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71 lines
2.7 KiB
C++
71 lines
2.7 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 Daniele Panozzo <daniele.panozzo@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_VERTEX_TRIANGLE_ADJACENCY_H
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#define IGL_VERTEX_TRIANGLE_ADJACENCY_H
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#include "igl_inline.h"
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#include <Eigen/Dense>
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#include <vector>
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namespace igl
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{
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// vertex_face_adjacency constructs the vertex-face topology of a given mesh (V,F)
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//
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// Inputs:
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// //V #V by 3 list of vertex coordinates
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// n number of vertices #V (e.g. `F.maxCoeff()+1` or `V.rows()`)
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// F #F by dim list of mesh faces (must be triangles)
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// Outputs:
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// VF #V list of lists of incident faces (adjacency list)
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// VI #V list of lists of index of incidence within incident faces listed
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// in VF
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//
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// See also: edges, cotmatrix, diag, vv
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//
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// Known bugs: this should not take V as an input parameter.
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// Known bugs/features: if a facet is combinatorially degenerate then faces
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// will appear multiple times in VF and correspondingly in VFI (j appears
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// twice in F.row(i) then i will appear twice in VF[j])
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template <typename DerivedF, typename VFType, typename VFiType>
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IGL_INLINE void vertex_triangle_adjacency(
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const typename DerivedF::Scalar n,
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const Eigen::MatrixBase<DerivedF>& F,
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std::vector<std::vector<VFType> >& VF,
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std::vector<std::vector<VFiType> >& VFi);
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template <typename DerivedV, typename DerivedF, typename IndexType>
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IGL_INLINE void vertex_triangle_adjacency(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedF>& F,
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std::vector<std::vector<IndexType> >& VF,
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std::vector<std::vector<IndexType> >& VFi);
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// Inputs:
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// F #F by 3 list of triangle indices into some vertex list V
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// n number of vertices, #V (e.g., F.maxCoeff()+1)
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// Outputs:
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// VF 3*#F list List of faces indice on each vertex, so that VF(NI(i)+j) =
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// f, means that face f is the jth face (in no particular order) incident
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// on vertex i.
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// NI #V+1 list cumulative sum of vertex-triangle degrees with a
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// preceeding zero. "How many faces" have been seen before visiting this
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// vertex and its incident faces.
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template <
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typename DerivedF,
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typename DerivedVF,
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typename DerivedNI>
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IGL_INLINE void vertex_triangle_adjacency(
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const Eigen::MatrixBase<DerivedF> & F,
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const int n,
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Eigen::PlainObjectBase<DerivedVF> & VF,
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Eigen::PlainObjectBase<DerivedNI> & NI);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "vertex_triangle_adjacency.cpp"
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#endif
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#endif
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