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https://github.com/SoftFever/OrcaSlicer.git
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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.
86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// 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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#include "edge_collapse_is_valid.h"
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#include "collapse_edge.h"
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#include "circulation.h"
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#include "intersect.h"
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#include "unique.h"
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#include "list_to_matrix.h"
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#include <vector>
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IGL_INLINE bool igl::edge_collapse_is_valid(
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const int e,
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const Eigen::MatrixXi & F,
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const Eigen::MatrixXi & E,
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const Eigen::VectorXi & EMAP,
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const Eigen::MatrixXi & EF,
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const Eigen::MatrixXi & EI)
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{
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using namespace Eigen;
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using namespace std;
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// For consistency with collapse_edge.cpp, let's determine edge flipness
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// (though not needed to check validity)
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const int eflip = E(e,0)>E(e,1);
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// source and destination
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const int s = eflip?E(e,1):E(e,0);
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const int d = eflip?E(e,0):E(e,1);
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if(s == IGL_COLLAPSE_EDGE_NULL && d==IGL_COLLAPSE_EDGE_NULL)
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{
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return false;
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}
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// check if edge collapse is valid: intersection of vertex neighbors of s and
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// d should be exactly 2+(s,d) = 4
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// http://stackoverflow.com/a/27049418/148668
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{
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// all vertex neighbors around edge, including the two vertices of the edge
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const auto neighbors = [](
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const int e,
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const bool ccw,
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const Eigen::MatrixXi & F,
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const Eigen::MatrixXi & E,
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const Eigen::VectorXi & EMAP,
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const Eigen::MatrixXi & EF,
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const Eigen::MatrixXi & EI)
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{
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vector<int> N,uN;
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vector<int> V2Fe = circulation(e, ccw,F,E,EMAP,EF,EI);
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for(auto f : V2Fe)
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{
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N.push_back(F(f,0));
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N.push_back(F(f,1));
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N.push_back(F(f,2));
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}
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vector<size_t> _1,_2;
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igl::unique(N,uN,_1,_2);
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VectorXi uNm;
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list_to_matrix(uN,uNm);
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return uNm;
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};
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VectorXi Ns = neighbors(e, eflip,F,E,EMAP,EF,EI);
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VectorXi Nd = neighbors(e,!eflip,F,E,EMAP,EF,EI);
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VectorXi Nint = igl::intersect(Ns,Nd);
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if(Nint.size() != 4)
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{
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return false;
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}
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if(Ns.size() == 4 && Nd.size() == 4)
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{
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VectorXi NsNd(8);
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NsNd<<Ns,Nd;
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VectorXi Nun,_1,_2;
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igl::unique(NsNd,Nun,_1,_2);
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// single tet, don't collapse
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if(Nun.size() == 4)
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{
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return false;
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}
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}
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}
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return true;
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}
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