386 lines
12 KiB
C++
386 lines
12 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program 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 General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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$Log: not supported by cvs2svn $
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Revision 1.20 2007/01/19 09:13:09 cignoni
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Added Finalize() method to the interface
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Revision 1.19 2007/01/11 11:48:33 ganovelli
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currMetric inizialied to heap.front() (it was heap.back()- wrong)
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Revision 1.18 2006/12/11 14:09:44 ganovelli
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added missing initialization of currMetric
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Revision 1.17 2006/06/09 07:28:43 m_di_benedetto
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Corrected ClearHeap(): iterator "hi" not decrementable if it was the first of the container.
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Revision 1.16 2005/11/10 15:38:46 cignoni
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Added casts to remove warnings
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Revision 1.15 2005/10/02 23:23:52 cignoni
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Changed the sense of the < operator for heap: it is reversed according to the stl where highest score elements must float in the heap
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Completed TimeBudget Termination condition.
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Parametrized the ClearHeap procedure now there is a HeapSimplexRatio param. Removed dirty printf.
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Revision 1.14 2005/04/14 11:34:33 ponchio
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*** empty log message ***
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Revision 1.13 2005/01/19 10:33:50 cignoni
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Improved ClearHeap management
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Revision 1.12 2004/12/10 01:02:48 cignoni
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added an inline and removed loggng
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Revision 1.11 2004/12/03 21:14:39 ponchio
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Fixed memory leak...
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Revision 1.10 2004/11/23 10:37:17 cignoni
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Added a member with a cached copy of the floating Priority() value inside the HeapElem to optimize operator< in heap updating operator
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Revision 1.9 2004/11/05 10:03:47 fiorin
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Added ModifierType::TriEdgeFlipOp
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Revision 1.8 2004/10/25 07:02:56 ganovelli
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some inline function, logs on file (precompiler directive)
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Revision 1.7 2004/09/29 17:08:39 ganovelli
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changed > to < in heapelem comparison
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Revision 1.6 2004/09/28 09:57:08 cignoni
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Better Doxygen docs
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Revision 1.5 2004/09/15 10:40:20 ponchio
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typedef LocalOptimization HeapType -> public:
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Revision 1.4 2004/09/08 15:10:59 ganovelli
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*** empty log message ***
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Revision 1.3 2004/07/27 09:46:15 cignoni
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First working version of the LocalOptimization/Simplification Framework
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Revision 1.1 2004/07/15 12:04:14 ganovelli
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minor changes
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Revision 1.2 2004/07/09 10:22:56 ganovelli
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working draft
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Revision 1.1 2004/07/08 08:25:15 ganovelli
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first draft
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****************************************************************************/
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#ifndef __VCGLIB_LOCALOPTIMIZATION
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#define __VCGLIB_LOCALOPTIMIZATION
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#include<vector>
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#include<algorithm>
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#include<time.h>
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#include<math.h>
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namespace vcg{
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template<class MeshType>
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class LocalOptimization;
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enum ModifierType{ TetraEdgeCollapseOp, TriEdgeSwapOp, TriVertexSplitOp,
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TriEdgeCollapseOp,TetraEdgeSpliOpt,TetraEdgeSwapOp, TriEdgeFlipOp};
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/** \addtogroup tetramesh */
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/*@{*/
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/// This abstract class define which functions a local modification to be used in the LocalOptimization.
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template <class MeshType>
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class LocalModification
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{
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public:
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typedef typename LocalOptimization<MeshType>::HeapType HeapType;
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typedef typename MeshType::ScalarType ScalarType;
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inline LocalModification(){};
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virtual ~LocalModification(){};
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/// return the type of operation
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virtual ModifierType IsOfType() = 0 ;
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/// return true if the data have not changed since it was created
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virtual bool IsUpToDate() = 0 ;
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/// return true if no constraint disallow this operation to be performed (ex: change of topology in edge collapses)
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virtual bool IsFeasible() = 0;
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/// Compute the priority to be used in the heap
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virtual ScalarType ComputePriority()=0;
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/// Return the priority to be used in the heap (implement static priority)
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virtual ScalarType Priority() const =0;
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/// Perform the operation and return the variation in the number of simplicies (>0 is refinement, <0 is simplification)
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virtual void Execute(MeshType &m)=0;
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/// perform initialization
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static void Init(MeshType &m, HeapType&);
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virtual const char *Info(MeshType &) {return 0;}
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/// Update the heap as a consequence of this operation
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virtual void UpdateHeap(HeapType&)=0;
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}; //end class local modification
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/// LocalOptimization:
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/// This class implements the algorihms running on 0-1-2-3-simplicial complex that are based on local modification
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/// The local modification can be and edge_collpase, or an edge_swap, a vertex plit...as far as they implement
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/// the interface defined in LocalModification.
