55 lines
2.1 KiB
C++
55 lines
2.1 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_PROGRESSIVE_HULLS_COST_AND_PLACEMENT_H
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#define IGL_COPYLEFT_PROGRESSIVE_HULLS_COST_AND_PLACEMENT_H
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#include <Eigen/Core>
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#include "../igl_inline.h"
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namespace igl
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{
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namespace copyleft
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{
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// A "cost and placement" compatible with `igl::decimate` implementing the
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// "progressive hulls" algorithm in "Silhouette clipping" [Sander et al.
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// 2000]. This implementation fixes an issue that the original linear
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// program becomes unstable for flat patches by introducing a small
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// quadratic energy term pulling the collapsed edge toward its midpoint.
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// This function is not really meant to be called directly but rather
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// passed to `igl::decimate` as a handle.
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//
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// Inputs:
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// e index of edge to be collapsed
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// V #V by 3 list of vertex positions
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// F #F by 3 list of faces indices into V
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// E #E by 3 list of edges indices into V
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// EMAP #F*3 list of indices into E, mapping each directed edge to unique
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// unique edge in E
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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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// Outputs:
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// cost cost of collapsing edge e
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// p position to place collapsed vertex
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//
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IGL_INLINE void progressive_hulls_cost_and_placement(
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const int e,
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const Eigen::MatrixXd & V,
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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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double & cost,
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Eigen::RowVectorXd & p);
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}
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "progressive_hulls_cost_and_placement.cpp"
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#endif
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#endif
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