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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.
105 lines
3.6 KiB
C++
105 lines
3.6 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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#include "orientable_patches.h"
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#include "components.h"
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#include "sort.h"
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#include "unique_rows.h"
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#include <vector>
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#include <iostream>
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template <typename DerivedF, typename DerivedC, typename AScalar>
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IGL_INLINE void igl::orientable_patches(
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const Eigen::PlainObjectBase<DerivedF> & F,
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Eigen::PlainObjectBase<DerivedC> & C,
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Eigen::SparseMatrix<AScalar> & A)
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{
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using namespace Eigen;
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using namespace std;
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// simplex size
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assert(F.cols() == 3);
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// List of all "half"-edges: 3*#F by 2
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Matrix<typename DerivedF::Scalar, Dynamic, 2> allE,sortallE,uE;
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allE.resize(F.rows()*3,2);
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Matrix<int,Dynamic,2> IX;
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VectorXi IA,IC;
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allE.block(0*F.rows(),0,F.rows(),1) = F.col(1);
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allE.block(0*F.rows(),1,F.rows(),1) = F.col(2);
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allE.block(1*F.rows(),0,F.rows(),1) = F.col(2);
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allE.block(1*F.rows(),1,F.rows(),1) = F.col(0);
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allE.block(2*F.rows(),0,F.rows(),1) = F.col(0);
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allE.block(2*F.rows(),1,F.rows(),1) = F.col(1);
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// Sort each row
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sort(allE,2,true,sortallE,IX);
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//IC(i) tells us where to find sortallE(i,:) in uE:
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// so that sortallE(i,:) = uE(IC(i),:)
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unique_rows(sortallE,uE,IA,IC);
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// uE2FT(e,f) = 1 means face f is adjacent to unique edge e
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vector<Triplet<AScalar> > uE2FTijv(IC.rows());
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for(int e = 0;e<IC.rows();e++)
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{
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uE2FTijv[e] = Triplet<AScalar>(e%F.rows(),IC(e),1);
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}
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SparseMatrix<AScalar> uE2FT(F.rows(),uE.rows());
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uE2FT.setFromTriplets(uE2FTijv.begin(),uE2FTijv.end());
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// kill non-manifold edges
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for(int j=0; j<(int)uE2FT.outerSize();j++)
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{
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int degree = 0;
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for(typename SparseMatrix<AScalar>::InnerIterator it (uE2FT,j); it; ++it)
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{
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degree++;
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}
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// Iterate over inside
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if(degree > 2)
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{
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for(typename SparseMatrix<AScalar>::InnerIterator it (uE2FT,j); it; ++it)
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{
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uE2FT.coeffRef(it.row(),it.col()) = 0;
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}
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}
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}
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// Face-face Adjacency matrix
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SparseMatrix<AScalar> uE2F;
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uE2F = uE2FT.transpose().eval();
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A = uE2FT*uE2F;
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// All ones
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for(int j=0; j<A.outerSize();j++)
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{
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// Iterate over inside
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for(typename SparseMatrix<AScalar>::InnerIterator it (A,j); it; ++it)
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{
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if(it.value() > 1)
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{
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A.coeffRef(it.row(),it.col()) = 1;
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}
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}
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}
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//% Connected components are patches
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//%C = components(A); % alternative to graphconncomp from matlab_bgl
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//[~,C] = graphconncomp(A);
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// graph connected components
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components(A,C);
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}
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template <typename DerivedF, typename DerivedC>
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IGL_INLINE void igl::orientable_patches(
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const Eigen::PlainObjectBase<DerivedF> & F,
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Eigen::PlainObjectBase<DerivedC> & C)
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{
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Eigen::SparseMatrix<typename DerivedF::Scalar> A;
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return orientable_patches(F,C,A);
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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template void igl::orientable_patches<Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, 1, 0, -1, 1>, int>(Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&, Eigen::SparseMatrix<int, 0, int>&);
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template void igl::orientable_patches<Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
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#endif
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