id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
25	Add IO derivatives of the play, simulate, and animate actions	Thomas DuBuisson		"I propose we generalize the animate, simulate, and play actions by providing variants allowing IO actions for world stepping and rendering.
  
  The reasoning here is:
  1) World-stepping should be permitted to be IO because there might be
  outside influences on the world state (ex: a networked game).
  2) Rendering the world should be permitted to be IO because there
  might be outside information needed (texture loading, map tile retrieving, etc).

This would be particularly useful for work like gloss-osm, that allows immediate rendering by presenting missing tiles with a default until the download is complete.
"	enhancement	closed	normal	1.7.0	Unknown	1.5.0	fixed