56 lines
1.9 KiB
C
56 lines
1.9 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) 2015 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_EDGE_FLAPS_H
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#define IGL_EDGE_FLAPS_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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namespace igl
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{
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// Determine "edge flaps": two faces on either side of a unique edge (assumes
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// edge-manifold mesh)
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//
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// Inputs:
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// F #F by 3 list of face indices
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// uE #uE by 2 list of edge indices into V.
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// EMAP #F*3 list of indices into uE, mapping each directed edge to unique
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// unique edge in uE
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// Outputs:
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// EF #E by 2 list of edge flaps, EF(e,0)=f means e=(i-->j) is the edge of
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// F(f,:) opposite the vth corner, where EI(e,0)=v. Similarly EF(e,1) "
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// e=(j->i)
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// EI #E by 2 list of edge flap corners (see above).
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//
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// See also: unique_edge_map
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//
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// TODO: This seems to be a duplicate of edge_topology.h
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// igl::edge_topology(V,F,etEV,etFE,etEF);
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// igl::edge_flaps(F,efE,efEMAP,efEF,efEI);
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// [~,I] = sort(efE,2)
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// all( efE(sub2ind(size(efE),repmat(1:size(efE,1),2,1)',I)) == etEV )
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// all( efEF(sub2ind(size(efE),repmat(1:size(efE,1),2,1)',I)) == etEF )
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// all(efEMAP(sub2ind(size(F),repmat(1:size(F,1),3,1)',repmat([1 2 3],size(F,1),1))) == etFE(:,[2 3 1]))
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IGL_INLINE void edge_flaps(
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const Eigen::MatrixXi & F,
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const Eigen::MatrixXi & uE,
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const Eigen::VectorXi & EMAP,
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Eigen::MatrixXi & EF,
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Eigen::MatrixXi & EI);
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// Only faces as input
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IGL_INLINE void edge_flaps(
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const Eigen::MatrixXi & F,
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Eigen::MatrixXi & uE,
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Eigen::VectorXi & EMAP,
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Eigen::MatrixXi & EF,
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Eigen::MatrixXi & EI);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "edge_flaps.cpp"
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#endif
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#endif
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