an improved illumination model for shaded display
Toaccuratelyrenderatwo-dimensionalimageofathree-dimensionalscene,globalilluminationinformationthataffectstheintensityofeachpixeloftheimagemustbeknownatthetimetheintensityiscalculated.Inasimplifiedform,thisinformationisstoredinatreeof"rays&quo
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