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What algorithms/techniques are used in the rendering of this photo?


We use monte-carlo ray tracing. Each point on the camera's view traces out a ray that hits the scene and samples color for that part of the camera. For more naturally lit scenes, we allow the ray to bounce around in the scene, picking up and blending colors for each bounce to display at the pixel location the camera originally shot the ray from (you can see a little of the red wall blending into neighboring white walls from this effect).