Changed OpenMesh directory structure
git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@106 fdac6126-5c0c-442c-9429-916003d36597
This commit is contained in:
Jan Möbius
451
src/OpenMesh/Tools/Subdivider/Uniform/LoopT.hh
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451
src/OpenMesh/Tools/Subdivider/Uniform/LoopT.hh
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//=============================================================================
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//
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// OpenMesh
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// Copyright (C) 2003 by Computer Graphics Group, RWTH Aachen
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// www.openmesh.org
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//
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//-----------------------------------------------------------------------------
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//
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// License
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, version 2.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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//-----------------------------------------------------------------------------
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//
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// $Revision$
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// $Date$
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//
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//=============================================================================
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/** \file LoopT.hh
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*/
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//=============================================================================
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//
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// CLASS LoopT
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//
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//=============================================================================
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#ifndef OPENMESH_SUBDIVIDER_UNIFORM_LOOPT_HH
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#define OPENMESH_SUBDIVIDER_UNIFORM_LOOPT_HH
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//== INCLUDES =================================================================
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#include <OpenMesh/Core/System/config.hh>
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#include <OpenMesh/Tools/Subdivider/Uniform/SubdividerT.hh>
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#include <OpenMesh/Core/Utils/vector_cast.hh>
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// -------------------- STL
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#include <vector>
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#if defined(OM_CC_MIPS)
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# include <math.h>
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#else
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# include <cmath>
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#endif
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//== NAMESPACE ================================================================
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namespace OpenMesh { // BEGIN_NS_OPENMESH
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namespace Subdivider { // BEGIN_NS_DECIMATER
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namespace Uniform { // BEGIN_NS_DECIMATER
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//== CLASS DEFINITION =========================================================
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/** %Uniform Loop subdivision algorithm.
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*
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* Implementation as described in
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*
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* C. T. Loop, "Smooth Subdivision Surfaces Based on Triangles",
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* M.S. Thesis, Department of Mathematics, University of Utah, August 1987.
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*
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*/
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template <typename MeshType, typename RealType = float>
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class LoopT : public SubdividerT<MeshType, RealType>
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{
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public:
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typedef RealType real_t;
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typedef MeshType mesh_t;
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typedef SubdividerT< mesh_t, real_t > parent_t;
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typedef std::pair< real_t, real_t > weight_t;
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typedef std::vector< std::pair<real_t,real_t> > weights_t;
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public:
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LoopT(void) : parent_t(), _1over8( 1.0/8.0 ), _3over8( 3.0/8.0 )
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{ init_weights(); }
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LoopT( mesh_t& _m ) : parent_t(_m), _1over8( 1.0/8.0 ), _3over8( 3.0/8.0 )
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{ init_weights(); }
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~LoopT() {}
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public:
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const char *name() const { return "Uniform Loop"; }
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/// Pre-compute weights
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void init_weights(size_t _max_valence=50)
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{
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weights_.resize(_max_valence);
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std::generate(weights_.begin(), weights_.end(), compute_weight());
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}
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protected:
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bool prepare( mesh_t& _m )
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{
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_m.add_property( vp_pos_ );
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_m.add_property( ep_pos_ );
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return true;
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}
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bool cleanup( mesh_t& _m )
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{
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_m.remove_property( vp_pos_ );
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_m.remove_property( ep_pos_ );
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return true;
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}
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bool subdivide( mesh_t& _m, size_t _n)
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{
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typename mesh_t::FaceIter fit, f_end;
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typename mesh_t::EdgeIter eit, e_end;
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typename mesh_t::VertexIter vit;
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// Do _n subdivisions
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for (size_t i=0; i < _n; ++i)
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{
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// compute new positions for old vertices
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for ( vit = _m.vertices_begin();
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vit != _m.vertices_end(); ++vit)
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smooth( _m, vit.handle() );
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// Compute position for new vertices and store them in the edge property
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for (eit=_m.edges_begin(); eit != _m.edges_end(); ++eit)
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compute_midpoint( _m, eit.handle() );
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// Split each edge at midpoint and store precomputed positions (stored in
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// edge property ep_pos_) in the vertex property vp_pos_;
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// Attention! Creating new edges, hence make sure the loop ends correctly.
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e_end = _m.edges_end();
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for (eit=_m.edges_begin(); eit != e_end; ++eit)
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split_edge(_m, eit.handle() );
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// Commit changes in topology and reconsitute consistency
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// Attention! Creating new faces, hence make sure the loop ends correctly.
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f_end = _m.faces_end();
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for (fit = _m.faces_begin(); fit != f_end; ++fit)
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split_face(_m, fit.handle() );
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// Commit changes in geometry
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for ( vit = _m.vertices_begin();
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vit != _m.vertices_end(); ++vit)
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_m.set_point(vit, _m.property( vp_pos_, vit ) );
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#if defined(_DEBUG) || defined(DEBUG)
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// Now we have an consistent mesh!