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/// Implementation note: in order to keep the local modification itself indepented by its use in this class, they are not
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/// really derived by LocalModification. Instead, a wrapper is done to this purpose (see vcg/complex/tetramesh/decimation/collapse.h)
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template<class MeshType>
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class LocalOptimization
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{
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public:
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LocalOptimization(MeshType &mm): m(mm){ ClearTermination();e=0.0;HeapSimplexRatio=5;}
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struct HeapElem;
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// scalar type
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typedef typename MeshType::ScalarType ScalarType;
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// type of the heap
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typedef typename std::vector<HeapElem> HeapType;
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// modification type
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typedef LocalModification <MeshType> LocModType;
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// modification Pointer type
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typedef LocalModification <MeshType> * LocModPtrType;
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/// termination conditions
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enum LOTermination {
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LOnSimplices = 0x01, // test number of simplicies
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LOnVertices = 0x02, // test number of verticies
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LOnOps = 0x04, // test number of operations
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LOMetric = 0x08, // test Metric (error, quality...instance dependent)
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LOTime = 0x10 // test how much time is passed since the start
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} ;
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int tf;
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int nPerfmormedOps,
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nTargetOps,
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nTargetSimplices,
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nTargetVertices;
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float timeBudget;
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int start;
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ScalarType currMetric;
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ScalarType targetMetric;
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// The ratio between Heap size and the number of simplices in the current mesh
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// When this value is exceeded a ClearHeap Start;
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float HeapSimplexRatio;
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void SetTerminationFlag (int v){tf |= v;}
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void ClearTerminationFlag (int v){tf &= ~v;}
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bool IsTerminationFlag (int v){return ((tf & v)!=0);}
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void SetTargetSimplices (int ts ){nTargetSimplices = ts; SetTerminationFlag(LOnSimplices); }
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void SetTargetVertices (int tv ){nTargetVertices = tv; SetTerminationFlag(LOnVertices); }
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void SetTargetOperations(int to ){nTargetOps = to; SetTerminationFlag(LOnOps); }
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void SetTargetMetric (ScalarType tm ){targetMetric = tm; SetTerminationFlag(LOMetric); }
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void SetTimeBudget (float tb ){timeBudget = tb; SetTerminationFlag(LOTime); }
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void ClearTermination()
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{
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tf=0;
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nTargetSimplices=0;
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nTargetOps=0;
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targetMetric=0;
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timeBudget=0;
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nTargetVertices=0;
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}
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/// the mesh to optimize
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MeshType & m;
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///the heap of operations
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HeapType h;
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///the element of the heap
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// it is just a wrapper of the pointer to the localMod.
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// std heap does not work for
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// pointers and we want pointers to have heterogenous heaps.
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struct HeapElem
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{
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inline HeapElem(){locModPtr = NULL;}
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~HeapElem(){}
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///pointer to instance of local modifier
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LocModPtrType locModPtr;
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float pri;
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inline HeapElem( LocModPtrType _locModPtr)
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{
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locModPtr = _locModPtr;
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pri=float(locModPtr->Priority());
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};
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/// STL heap has the largest element as the first one.
