105 lines
4.0 KiB
C++
105 lines
4.0 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGUTIL_SIMPLIFIER
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#define OSGUTIL_SIMPLIFIER 1
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#include <osg/NodeVisitor>
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#include <osg/Geode>
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#include <osg/Geometry>
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#include <osgUtil/Export>
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namespace osgUtil {
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/** A simplifier for reducing the number of traingles in osg::Geometry.
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*/
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class OSGUTIL_EXPORT Simplifier : public osg::NodeVisitor
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{
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public:
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Simplifier(float sampleRatio=1.0f, float maximumError=0.0f);
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void setSampleRatio(float sampleRatio) { _sampleRatio = sampleRatio; }
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float getSampleRatio() const { return _sampleRatio; }
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void setMaximumError(float error) { _maximumError = error; }
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float getMaximumError() const { return _maximumError; }
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class ContinueSimplificationCallback : public osg::Referenced
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{
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public:
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/** return true if mesh should be continued to be simplified, return false to stop simplification.*/
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virtual bool continueSimplification(const Simplifier& simplifier, float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
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{
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return simplifier.continueSimplificationImplementation(nextError, numOriginalPrimitives, numRemainingPrimitives);
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}
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protected:
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virtual ~ContinueSimplificationCallback() {}
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};
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void setContinueSimplificationCallback(ContinueSimplificationCallback* cb) { _continueSimplificationCallback = cb; }
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ContinueSimplificationCallback* getContinueSimplificationCallback() { return _continueSimplificationCallback.get(); }
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const ContinueSimplificationCallback* getContinueSimplificationCallback() const { return _continueSimplificationCallback.get(); }
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bool continueSimplification(float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
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{
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if (_continueSimplificationCallback.valid()) return _continueSimplificationCallback->continueSimplification(*this, nextError, numOriginalPrimitives, numRemainingPrimitives);
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else return continueSimplificationImplementation(nextError, numOriginalPrimitives, numRemainingPrimitives);
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}
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virtual bool continueSimplificationImplementation(float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
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{
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if (nextError<=getMaximumError()) return true;
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return (float)numRemainingPrimitives > (float)numOriginalPrimitives * getSampleRatio();
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}
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virtual void apply(osg::Geode& geode)
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{
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for(unsigned int i=0;i<geode.getNumDrawables();++i)
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{
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osg::Geometry* geometry = geode.getDrawable(i)->asGeometry();
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if (geometry)
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{
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simplify(*geometry);
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}
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}
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}
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/** simply the geometry.*/
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void simplify(osg::Geometry& geometry);
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typedef std::vector<unsigned int> IndexList; /// a list of point indices
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/** simply the geometry, whilst protecting key points from being modified.*/
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void simplify(osg::Geometry& geometry, const IndexList& protectedPoints);
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protected:
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float _sampleRatio;
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float _maximumError;
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osg::ref_ptr<ContinueSimplificationCallback> _continueSimplificationCallback;
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};
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}
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#endif
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