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assert( OpenMesh::Utils::MeshCheckerT<mesh_t>(_m).check() );
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#endif
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}
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return true;
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}
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private:
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/// Helper functor to compute weights for Loop-subdivision
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/// \internal
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struct compute_weight
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{
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compute_weight() : valence(-1) { }
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weight_t operator() (void)
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{
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#if !defined(OM_CC_MIPS)
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using std::cos;
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#endif
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// 1
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// alpha(n) = ---- * (40 - ( 3 + 2 cos( 2 Pi / n ) )<29> )
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// 64
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if (++valence)
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{
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double inv_v = 1.0/double(valence);
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double t = (3.0 + 2.0 * cos( 2.0 * M_PI * inv_v) );
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double alpha = (40.0 - t * t)/64.0;
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return weight_t( 1.0-alpha, inv_v*alpha);
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}
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return weight_t(0.0, 0.0);
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}
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int valence;
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};
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private: // topological modifiers
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void split_face(mesh_t& _m, const typename mesh_t::FaceHandle& _fh)
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{
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typename mesh_t::HalfedgeHandle
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heh1(_m.halfedge_handle(_fh)),
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heh2(_m.next_halfedge_handle(_m.next_halfedge_handle(heh1))),
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heh3(_m.next_halfedge_handle(_m.next_halfedge_handle(heh2)));
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// Cutting off every corner of the 6_gon
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corner_cutting( _m, heh1 );
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corner_cutting( _m, heh2 );
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corner_cutting( _m, heh3 );
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}
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void corner_cutting(mesh_t& _m, const typename mesh_t::HalfedgeHandle& _he)
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{
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// Define Halfedge Handles
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typename mesh_t::HalfedgeHandle
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heh1(_he),
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heh5(heh1),
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heh6(_m.next_halfedge_handle(heh1));
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// Cycle around the polygon to find correct Halfedge
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for (; _m.next_halfedge_handle(_m.next_halfedge_handle(heh5)) != heh1;
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heh5 = _m.next_halfedge_handle(heh5))
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{}
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typename mesh_t::VertexHandle
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vh1 = _m.to_vertex_handle(heh1),
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vh2 = _m.to_vertex_handle(heh5);
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typename mesh_t::HalfedgeHandle
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heh2(_m.next_halfedge_handle(heh5)),
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heh3(_m.new_edge( vh1, vh2)),
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heh4(_m.opposite_halfedge_handle(heh3));
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/* Intermediate result
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*
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* *
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* 5 /|\
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* /_ \
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* vh2> * *
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* /|\3 |\
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* /_ \|4 \
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* *----\*----\*
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* 1 ^ 6
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* vh1 (adjust_outgoing halfedge!)
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*/
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// Old and new Face
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typename mesh_t::FaceHandle fh_old(_m.face_handle(heh6));
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typename mesh_t::FaceHandle fh_new(_m.new_face());
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// Re-Set Handles around old Face
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_m.set_next_halfedge_handle(heh4, heh6);
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_m.set_next_halfedge_handle(heh5, heh4);
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_m.set_face_handle(heh4, fh_old);
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_m.set_face_handle(heh5, fh_old);
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_m.set_face_handle(heh6, fh_old);
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_m.set_halfedge_handle(fh_old, heh4);
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// Re-Set Handles around new Face
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_m.set_next_halfedge_handle(heh1, heh3);
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_m.set_next_halfedge_handle(heh3, heh2);
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_m.set_face_handle(heh1, fh_new);
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_m.set_face_handle(heh2, fh_new);
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_m.set_face_handle(heh3, fh_new);
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_m.set_halfedge_handle(fh_new, heh1);
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}
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void split_edge(mesh_t& _m, const typename mesh_t::EdgeHandle& _eh)
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{
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typename mesh_t::HalfedgeHandle
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heh = _m.halfedge_handle(_eh, 0),
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opp_heh = _m.halfedge_handle(_eh, 1);
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typename mesh_t::HalfedgeHandle new_heh, opp_new_heh, t_heh;
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typename mesh_t::VertexHandle vh;
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typename mesh_t::VertexHandle vh1(_m.to_vertex_handle(heh));
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typename mesh_t::Point zero(0,0,0);
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// new vertex
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vh = _m.new_vertex( zero );
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// memorize position, will be set later
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_m.property( vp_pos_, vh ) = _m.property( ep_pos_, _eh );
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// Re-link mesh entities
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if (_m.is_boundary(_eh))
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{
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for (t_heh = heh;
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_m.next_halfedge_handle(t_heh) != opp_heh;
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t_heh = _m.opposite_halfedge_handle(_m.next_halfedge_handle(t_heh)))
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{}
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}
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else
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{
