...

ghly 7 days, but we had been working on the tech for around 18 months. The prototype AMD graphics cards we were using at the time became unstable at high clock frequencies, so we unfortunately had to show it at only 640x480 or 800x600 resolution with no AA. The real-time participating media effect used on the entire scene (pay attention to the light rays poking in from the front garage doors as they are riddled with bullet holes) consumed around 40% of our entire GPU budget. This effect is 100% dynamically computed by ray marching through dynamic 16-bit spotlight shadow maps, and was a very advanced effect for 2004. This demo shows light prepass rendering, HDR rendering, omni light shadows via dual paraboloid shadow maps, spotlight shadow maps, and dynamic light scattering effects on the omni/spot lights. Much of this engine code wound up shipping in Age of Empires 3 and Halo Wars. The demo switches to an interactive camera mode at the end that lets you look around, but I couldn't find the funky and obscure Xbox 1 USB converter box+driver expected by the demo code. For more info: https://sites.google.com/site/richgel99/