Added Sqrt3InterpolatingSubdividerLabsikGreinerT and ModifiedButterFlyT (Thanks to Clément Courbet for providing the code)
git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@341 fdac6126-5c0c-442c-9429-916003d36597
This commit is contained in:
Jan Möbius
543
src/OpenMesh/Tools/Subdivider/Uniform/ModifiedButterFlyT.hh
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543
src/OpenMesh/Tools/Subdivider/Uniform/ModifiedButterFlyT.hh
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@@ -0,0 +1,543 @@
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/*===========================================================================*\
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* *
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* OpenMesh *
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* Copyright (C) 2001-2010 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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* This file is part of OpenMesh. *
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* *
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* OpenMesh is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License as *
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* published by the Free Software Foundation, either version 3 of *
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* the License, or (at your option) any later version with the *
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* following exceptions: *
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* *
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* If other files instantiate templates or use macros *
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* or inline functions from this file, or you compile this file and *
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* link it with other files to produce an executable, this file does *
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* not by itself cause the resulting executable to be covered by the *
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* GNU Lesser General Public License. This exception does not however *
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* invalidate any other reasons why the executable file might be *
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* covered by the GNU Lesser General Public License. *
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* *
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* OpenMesh is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU LesserGeneral Public *
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* License along with OpenMesh. If not, *
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* see <http://www.gnu.org/licenses/>. *
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* *
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\*==========================================================================*/
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/*==========================================================================*\
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* *
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* $Revision: 410 $ *
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* $Date: 2010-06-17 12:45:58 +0200 (Do, 17. Jun 2010) $ *
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* *
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\*==========================================================================*/
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/** \file ModifiedButterflyT.hh
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The modified butterfly scheme of Denis Zorin, Peter Schröder and Wim Sweldens,
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``Interpolating subdivision for meshes with arbitrary topology,'' in Proceedings
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of SIGGRAPH 1996, ACM SIGGRAPH, 1996, pp. 189-192.
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Clement Courbet - clement.courbet@ecp.fr
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*/
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//=============================================================================
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//
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// CLASS ModifiedButterflyT
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//
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//=============================================================================
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#ifndef SP_MODIFIED_BUTTERFLY_H
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#define SP_MODIFIED_BUTTERFLY_H
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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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#include <OpenMesh/Core/Utils/Property.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_UNIFORM
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//== CLASS DEFINITION =========================================================
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template <typename MeshType, typename RealType = float>
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class ModifiedButterflyT : 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::vector< std::vector<real_t> > weights_t;
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typedef std::vector<real_t> weight_t;
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public:
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ModifiedButterflyT() : parent_t()
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{ init_weights(); }
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ModifiedButterflyT( mesh_t& _m) : parent_t(_m)
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{ init_weights(); }
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~ModifiedButterflyT() {}
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public:
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const char *name() const { return "Uniform Spectral"; }
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/// Pre-compute weights
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void init_weights(size_t _max_valence=20)
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{
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weights.resize(_max_valence);
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//special case: K==3, K==4
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weights[3].resize(4);
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weights[3][0] = real_t(5.0)/12;
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weights[3][1] = real_t(-1.0)/12;
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weights[3][2] = real_t(-1.0)/12;
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weights[3][3] = real_t(3.0)/4;
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weights[4].resize(5);
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weights[4][0] = real_t(3.0)/8;
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weights[4][1] = 0;
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weights[4][2] = real_t(-1.0)/8;
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weights[4][3] = 0;
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weights[4][4] = real_t(3.0)/4;
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for(unsigned int K = 5; K<_max_valence; ++K)
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{
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weights[K].resize(K+1);
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// s(j) = ( 1/4 + cos(2*pi*j/K) + 1/2 * cos(4*pi*j/K) )/K
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real_t invK = 1.0/real_t(K);
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real_t sum = 0;
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for(unsigned int j=0; j<K; ++j)
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{
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weights[K][j] = (0.25 + cos(2.0*M_PI*j*invK) + 0.5*cos(4.0*M_PI*j*invK))*invK;
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sum += weights[K][j];
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}
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weights[K][K] = (real_t)1.0 - sum;
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}
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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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// This is an interpolating scheme, old vertices remain the same.
