Ray-marches the depth buffer to find reflected surfaces. Convincing while the reflected geometry is on screen, and falls back to an environment map the moment it is not.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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approximatesis a cheaper stand-in for Specular Reflectionreuses the frame buffer instead of tracing the scene