59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
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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) 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_FACE_AREAS_H
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#define IGL_FACE_AREAS_H
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#include "igl_inline.h"
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#include <Eigen/Dense>
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namespace igl
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{
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// Constructs a list of face areas of faces opposite each index in a tet list
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//
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// Inputs:
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// V #V by 3 list of mesh vertex positions
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// T #T by 3 list of tet mesh indices into V
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// Outputs:
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// A #T by 4 list of face areas corresponding to faces opposite vertices
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// 0,1,2,3
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//
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template <typename DerivedV, typename DerivedT, typename DerivedA>
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IGL_INLINE void face_areas(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedT>& T,
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Eigen::PlainObjectBase<DerivedA>& A);
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// Compute tet-mesh face areas from edge lengths.
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//
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// Inputs:
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// L #T by 6 list of tet-mesh edge lengths corresponding to edges
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// [3 0],[3 1],[3 2],[1 2],[2 0],[0 1]
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// Outputs:
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// A #T by 4 list of face areas corresponding to faces opposite vertices
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// 0,1,2,3: i.e. made of edges [123],[024],[015],[345]
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//
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//
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template <typename DerivedL, typename DerivedA>
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IGL_INLINE void face_areas(
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const Eigen::MatrixBase<DerivedL>& L,
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Eigen::PlainObjectBase<DerivedA>& A);
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// doublearea_nan_replacement See doublearea.h
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template <typename DerivedL, typename DerivedA>
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IGL_INLINE void face_areas(
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const Eigen::MatrixBase<DerivedL>& L,
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const typename DerivedL::Scalar doublearea_nan_replacement,
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Eigen::PlainObjectBase<DerivedA>& A);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "face_areas.cpp"
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#endif
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#endif
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