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typename mesh_t::VertexIter initialVerticesEnd = _m.vertices_end();
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for ( vit = _m.vertices_begin(); vit != initialVerticesEnd; ++vit)
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_m.property( vp_pos_, vit.handle() ) = _m.point(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 = /*initialVerticesEnd;*/_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: // 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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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 pos(0,0,0);
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typename mesh_t::VertexHandle a_0(_m.to_vertex_handle(heh));
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typename mesh_t::VertexHandle a_1(_m.to_vertex_handle(opp_heh));
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// boundary edge: 4-point scheme
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if (_m.is_boundary(_eh) )
|
||||
{
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pos = _m.point(a_0);
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pos += _m.point(a_1);
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pos *= 9.0/16;
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typename mesh_t::Point tpos;
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if(_m.is_boundary(heh))
|
||||
{
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tpos = _m.point(_m.to_vertex_handle(_m.next_halfedge_handle(heh)));
|
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tpos += _m.point(_m.to_vertex_handle(_m.opposite_halfedge_handle(_m.prev_halfedge_handle(heh))));
|
||||
}
|
||||
else
|
||||
{
|
||||
assert(_m.is_boundary(opp_heh));
|
||||
tpos = _m.point(_m.to_vertex_handle(_m.next_halfedge_handle(opp_heh)));
|
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tpos += _m.point(_m.to_vertex_handle(_m.opposite_halfedge_handle(_m.prev_halfedge_handle(opp_heh))));
|
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}
|
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tpos *= -1.0/16;
|
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pos += tpos;
|
||||
}
|
||||
else
|
||||
{
|
||||
int valence_a_0 = _m.valence(a_0);
|
||||
int valence_a_1 = _m.valence(a_1);
|
||||
assert(valence_a_0>2);
|
||||
assert(valence_a_1>2);
|
||||
|
||||
if( (valence_a_0==6 && valence_a_1==6) || (_m.is_boundary(a_0) && valence_a_1==6) || (_m.is_boundary(a_1) && valence_a_0==6) || (_m.is_boundary(a_0) && _m.is_boundary(a_1)) )// use 8-point scheme
|
||||
{
|
||||
real_t alpha = real_t(1.0/2);
|
||||
real_t beta = real_t(1.0/8);
|
||||
real_t gamma = real_t(-1.0/16);
|
||||
|
||||
//get points
|
||||
typename mesh_t::VertexHandle b_0, b_1, c_0, c_1, c_2, c_3;
|
||||
typename mesh_t::HalfedgeHandle t_he;
|
||||
|
||||
t_he = _m.next_halfedge_handle(_m.opposite_halfedge_handle(heh));
|
||||
b_0 = _m.to_vertex_handle(t_he);
|
||||
if(!_m.is_boundary(_m.opposite_halfedge_handle(t_he)))
|
||||
{
|
||||
t_he = _m.next_halfedge_handle(_m.opposite_halfedge_handle(t_he));
|
||||
c_0 = _m.to_vertex_handle(t_he);
|
||||
}
|
||||
|
||||
t_he = _m.opposite_halfedge_handle(_m.prev_halfedge_handle(heh));
|
||||
b_1 = _m.to_vertex_handle(t_he);
|
||||
if(!_m.is_boundary(t_he))
|
||||
{
|
||||
t_he = _m.opposite_halfedge_handle(_m.prev_halfedge_handle(t_he));
|
||||
c_1 = _m.to_vertex_handle(t_he);
|
||||
}
|
||||
|
||||
t_he = _m.next_halfedge_handle(_m.opposite_halfedge_handle(opp_heh));
|
||||
assert(b_1.idx()==_m.to_vertex_handle(t_he).idx());
|
||||
if(!_m.is_boundary(_m.opposite_halfedge_handle(t_he)))
|
||||
{
|
||||
t_he = _m.next_halfedge_handle(_m.opposite_halfedge_handle(t_he));
|
||||
c_2 = _m.to_vertex_handle(t_he);
|
||||
}
|
||||
|
||||
t_he = _m.opposite_halfedge_handle(_m.prev_halfedge_handle(opp_heh));
|
||||
assert(b_0==_m.to_vertex_handle(t_he));
|
||||
if(!_m.is_boundary(t_he))
|
||||
{
|
||||
t_he = _m.opposite_halfedge_handle(_m.prev_halfedge_handle(t_he));
|
||||
c_3 = _m.to_vertex_handle(t_he);
|
||||
}
|
||||
|
||||
//compute position.
|
||||
//a0,a1,b0,b1 must exist.
|
||||
assert(a_0.is_valid());
|
||||
assert(a_1.is_valid());
|
||||
assert(b_0.is_valid());
|
||||
assert(b_1.is_valid());
|
||||
//The other vertices may be created from symmetry is they are on the other side of the boundary.
