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89 lines
3.4 KiB
C++
89 lines
3.4 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 "hausdorff.h"
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#include "point_mesh_squared_distance.h"
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template <
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typename DerivedVA,
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typename DerivedFA,
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typename DerivedVB,
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typename DerivedFB,
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typename Scalar>
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IGL_INLINE void igl::hausdorff(
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const Eigen::PlainObjectBase<DerivedVA> & VA,
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const Eigen::PlainObjectBase<DerivedFA> & FA,
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const Eigen::PlainObjectBase<DerivedVB> & VB,
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const Eigen::PlainObjectBase<DerivedFB> & FB,
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Scalar & d)
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{
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using namespace Eigen;
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assert(VA.cols() == 3 && "VA should contain 3d points");
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assert(FA.cols() == 3 && "FA should contain triangles");
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assert(VB.cols() == 3 && "VB should contain 3d points");
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assert(FB.cols() == 3 && "FB should contain triangles");
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Matrix<Scalar,Dynamic,1> sqr_DBA,sqr_DAB;
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Matrix<typename DerivedVA::Index,Dynamic,1> I;
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Matrix<typename DerivedVA::Scalar,Dynamic,3> C;
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point_mesh_squared_distance(VB,VA,FA,sqr_DBA,I,C);
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point_mesh_squared_distance(VA,VB,FB,sqr_DAB,I,C);
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const Scalar dba = sqr_DBA.maxCoeff();
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const Scalar dab = sqr_DAB.maxCoeff();
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d = sqrt(std::max(dba,dab));
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}
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template <
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typename DerivedV,
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typename Scalar>
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IGL_INLINE void igl::hausdorff(
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const Eigen::MatrixBase<DerivedV>& V,
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const std::function<Scalar(const Scalar &,const Scalar &, const Scalar &)> & dist_to_B,
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Scalar & l,
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Scalar & u)
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{
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// e 3-long vector of opposite edge lengths
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Eigen::Matrix<typename DerivedV::Scalar,1,3> e;
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// Maximum edge length
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Scalar e_max = 0;
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for(int i=0;i<3;i++)
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{
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e(i) = (V.row((i+1)%3)-V.row((i+2)%3)).norm();
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e_max = std::max(e_max,e(i));
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}
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// Semiperimeter
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const Scalar s = (e(0)+e(1)+e(2))*0.5;
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// Area
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const Scalar A = sqrt(s*(s-e(0))*(s-e(1))*(s-e(2)));
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// Circumradius
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const Scalar R = e(0)*e(1)*e(2)/(4.*A);
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// inradius
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const Scalar r = A/s;
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// Initialize lower bound to ∞
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l = std::numeric_limits<Scalar>::infinity();
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// d 3-long vector of distance from each corner to B
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Eigen::Matrix<typename DerivedV::Scalar,1,3> d;
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Scalar u1 = std::numeric_limits<Scalar>::infinity();
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Scalar u2 = 0;
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for(int i=0;i<3;i++)
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{
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d(i) = dist_to_B(V(i,0),V(i,1),V(i,2));
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// Lower bound is simply the max over vertex distances
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l = std::max(d(i),l);
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// u1 is the minimum of corner distances + maximum adjacent edge
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u1 = std::min(u1,d(i) + std::max(e((i+1)%3),e((i+2)%3)));
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// u2 first takes the maximum over corner distances
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u2 = std::max(u2,d(i));
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}
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// u2 is the distance from the circumcenter/midpoint of obtuse edge plus the
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// largest corner distance
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u2 += (s-r>2.*R ? R : 0.5*e_max);
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u = std::min(u1,u2);
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}
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#ifdef IGL_STATIC_LIBRARY
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template void igl::hausdorff<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, double>(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, double&);
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#endif
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