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/// usually we mean priority as an error so we should invert the comparison
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inline const bool operator <(const HeapElem & h) const
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{
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return (pri > h.pri);
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//return (locModPtr->Priority() < h.locModPtr->Priority());
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}
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bool IsUpToDate()
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{
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return locModPtr->IsUpToDate();
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}
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};
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/// Default distructor
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~LocalOptimization(){
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typename HeapType::iterator i;
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for(i = h.begin(); i != h.end(); i++)
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delete (*i).locModPtr;
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};
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double e;
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/// main cycle of optimization
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bool DoOptimization()
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{
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start=clock();
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nPerfmormedOps =0;
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while( !GoalReached() && !h.empty())
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{
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if(h.size()> m.SimplexNumber()*HeapSimplexRatio ) ClearHeap();
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std::pop_heap(h.begin(),h.end());
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LocModPtrType locMod = h.back().locModPtr;
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currMetric=h.back().pri;
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h.pop_back();
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if( locMod->IsUpToDate() )
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{
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//printf("popped out: %s\n",locMod->Info(m));
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// check if it is feasible
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if (locMod->IsFeasible())
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{
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nPerfmormedOps++;
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locMod->Execute(m);
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locMod->UpdateHeap(h);
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}
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}
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//else printf("popped out unfeasible\n");
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delete locMod;
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}
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return !(h.empty());
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}
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// It removes from the heap all the operations that are no more 'uptodate'
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// (e.g. collapses that have some recently modified vertices)
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// This function is called from time to time by the doOptimization (e.g. when the heap is larger than fn*3)
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void ClearHeap()
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{
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typename HeapType::iterator hi;
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//int sz=h.size();
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for(hi=h.begin();hi!=h.end();)
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{
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if(!(*hi).locModPtr->IsUpToDate())
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{
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delete (*hi).locModPtr;
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*hi=h.back();
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if(&*hi==&h.back())
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{
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hi=h.end();
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h.pop_back();
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break;
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}
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h.pop_back();
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continue;
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}
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++hi;
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}
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//printf("\nReduced heap from %7i to %7i (fn %7i) ",sz,h.size(),m.fn);
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make_heap(h.begin(),h.end());
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}
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///initialize for all vertex the temporary mark must call only at the start of decimation
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///by default it takes the first element in the heap and calls Init (static funcion) of that type
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///of local modification.
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template <class LocalModificationType> void Init()
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{
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m.InitVertexIMark();
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LocalModificationType::Init(m,h);
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std::make_heap(h.begin(),h.end());
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if(!h.empty()) currMetric=h.front().pri;
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}
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template <class LocalModificationType> void Finalize()
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{
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LocalModificationType::Finalize(m,h);
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}
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/// say if the process is to end or not: the process ends when any of the termination conditions is verified
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/// override this function to implemetn other tests
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bool GoalReached(){
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assert ( ( ( tf & LOnSimplices )==0) || ( nTargetSimplices!= -1));
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assert ( ( ( tf & LOnVertices )==0) || ( nTargetVertices != -1));
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assert ( ( ( tf & LOnOps )==0) || ( nTargetOps != -1));
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assert ( ( ( tf & LOMetric )==0) || ( targetMetric != -1));
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assert ( ( ( tf & LOTime )==0) || ( timeBudget != -1));
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if ( IsTerminationFlag(LOnSimplices) && ( m.SimplexNumber()<= nTargetSimplices)) return true;
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if ( IsTerminationFlag(LOnVertices) && ( m.VertexNumber() <= nTargetVertices)) return true;
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if ( IsTerminationFlag(LOnOps) && (nPerfmormedOps == nTargetOps)) return true;
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if ( IsTerminationFlag(LOMetric) && ( currMetric > targetMetric)) return true;
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if ( IsTerminationFlag(LOTime) && ( (clock()-start)/(float)CLOCKS_PER_SEC > timeBudget)) return true;
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return false;
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}
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///erase from the heap the operations that are out of date
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void ClearHeapOld()
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{
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typename HeapType::iterator hi;
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for(hi=h.begin();hi!=h.end();++hi)
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if(!(*hi).locModPtr->IsUpToDate())
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{
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*hi=h.back();
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h.pop_back();
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if(hi==h.end()) break;
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}
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//printf("\nReduced heap from %i to %i",sz,h.size());
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make_heap(h.begin(),h.end());
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}
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};//end class decimation
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}//end namespace
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#endif
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