Project a ray for a single pixel into the 3D world, figure out what polygon that ray hits first, then color it appropriately.
Ray tracing involves tracing the path of a ray (a beam of light) within a 3D world. 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. RTX aka Ray tracing, is a rendering technique for generating an image by tracing the light path as pixels in an image plane, and simulating the effects with virtual objects.
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