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for (t_heh = _m.next_halfedge_handle(opp_heh);
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_m.next_halfedge_handle(t_heh) != opp_heh;
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t_heh = _m.next_halfedge_handle(t_heh) )
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{}
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}
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new_heh = _m.new_edge(vh, vh1);
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opp_new_heh = _m.opposite_halfedge_handle(new_heh);
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_m.set_vertex_handle( heh, vh );
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_m.set_next_halfedge_handle(t_heh, opp_new_heh);
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_m.set_next_halfedge_handle(new_heh, _m.next_halfedge_handle(heh));
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_m.set_next_halfedge_handle(heh, new_heh);
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_m.set_next_halfedge_handle(opp_new_heh, opp_heh);
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if (_m.face_handle(opp_heh).is_valid())
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{
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_m.set_face_handle(opp_new_heh, _m.face_handle(opp_heh));
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_m.set_halfedge_handle(_m.face_handle(opp_new_heh), opp_new_heh);
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}
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_m.set_face_handle( new_heh, _m.face_handle(heh) );
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_m.set_halfedge_handle( vh, new_heh);
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_m.set_halfedge_handle( _m.face_handle(heh), heh );
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_m.set_halfedge_handle( vh1, opp_new_heh );
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// Never forget this, when playing with the topology
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_m.adjust_outgoing_halfedge( vh );
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_m.adjust_outgoing_halfedge( vh1 );
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}
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private: // geometry helper
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void compute_midpoint(mesh_t& _m, const typename mesh_t::EdgeHandle& _eh)
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{
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#define V( X ) vector_cast< typename mesh_t::Normal >( X )
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typename mesh_t::HalfedgeHandle heh, opp_heh;
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heh = _m.halfedge_handle( _eh, 0);
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opp_heh = _m.halfedge_handle( _eh, 1);
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typename mesh_t::Point
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pos(_m.point(_m.to_vertex_handle(heh)));
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pos += V( _m.point(_m.to_vertex_handle(opp_heh)) );
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// boundary edge: just average vertex positions
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if (_m.is_boundary(_eh) )
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{
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pos *= 0.5;
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}
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else // inner edge: add neighbouring Vertices to sum
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{
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pos *= real_t(3.0);
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pos += V(_m.point(_m.to_vertex_handle(_m.next_halfedge_handle(heh))));
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pos += V(_m.point(_m.to_vertex_handle(_m.next_halfedge_handle(opp_heh))));
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pos *= _1over8;
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}
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_m.property( ep_pos_, _eh ) = pos;
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#undef V
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}
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void smooth(mesh_t& _m, const typename mesh_t::VertexHandle& _vh)
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{
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typename mesh_t::Point pos(0.0,0.0,0.0);
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if (_m.is_boundary(_vh)) // if boundary: Point 1-6-1
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{
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typename mesh_t::HalfedgeHandle heh, prev_heh;
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heh = _m.halfedge_handle( _vh );
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if ( heh.is_valid() )
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{
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assert( _m.is_boundary( _m.edge_handle( heh ) ) );
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prev_heh = _m.prev_halfedge_handle( heh );
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typename mesh_t::VertexHandle
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to_vh = _m.to_vertex_handle( heh ),
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from_vh = _m.from_vertex_handle( prev_heh );
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// ( v_l + 6 v + v_r ) / 8
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pos = _m.point( _vh );
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pos *= real_t(6.0);
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pos += vector_cast< typename mesh_t::Normal >( _m.point( to_vh ) );
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pos += vector_cast< typename mesh_t::Normal >( _m.point( from_vh ) );
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pos *= _1over8;
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}
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else
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return;
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}
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else // inner vertex: (1-a) * p + a/n * Sum q, q in one-ring of p
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{
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typedef typename mesh_t::Normal Vec;
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typename mesh_t::VertexVertexIter vvit;
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size_t valence(0);
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// Calculate Valence and sum up neighbour points
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for (vvit=_m.vv_iter(_vh); vvit; ++vvit) {
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++valence;
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pos += vector_cast< Vec >( _m.point(vvit) );
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}
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pos *= weights_[valence].second; // alpha(n)/n * Sum q, q in one-ring of p
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pos += weights_[valence].first
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* vector_cast<Vec>(_m.point(_vh)); // + (1-a)*p
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}
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_m.property( vp_pos_, _vh ) = pos;
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}
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private: // data
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OpenMesh::VPropHandleT< typename mesh_t::Point > vp_pos_;
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OpenMesh::EPropHandleT< typename mesh_t::Point > ep_pos_;
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weights_t weights_;
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const real_t _1over8;
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const real_t _3over8;
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};
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//=============================================================================
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} // END_NS_UNIFORM
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} // END_NS_SUBDIVIDER
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} // END_NS_OPENMESH
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//=============================================================================
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#endif // OPENMESH_SUBDIVIDER_UNIFORM_COMPOSITELOOPT_HH defined
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//=============================================================================
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