < ActorEffect
virtual # deprecated
title "Reveal Children Progress"
description ""
setting 'progress', :float, :range => 0.0..1.0, :default => 0.0..1.0
def render
return if progress == 0.0
yield if (child_index.to_f / total_children) <= progress
end
end