1 /* OpenSceneGraph example, osgsimplifier.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
11 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
13 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
14 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
15 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
16 * THE SOFTWARE.
17 */
18
19 #include <osgDB/ReadFile>
20 #include <osgDB/WriteFile>
21
22 #include <osgUtil/Optimizer>
23 #include <osgUtil/Simplifier>
24
25 #include <osgViewer/Viewer>
26 #include <osgViewer/ViewerEventHandlers>
27
28 #include <osgGA/TrackballManipulator>
29 #include <osgGA/StateSetManipulator>
30
31 #include <iostream>
32
33 class KeyboardEventHandler : public osgGA::GUIEventHandler
34 {
35 public:
36
KeyboardEventHandler(unsigned int & flag,const std::string & filename)37 KeyboardEventHandler(unsigned int& flag, const std::string& filename) :
38 _flag(flag),
39 _outputFilename(filename)
40 {}
41
handle(const osgGA::GUIEventAdapter & ea,osgGA::GUIActionAdapter & aa)42 virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
43 {
44 switch(ea.getEventType())
45 {
46 case(osgGA::GUIEventAdapter::KEYDOWN):
47 {
48 if (ea.getKey()=='n')
49 {
50 _flag = 1;
51 return true;
52 }
53 if (ea.getKey()=='p')
54 {
55 _flag = 2;
56 return true;
57 }
58 if (ea.getKey()=='o')
59 {
60 osgViewer::View* view = dynamic_cast<osgViewer::Viewer*>(aa.asView());
61 osg::Node* sceneData = view ? view->getSceneData() : 0;
62 if (sceneData)
63 {
64 OSG_NOTICE<<"Witten model to file: "<<_outputFilename<<std::endl;
65 osgDB::writeNodeFile(*sceneData, _outputFilename);
66 }
67 return true;
68 }
69 break;
70 }
71 default:
72 break;
73 }
74 return false;
75 }
76
77 private:
78
79 unsigned int& _flag;
80 std::string _outputFilename;
81 };
82
83
main(int argc,char ** argv)84 int main( int argc, char **argv )
85 {
86
87 // use an ArgumentParser object to manage the program arguments.
88 osg::ArgumentParser arguments(&argc,argv);
89
90 // set up the usage document, in case we need to print out how to use this program.
91 arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
92 arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" examples illustrates simplification of triangle meshes.");
93 arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
94 arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
95 arguments.getApplicationUsage()->addCommandLineOption("--ratio <ratio>","Specify the sample ratio","0.5]");
96 arguments.getApplicationUsage()->addCommandLineOption("--max-error <error>","Specify the maximum error","4.0");
97
98
99 std::string outputFilename="model.osgt";
100
101 float sampleRatio = 0.5f;
102 float maxError = 4.0f;
103
104 // construct the viewer.
105 osgViewer::Viewer viewer;
106
107 // read the sample ratio if one is supplied
108 while (arguments.read("--ratio",sampleRatio)) {}
109 while (arguments.read("--max-error",maxError)) {}
110 while (arguments.read("-o",outputFilename)) {}
111
112 // if user request help write it out to cout.
113 if (arguments.read("-h") || arguments.read("--help"))
114 {
115 arguments.getApplicationUsage()->write(std::cout);
116 return 1;
117 }
118
119 if (arguments.argc()<=1)
120 {
121 arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
122 return 1;
123 }
124
125 // read the scene from the list of file specified commandline args.
126 osg::ref_ptr<osg::Node> loadedModel = osgDB::readRefNodeFiles(arguments);
127
128 // if not loaded assume no arguments passed in, try use default mode instead.
129 if (!loadedModel) loadedModel = osgDB::readRefNodeFile("dumptruck.osgt");
130
131 // if no model has been successfully loaded report failure.
132 if (!loadedModel)
133 {
134 std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
135 return 1;
136 }
137
138 //loadedModel->accept(simplifier);
139
140 unsigned int keyFlag = 0;
141 viewer.addEventHandler(new KeyboardEventHandler(keyFlag, outputFilename));
142
143 // add the state manipulator
144 viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
145
146 // add the window size toggle handler
147 viewer.addEventHandler(new osgViewer::WindowSizeHandler);
148
149 // add the stats handler
150 viewer.addEventHandler(new osgViewer::StatsHandler);
151
152 viewer.setCameraManipulator(new osgGA::TrackballManipulator());
153
154 // set the scene to render
155 viewer.setSceneData(loadedModel.get());
156
157 // create the windows and run the threads.
158 viewer.realize();
159
160 float multiplier = 0.8f;
161 float minRatio = 0.001f;
162 float ratio = sampleRatio;
163
164
165 while( !viewer.done() )
166 {
167 // fire off the cull and draw traversals of the scene.
168 viewer.frame();
169
170 if (keyFlag == 1 || keyFlag == 2)
171 {
172 if (keyFlag == 1) ratio *= multiplier;
173 if (keyFlag == 2) ratio /= multiplier;
174 if (ratio<minRatio) ratio=minRatio;
175
176 osgUtil::Simplifier simplifier(ratio, maxError);
177
178 std::cout<<"Running osgUtil::Simplifier with SampleRatio="<<ratio<<" maxError="<<maxError<<" ...";
179 std::cout.flush();
180
181 osg::ref_ptr<osg::Node> root = (osg::Node*)loadedModel->clone(osg::CopyOp::DEEP_COPY_ALL);
182
183 root->accept(simplifier);
184
185 std::cout<<"done"<<std::endl;
186
187 viewer.setSceneData(root.get());
188 keyFlag = 0;
189 }
190 }
191
192 return 0;
193 }
194
195