I've been reading a bit about Image Based Reflections as seen in the Epic Samaritan Demo. There's a bit of information on how they work over on this UDN page.. http://udn.epicgames.com/Three/ImageBasedReflections.html
I was wondering if anyone has attempted supporting this type of reflection in their own engine or had any links they could point me to to learn more about how this is achieved. Since it seems to be a just quad reflector you could probably check intersection inside a pixel shader to determine texture coordinates for the quad. I'm wondering how this might be accelerated to robustly support multiple quads in a scene and limit the intersection checks.
Thanks in advance!