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  2. Ray tracing (graphics) - Wikipedia

    en.wikipedia.org/wiki/Ray_tracing_(graphics)

    [6] [7] Using a computer for ray tracing to generate shaded pictures was first accomplished by Arthur Appel in 1968. [ 8 ] Appel used ray tracing for primary visibility (determining the closest surface to the camera at each image point) by tracing a ray through each point to be shaded into the scene to identify the visible surface.