61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2013 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_FACES_FIRST_H
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#define IGL_FACES_FIRST_H
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#include "igl_inline.h"
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namespace igl
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{
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// FACES_FIRST Reorder vertices so that vertices in face list come before
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// vertices that don't appear in the face list. This is especially useful if
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// the face list contains only surface faces and you want surface vertices
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// listed before internal vertices
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//
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// [RV,RT,RF,IM] = faces_first(V,T,F);
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//
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// Templates:
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// MatV matrix for vertex positions, e.g. MatrixXd
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// MatF matrix for face indices, e.g. MatrixXi
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// VecI vector for index map, e.g. VectorXi
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// Input:
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// V # vertices by 3 vertex positions
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// F # faces by 3 list of face indices
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// Output:
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// RV # vertices by 3 vertex positions, order such that if the jth vertex is
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// some face in F, and the kth vertex is not then j comes before k
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// RF # faces by 3 list of face indices, reindexed to use RV
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// IM #V by 1 list of indices such that: RF = IM(F) and RT = IM(T)
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// and RV(IM,:) = V
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//
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//
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// Example:
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// // Tet mesh in (V,T,F)
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// faces_first(V,F,IM);
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// T = T.unaryExpr(bind1st(mem_fun( static_cast<VectorXi::Scalar&
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// (VectorXi::*)(VectorXi::Index)>(&VectorXi::operator())),
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// &IM)).eval();
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template <typename MatV, typename MatF, typename VecI>
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IGL_INLINE void faces_first(
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const MatV & V,
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const MatF & F,
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MatV & RV,
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MatF & RF,
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VecI & IM);
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// Virtual "in place" wrapper
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template <typename MatV, typename MatF, typename VecI>
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IGL_INLINE void faces_first(
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MatV & V,
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MatF & F,
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VecI & IM);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "faces_first.cpp"
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#endif
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#endif
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