85 lines
3.2 KiB
C++
85 lines
3.2 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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#ifndef IGL_COPYLEFT_CGAL_OUTER_HULL_H
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#define IGL_COPYLEFT_CGAL_OUTER_HULL_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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namespace copyleft
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{
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namespace cgal
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{
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// Compute the "outer hull" of a piecewise constant winding number induce
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// triangle mesh (V,F).
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//
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// Inputs:
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// V #V by 3 list of vertex positions
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// F #F by 3 list of triangle indices into V
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// Outputs:
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// HV #HV by 3 list of output vertex positions
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// HF #HF by 3 list of output triangle indices into HV
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// J #HF list of indices into F
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// flip #HF list of whether facet was flipped when added to HF
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//
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedHV,
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typename DerivedHF,
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typename DerivedJ,
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typename Derivedflip>
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IGL_INLINE void outer_hull(
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const Eigen::PlainObjectBase<DerivedV> & V,
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const Eigen::PlainObjectBase<DerivedF> & F,
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Eigen::PlainObjectBase<DerivedHV> & HV,
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Eigen::PlainObjectBase<DerivedHF> & HF,
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Eigen::PlainObjectBase<DerivedJ> & J,
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Eigen::PlainObjectBase<Derivedflip> & flip);
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// Compute the "outer hull" of a potentially non-manifold mesh (V,F) whose
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// intersections have been "resolved" (e.g. using `cork` or
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// `igl::copyleft::cgal::selfintersect`). The outer hull is defined to be all facets
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// (regardless of orientation) for which there exists some path from infinity
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// to the face without intersecting any other facets. For solids, this is the
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// surface of the solid. In general this includes any thin "wings" or
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// "flaps". This implementation largely follows Section 3.6 of "Direct
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// repair of self-intersecting meshes" [Attene 2014].
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//
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// Note: This doesn't require the input mesh to be piecewise constant
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// winding number, but won't handle multiple non-nested connected
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// components.
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//
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// Inputs:
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// V #V by 3 list of vertex positions
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// F #F by 3 list of triangle indices into V
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// Outputs:
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// G #G by 3 list of output triangle indices into V
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// J #G list of indices into F
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// flip #F list of whether facet was added to G **and** flipped orientation
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// (false for faces not added to G)
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedG,
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typename DerivedJ,
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typename Derivedflip>
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IGL_INLINE void outer_hull_legacy(
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const Eigen::PlainObjectBase<DerivedV> & V,
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const Eigen::PlainObjectBase<DerivedF> & F,
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Eigen::PlainObjectBase<DerivedG> & G,
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Eigen::PlainObjectBase<DerivedJ> & J,
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Eigen::PlainObjectBase<Derivedflip> & flip);
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}
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}
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "outer_hull.cpp"
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#endif
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#endif
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