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122 lines
4.8 KiB
122 lines
4.8 KiB
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 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_DECIMATE_H
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#define IGL_DECIMATE_H
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#include "igl_inline.h"
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#include "decimate_callback_types.h"
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#include <Eigen/Core>
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namespace igl
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{
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// Assumes (V,F) is a manifold mesh (possibly with boundary) Collapses edges
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// until desired number of faces is achieved. This uses default edge cost and
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// merged vertex placement functions {edge length, edge midpoint}.
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//
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// Inputs:
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// V #V by dim list of vertex positions
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// F #F by 3 list of face indices into V.
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// max_m desired number of output faces
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// Outputs:
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// U #U by dim list of output vertex posistions (can be same ref as V)
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// G #G by 3 list of output face indices into U (can be same ref as G)
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// J #G list of indices into F of birth face
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// I #U list of indices into V of birth vertices
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// Returns true if m was reached (otherwise #G > m)
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IGL_INLINE bool decimate(
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const Eigen::MatrixXd & V,
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const Eigen::MatrixXi & F,
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const size_t max_m,
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Eigen::MatrixXd & U,
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Eigen::MatrixXi & G,
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Eigen::VectorXi & J,
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Eigen::VectorXi & I);
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// Inputs:
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// V #V by dim list of vertex positions
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// F #F by 3 list of face indices into V.
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// max_m desired number of output faces
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// Outputs:
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// U #U by dim list of output vertex posistions (can be same ref as V)
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// G #G by 3 list of output face indices into U (can be same ref as G)
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// J #G list of indices into F of birth face
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// Returns true if m was reached (otherwise #G > m)
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IGL_INLINE bool decimate(
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const Eigen::MatrixXd & V,
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const Eigen::MatrixXi & F,
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const size_t max_m,
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Eigen::MatrixXd & U,
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Eigen::MatrixXi & G,
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Eigen::VectorXi & J);
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// Assumes a **closed** manifold mesh. See igl::connect_boundary_to_infinity
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// and igl::decimate in decimate.cpp
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// is handling meshes with boundary by connecting all boundary edges with
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// dummy facets to infinity **and** modifying the stopping criteria.
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//
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// Inputs:
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// cost_and_placement function computing cost of collapsing an edge and 3d
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// position where it should be placed:
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// cost_and_placement(V,F,E,EMAP,EF,EI,cost,placement);
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// stopping_condition function returning whether to stop collapsing edges
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// based on current state. Guaranteed to be called after _successfully_
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// collapsing edge e removing edges (e,e1,e2) and faces (f1,f2):
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// bool should_stop =
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// stopping_condition(V,F,E,EMAP,EF,EI,Q,Qit,C,e,e1,e2,f1,f2);
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IGL_INLINE bool decimate(
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const Eigen::MatrixXd & V,
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const Eigen::MatrixXi & F,
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const decimate_cost_and_placement_callback & cost_and_placement,
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const decimate_stopping_condition_callback & stopping_condition,
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Eigen::MatrixXd & U,
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Eigen::MatrixXi & G,
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Eigen::VectorXi & J,
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Eigen::VectorXi & I);
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// Inputs:
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// pre_collapse callback called with index of edge whose collapse is about
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// to be attempted (see collapse_edge)
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// post_collapse callback called with index of edge whose collapse was
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// just attempted and a flag revealing whether this was successful (see
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// collapse_edge)
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IGL_INLINE bool decimate(
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const Eigen::MatrixXd & V,
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const Eigen::MatrixXi & F,
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const decimate_cost_and_placement_callback & cost_and_placement,
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const decimate_stopping_condition_callback & stopping_condition,
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const decimate_pre_collapse_callback & pre_collapse,
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const decimate_post_collapse_callback & post_collapse,
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Eigen::MatrixXd & U,
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Eigen::MatrixXi & G,
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Eigen::VectorXi & J,
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Eigen::VectorXi & I);
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// Inputs:
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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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IGL_INLINE bool decimate(
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const Eigen::MatrixXd & V,
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const Eigen::MatrixXi & F,
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const decimate_cost_and_placement_callback & cost_and_placement,
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const decimate_stopping_condition_callback & stopping_condition,
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const decimate_pre_collapse_callback & pre_collapse,
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const decimate_post_collapse_callback & post_collapse,
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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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Eigen::MatrixXd & U,
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Eigen::MatrixXi & G,
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Eigen::VectorXi & J,
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Eigen::VectorXi & I);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "decimate.cpp"
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#endif
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#endif
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