Historically, though, computer hardware hasn’t been fast enough to use these techniques in real time, such as in video games. Now turn that around and follow the path of those beams backwards from your eye to the objects that light interacts with.
The objects you’re seeing are illuminated by beams of light. The easiest way to think of ray tracing is to look around you, right now.
Live-action movies blend computer-generated effects and images captured in the real world seamlessly, while animated feature films cloak digitally generated scenes in light and shadow as expressive as anything shot by a cameraman. Ray tracing produces images that can be indistinguishable from those captured by a camera. It makes the fire, smoke and explosions of war films look real. Getting these right makes starfighters in sci-fi epics scream. Think realistic reflections, refractions and shadows. Ray tracing is the technique modern movies rely on to generate or enhance special effects. There may not be many people outside of computer graphics who know what ray tracing is, but there are very few people on the planet who haven’t seen it. What is ray tracing? Just go to your nearest multiplex, plunk down a twenty and pick up some popcorn.
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