Thread

1. hackyhacky · 1790097256 · focus · HN ↗

   This is very interesting, but way above my pay grade. Can someone explain how the resulting image reflects light traveling backwards in time?

   1. addaon · 1790098335 · focus · HN ↗

      Can you clarify your question? Light does not travel in time -- that's sort of the main characteristic of things traveling at the speed of light.

      1. sebzim4500 · 1790100899 · focus · HN ↗

         It does if you are ray tracing. They are trying to find the source of a theoretical photon that hits the screen at the present time, the source will therefore have been in the past so they need to run time backwards as the photon moves away from the camera.

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