To support parent, a somewhat technical writeup: http://blogs.valvesoftware.com/abrash/why-you-wont-see-hard-ar-anytime-soon/ http://blogs.valvesoftware.com/ab

To support parent, a somewhat technical writeup: http://blogs.valvesoftware.com/abrash/why-you-wont-see-hard-ar-anytime-soon/ http://blogs.valvesoftware.com/abrash/why-you-wont-see-hard-...