root/OpenSceneGraph/trunk/include/osgUtil/Simplifier @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSGUTIL_SIMPLIFIER
15#define OSGUTIL_SIMPLIFIER 1
16
17#include <osg/NodeVisitor>
18#include <osg/Geode>
19#include <osg/Geometry>
20
21#include <osgUtil/Export>
22
23namespace osgUtil {
24
25/** A simplifier for reducing the number of traingles in osg::Geometry.
26  */
27class OSGUTIL_EXPORT Simplifier : public osg::NodeVisitor
28{
29    public:
30
31        Simplifier(double sampleRatio=1.0, double maximumError=FLT_MAX, double maximumLength=0.0);
32
33        META_NodeVisitor("osgUtil","Simplifier")
34
35        void setSampleRatio(float sampleRatio) { _sampleRatio = sampleRatio; }
36        float getSampleRatio() const { return _sampleRatio; }
37
38        /** Set the maximum point error that all point removals must be less than to permit removal of a point.
39          * Note, Only used when down sampling. i.e. sampleRatio < 1.0*/
40        void setMaximumError(float error) { _maximumError = error; }
41        float getMaximumError() const { return _maximumError; }
42
43        /** Set the maximum length target that all edges must be shorted than.
44          * Note, Only used when up sampling i.e. sampleRatio > 1.0.*/
45        void setMaximumLength(float length) { _maximumLength = length; }
46        float getMaximumLength() const { return _maximumLength; }
47
48        void setDoTriStrip(bool on) { _triStrip = on; }
49        bool getDoTriStrip() const { return _triStrip; }
50
51        void setSmoothing(bool on) { _smoothing = on; }
52        bool getSmoothing() const { return _smoothing; }
53
54        class ContinueSimplificationCallback : public osg::Referenced
55        {
56            public:
57                /** return true if mesh should be continued to be simplified, return false to stop simplification.*/
58                virtual bool continueSimplification(const Simplifier& simplifier, float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
59                {
60                    return simplifier.continueSimplificationImplementation(nextError, numOriginalPrimitives, numRemainingPrimitives);
61                }
62
63            protected:
64                virtual ~ContinueSimplificationCallback() {}
65        };
66
67        void setContinueSimplificationCallback(ContinueSimplificationCallback* cb) { _continueSimplificationCallback = cb; }
68        ContinueSimplificationCallback* getContinueSimplificationCallback() { return _continueSimplificationCallback.get(); }
69        const ContinueSimplificationCallback* getContinueSimplificationCallback() const { return _continueSimplificationCallback.get(); }
70
71
72        bool continueSimplification(float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
73        {
74            if (_continueSimplificationCallback.valid()) return _continueSimplificationCallback->continueSimplification(*this, nextError, numOriginalPrimitives, numRemainingPrimitives);
75            else return continueSimplificationImplementation(nextError, numOriginalPrimitives, numRemainingPrimitives);
76        }
77
78        virtual bool continueSimplificationImplementation(float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
79        {
80            if (getSampleRatio()<1.0) return ((float)numRemainingPrimitives > ((float)numOriginalPrimitives) * getSampleRatio()) && nextError<=getMaximumError();
81            else return ((float)numRemainingPrimitives < ((float)numOriginalPrimitives) * getSampleRatio()) && nextError>getMaximumLength();
82        }
83
84
85        virtual void apply(osg::Geode& geode)
86        {
87            for(unsigned int i=0;i<geode.getNumDrawables();++i)
88            {
89                osg::Geometry* geometry = geode.getDrawable(i)->asGeometry();
90                if (geometry)
91                {
92                    simplify(*geometry);
93                }
94            }
95        }
96
97        /** simply the geometry.*/
98        void simplify(osg::Geometry& geometry);
99
100        typedef std::vector<unsigned int> IndexList; /// a list of point indices
101
102        /** simply the geometry, whilst protecting key points from being modified.*/
103        void simplify(osg::Geometry& geometry, const IndexList& protectedPoints);
104
105
106    protected:
107
108        double _sampleRatio;
109        double _maximumError;
110        double _maximumLength;
111        bool  _triStrip;
112        bool  _smoothing;
113
114        osg::ref_ptr<ContinueSimplificationCallback> _continueSimplificationCallback;
115
116};
117
118
119}
120
121#endif
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