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Digital Foundry reveals the secrets of ray tracing in classic Doom

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The original Doom got a mod that added ray tracing to the game, which made it look pretty impressive, and Digital Foundry has prepared a technical analysis that reveals the secrets of this amazing development.

A ray tracing mod for Doom was announced by Sultim_t on April 1st, and many thought it was a joke, but it turned out to be true. But how could ray tracing be implemented into a 1993 game?

Alex Battaglia explains in the video the graphical features of id Software’s shooter and the fact that it had no lighting system or reflective surfaces.

Therefore, the modder had to work with a lot of imagination, replacing various objects so that they can respond to ray tracing, and introducing new light sources (in particular, a torch) to be used where there are none.

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