2ae2672ee9
Fixing dep build script on Windows and removing some warnings. Use bundled igl by default. Not building with the dependency scripts if not explicitly stated. This way, it will stay in Fix the libigl patch to include C source files in header only mode.
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2014 Alec Jacobson <alecjacobson@gmail.com>
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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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#ifndef IGL_COTMATRIX_H
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#define IGL_COTMATRIX_H
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#include "igl_inline.h"
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#include <Eigen/Dense>
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#include <Eigen/Sparse>
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// History:
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// Used const references rather than copying the entire mesh
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// Alec 9 October 2011
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// removed cotan (uniform weights) optional parameter it was building a buggy
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// half of the uniform laplacian, please see adjacency_matrix instead
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// Alec 9 October 2011
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namespace igl
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{
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// Constructs the cotangent stiffness matrix (discrete laplacian) for a given
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// mesh (V,F).
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//
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// Templates:
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// DerivedV derived type of eigen matrix for V (e.g. derived from
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// MatrixXd)
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// DerivedF derived type of eigen matrix for F (e.g. derived from
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// MatrixXi)
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// Scalar scalar type for eigen sparse matrix (e.g. double)
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// Inputs:
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// V #V by dim list of mesh vertex positions
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// F #F by simplex_size list of mesh faces (must be triangles)
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// Outputs:
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// L #V by #V cotangent matrix, each row i corresponding to V(i,:)
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//
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// See also: adjacency_matrix
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//
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// Note: This Laplacian uses the convention that diagonal entries are
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// **minus** the sum of off-diagonal entries. The diagonal entries are
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// therefore in general negative and the matrix is **negative** semi-definite
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// (immediately, -L is **positive** semi-definite)
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//
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template <typename DerivedV, typename DerivedF, typename Scalar>
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IGL_INLINE void cotmatrix(
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const Eigen::MatrixBase<DerivedV> & V,
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const Eigen::MatrixBase<DerivedF> & F,
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Eigen::SparseMatrix<Scalar>& L);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "cotmatrix.cpp"
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#endif
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#endif
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