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Gouraud shading
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== Linear vs. hyperbolic interpolation == Gouraud's original paper described linear color interpolation.<ref name="thesis"/> In 1992, Blinn published an efficient algorithm for hyperbolic interpolation<ref>{{cite journal |last1=Blinn |first1=James F. |title=Hyperbolic Interpolation |journal=IEEE Computer Graphics and Applications |date=July 1992 |volume=12 |issue=4 |page=89-94 |doi=10.1109/MCG.1992.10028 |s2cid=207973430 |url=https://resolver.caltech.edu/CaltechAUTHORS:20191107-073429669 |ref=blinn}}</ref> that is used in [[Graphics processing unit|GPUs]] as a perspective correct alternative to linear interpolation. Both the linear and hyperbolic variants of interpolation of colors from vertices to pixels are commonly called "Gouraud shading".
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