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+// This file is part of libigl, a simple c++ geometry processing library.
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+//
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+// Copyright (C) 2017 Zhongshi Jiang <jiangzs@nyu.edu>
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+//
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+// This Source Code Form is subject to the terms of the Mozilla Public License
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+// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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+// obtain one at http://mozilla.org/MPL/2.0/.
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+
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+#ifndef IGL_EXACT_GEODESIC_H
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+#define IGL_EXACT_GEODESIC_H
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+
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+#include "igl_inline.h"
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+#include <Eigen/Core>
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+
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+namespace igl
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+{
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+ // Exact geodesic algorithm for triangular mesh with the implementation from https://code.google.com/archive/p/geodesic/,
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+ // and the algorithm first described by Mitchell, Mount and Papadimitriou in 1987
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+ //
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+ // Inputs:
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+ // V #V by 3 list of 3D vertex positions
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+ // F #F by 3 list of mesh faces
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+ // VS #VS by 1 vector specifying indices of source vertices
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+ // FS #FS by 1 vector specifying indices of source faces
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+ // VT #VT by 1 vector specifying indices of target vertices
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+ // FT #FT by 1 vector specifying indices of target faces
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+ // Output:
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+ // D #VT+#FT by 1 vector of geodesic distances of each target w.r.t. the nearest one in the source set
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+ //
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+ // Note:
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+ // Specifying a face as target/source means its center.
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+ //
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+ template <
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+ typename DerivedV,
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+ typename DerivedF,
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+ typename DerivedVS,
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+ typename DerivedFS,
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+ typename DerivedVT,
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+ typename DerivedFT,
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+ typename DerivedD>
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+ IGL_INLINE void exact_geodesic(
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+ const Eigen::MatrixBase<DerivedV> &V,
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+ const Eigen::MatrixBase<DerivedF> &F,
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+ const Eigen::MatrixBase<DerivedVS> &VS,
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+ const Eigen::MatrixBase<DerivedFS> &FS,
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+ const Eigen::MatrixBase<DerivedVT> &VT,
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+ const Eigen::MatrixBase<DerivedFT> &FT,
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+ Eigen::PlainObjectBase<DerivedD> &D);
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+}
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+
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+#ifndef IGL_STATIC_LIBRARY
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+# include "exact_geodesic.cpp"
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+#endif
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+
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+#endif
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Zhongshi Jiang