155 lines
4.7 KiB
C++
155 lines
4.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This application is open source and may be redistributed and/or modified
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* freely and without restriction, both in commericial and non commericial applications,
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* as long as this copyright notice is maintained.
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*
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* This application 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.
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*/
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#include <osgDB/ReadFile>
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#include <osgUtil/Optimizer>
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#include <osgUtil/Simplifier>
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#include <osgViewer/Viewer>
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#include <osgGA/TrackballManipulator>
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#include <iostream>
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class KeyboardEventHandler : public osgGA::GUIEventHandler
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{
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public:
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KeyboardEventHandler(unsigned int& flag) : _flag(flag)
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{}
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virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
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{
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switch(ea.getEventType())
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{
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case(osgGA::GUIEventAdapter::KEYDOWN):
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{
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if (ea.getKey()=='n')
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{
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_flag = 1;
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return true;
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}
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if (ea.getKey()=='p')
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{
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_flag = 2;
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return true;
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}
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break;
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}
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default:
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break;
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}
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return false;
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}
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private:
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unsigned int& _flag;
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};
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" examples illustrates simplification of triangle meshes.");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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arguments.getApplicationUsage()->addCommandLineOption("--ratio <ratio>","Specify the sample ratio","0.5]");
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arguments.getApplicationUsage()->addCommandLineOption("--max-error <error>","Specify the maximum error","4.0");
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float sampleRatio = 0.5f;
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float maxError = 4.0f;
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// construct the viewer.
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osgViewer::Viewer viewer;
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// read the sample ratio if one is supplied
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while (arguments.read("--ratio",sampleRatio)) {}
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while (arguments.read("--max-error",maxError)) {}
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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if (arguments.argc()<=1)
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{
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arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
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return 1;
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}
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// read the scene from the list of file specified commandline args.
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osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
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// if not loaded assume no arguments passed in, try use default mode instead.
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if (!loadedModel) loadedModel = osgDB::readNodeFile("dumptruck.osg");
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// if no model has been successfully loaded report failure.
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if (!loadedModel)
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{
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std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
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return 1;
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}
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//loadedModel->accept(simplifier);
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unsigned int keyFlag = 0;
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viewer.addEventHandler(new KeyboardEventHandler(keyFlag));
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// set the scene to render
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viewer.setSceneData(loadedModel.get());
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viewer.setCameraManipulator(new osgGA::TrackballManipulator());
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// create the windows and run the threads.
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viewer.realize();
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float multiplier = 0.8f;
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float minRatio = 0.001f;
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float ratio = sampleRatio;
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while( !viewer.done() )
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{
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// fire off the cull and draw traversals of the scene.
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viewer.frame();
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if (keyFlag == 1 || keyFlag == 2)
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{
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if (keyFlag == 1) ratio *= multiplier;
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if (keyFlag == 2) ratio /= multiplier;
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if (ratio<minRatio) ratio=minRatio;
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osgUtil::Simplifier simplifier(ratio, maxError);
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std::cout<<"Runing osgUtil::Simplifier with SampleRatio="<<ratio<<" maxError="<<maxError<<" ...";
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std::cout.flush();
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osg::ref_ptr<osg::Node> root = (osg::Node*)loadedModel->clone(osg::CopyOp::DEEP_COPY_ALL);
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root->accept(simplifier);
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std::cout<<"done"<<std::endl;
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viewer.setSceneData(root.get());
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keyFlag = 0;
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}
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}
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return 0;
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}
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