An alien astronomer is using a very inefficient method to observe the star systems they visit. Their spaceships are terribly advanced, but their optics are woefully behind: their best telescope only lets them see a single color.
But they persist. They survey the sky, one color at a time, moving the telescope just a little each time, and noting down the color they see. Slowly, painstakingly, an image emerges.
@musurca, yeah :) each frame I clear a random few pixels, then cast rays until the frame time runs out. If a ray hits an object, I cast more around that area for a while until the astronomer gets bored and looks somewhere else.
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