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Sci. Comput."],"published-print":{"date-parts":[[2020,1]]},"abstract":"<jats:p>In this work we present an algorithm to construct an infinitely differentiable smooth surface from an input consisting of a (rectilinear) triangulation of a surface of arbitrary shape. The original surface can have nontrivial genus and multiscale features, and our algorithm has computational complexity which is linear in the number of input triangles. We use a smoothing kernel to define a function $\\Phi$ whose level set defines the surface of interest. Charts are subsequently generated as maps from the original user-specified triangles to $\\mathbb R^3$. The degree of smoothness is controlled locally by the kernel to be commensurate with the fineness of the input triangulation. The expression for $\\Phi$ can be transformed into a boundary integral, whose evaluation can be accelerated using a fast multipole method. 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