|
||||
|
||||
pos = _m.point(a_0);
|
||||
pos += _m.point(a_1);
|
||||
pos *= alpha;
|
||||
|
||||
typename mesh_t::Point tpos ( _m.point(b_0) );
|
||||
tpos += _m.point(b_1);
|
||||
tpos *= beta;
|
||||
pos += tpos;
|
||||
|
||||
typename mesh_t::Point pc_0, pc_1, pc_2, pc_3;
|
||||
if(c_0.is_valid())
|
||||
pc_0 = _m.point(c_0);
|
||||
else //create the point by symmetry
|
||||
{
|
||||
pc_0 = _m.point(a_1) + _m.point(b_0) - _m.point(a_0);
|
||||
}
|
||||
if(c_1.is_valid())
|
||||
pc_1 = _m.point(c_1);
|
||||
else //create the point by symmetry
|
||||
{
|
||||
pc_1 = _m.point(a_1) + _m.point(b_1) - _m.point(a_0);
|
||||
}
|
||||
if(c_2.is_valid())
|
||||
pc_2 = _m.point(c_2);
|
||||
else //create the point by symmetry
|
||||
{
|
||||
pc_2 = _m.point(a_0) + _m.point(b_1) - _m.point(a_1);
|
||||
}
|
||||
if(c_3.is_valid())
|
||||
pc_3 = _m.point(c_3);
|
||||
else //create the point by symmetry
|
||||
{
|
||||
pc_3 = _m.point(a_0) + _m.point(b_0) - _m.point(a_1);
|
||||
}
|
||||
tpos = pc_0;
|
||||
tpos += pc_1;
|
||||
tpos += pc_2;
|
||||
tpos += pc_3;
|
||||
tpos *= gamma;
|
||||
pos += tpos;
|
||||
}
|
||||
else //at least one endpoint is [irregular and not in boundary]
|
||||
{
|
||||
double normFactor = 0.0;
|
||||
|
||||
if(valence_a_0!=6 && !_m.is_boundary(a_0))
|
||||
{
|
||||
assert((int)weights[valence_a_0].size()==valence_a_0+1);
|
||||
typename mesh_t::HalfedgeHandle t_he = opp_heh;
|
||||
for(int i = 0; i < valence_a_0 ; t_he=_m.next_halfedge_handle(_m.opposite_halfedge_handle(t_he)), ++i)
|
||||
{
|
||||
pos += weights[valence_a_0][i] * _m.point(_m.to_vertex_handle(t_he));
|
||||
}
|
||||
assert(t_he==opp_heh);
|
||||
|
||||
//add irregular vertex:
|
||||
pos += weights[valence_a_0][valence_a_0] * _m.point(a_0);
|
||||
++normFactor;
|
||||
}
|
||||
|
||||
if(valence_a_1!=6 && !_m.is_boundary(a_1))
|
||||
{
|
||||
assert((int)weights[valence_a_1].size()==valence_a_1+1);
|
||||
typename mesh_t::HalfedgeHandle t_he = heh;
|
||||
for(int i = 0; i < valence_a_1 ; t_he=_m.next_halfedge_handle(_m.opposite_halfedge_handle(t_he)), ++i)
|
||||
{
|
||||
pos += weights[valence_a_1][i] * _m.point(_m.to_vertex_handle(t_he));
|
||||
}
|
||||
assert(t_he==heh);
|
||||
//add irregular vertex:
|
||||
pos += weights[valence_a_1][valence_a_1] * _m.point(a_1);
|
||||
++normFactor;
|
||||
}
|
||||
|
||||
assert(normFactor>0.1); //normFactor should be 1 or 2
|
||||
|
||||
//if both vertices are irregular, average positions:
|
||||
pos /= normFactor;
|
||||
}
|
||||
}
|
||||
_m.property( ep_pos_, _eh ) = pos;
|
||||
}
|
||||
|
||||
private: // data
|
||||
|
||||
OpenMesh::VPropHandleT< typename mesh_t::Point > vp_pos_;
|
||||
OpenMesh::EPropHandleT< typename mesh_t::Point > ep_pos_;
|
||||
|
||||
weights_t weights;
|
||||
|
||||
};
|
||||
|
||||
} // END_NS_UNIFORM
|
||||
} // END_NS_SUBDIVIDER
|
||||
} // END_NS_OPENMESH
|
||||
#endif
|
||||
|
||||
Reference in New Issue
Block a user