root/OpenSceneGraph/trunk/examples/osgpick/osgpick.cpp @ 13612

Revision 13574, 11.8 kB (checked in by robert, 5 hours ago)

Added debug setting of VolumeSettings? that is commented out

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1/* OpenSceneGraph example, osgpick.
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/* osgpick sample
20* demonstrate use of osgUtil/PickVisitor for picking in a HUD or
21* in a 3d scene,
22*/
23
24#include <osgUtil/Optimizer>
25#include <osgDB/ReadFile>
26#include <osgViewer/Viewer>
27#include <osgViewer/CompositeViewer>
28
29#include <osgGA/TerrainManipulator>
30#include <osgGA/StateSetManipulator>
31#include <osgGA/AnimationPathManipulator>
32#include <osgGA/TrackballManipulator>
33#include <osgGA/FlightManipulator>
34#include <osgGA/DriveManipulator>
35#include <osgGA/KeySwitchMatrixManipulator>
36#include <osgGA/StateSetManipulator>
37#include <osgGA/AnimationPathManipulator>
38#include <osgGA/TerrainManipulator>
39
40#include <osg/Material>
41#include <osg/Geode>
42#include <osg/BlendFunc>
43#include <osg/Depth>
44#include <osg/Projection>
45#include <osg/MatrixTransform>
46#include <osg/Camera>
47#include <osg/io_utils>
48#include <osg/ShapeDrawable>
49
50#include <osgText/Text>
51
52#include <sstream>
53
54// class to handle events with a pick
55class PickHandler : public osgGA::GUIEventHandler {
56public:
57
58    PickHandler(osgText::Text* updateText):
59        _updateText(updateText) {}
60
61    ~PickHandler() {}
62
63    bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa);
64
65    virtual void pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea);
66
67    void setLabel(const std::string& name)
68    {
69        if (_updateText.get()) _updateText->setText(name);
70    }
71
72protected:
73
74    osg::ref_ptr<osgText::Text>  _updateText;
75};
76
77bool PickHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
78{
79    switch(ea.getEventType())
80    {
81        case(osgGA::GUIEventAdapter::PUSH):
82        {
83            osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
84            if (view) pick(view,ea);
85            return false;
86        }
87        case(osgGA::GUIEventAdapter::KEYDOWN):
88        {
89            if (ea.getKey()=='c')
90            {
91                osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
92                osg::ref_ptr<osgGA::GUIEventAdapter> event = new osgGA::GUIEventAdapter(ea);
93                event->setX((ea.getXmin()+ea.getXmax())*0.5);
94                event->setY((ea.getYmin()+ea.getYmax())*0.5);
95                if (view) pick(view,*event);
96            }
97            return false;
98        }
99        default:
100            return false;
101    }
102}
103
104void PickHandler::pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea)
105{
106    osgUtil::LineSegmentIntersector::Intersections intersections;
107
108    std::string gdlist="";
109
110    if (view->computeIntersections(ea,intersections))
111    {
112        for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = intersections.begin();
113            hitr != intersections.end();
114            ++hitr)
115        {
116            std::ostringstream os;
117            if (!hitr->nodePath.empty() && !(hitr->nodePath.back()->getName().empty()))
118            {
119                // the geodes are identified by name.
120                os<<"Object \""<<hitr->nodePath.back()->getName()<<"\""<<std::endl;
121            }
122            else if (hitr->drawable.valid())
123            {
124                os<<"Object \""<<hitr->drawable->className()<<"\""<<std::endl;
125            }
126
127            os<<"        local coords vertex("<< hitr->getLocalIntersectPoint()<<")"<<"  normal("<<hitr->getLocalIntersectNormal()<<")"<<std::endl;
128            os<<"        world coords vertex("<< hitr->getWorldIntersectPoint()<<")"<<"  normal("<<hitr->getWorldIntersectNormal()<<")"<<std::endl;
129            const osgUtil::LineSegmentIntersector::Intersection::IndexList& vil = hitr->indexList;
130            for(unsigned int i=0;i<vil.size();++i)
131            {
132                os<<"        vertex indices ["<<i<<"] = "<<vil[i]<<std::endl;
133            }
134
135            gdlist += os.str();
136        }
137    }
138    setLabel(gdlist);
139}
140
141osg::Node* createHUD(osgText::Text* updateText)
142{
143
144    // create the hud. derived from osgHud.cpp
145    // adds a set of quads, each in a separate Geode - which can be picked individually
146    // eg to be used as a menuing/help system!
147    // Can pick texts too!
148
149    osg::Camera* hudCamera = new osg::Camera;
150    hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
151    hudCamera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);
152    hudCamera->setViewMatrix(osg::Matrix::identity());
153    hudCamera->setRenderOrder(osg::Camera::POST_RENDER);
154    hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);
155
156    std::string timesFont("fonts/times.ttf");
157
158    // turn lighting off for the text and disable depth test to ensure its always ontop.
159    osg::Vec3 position(150.0f,800.0f,0.0f);
160    osg::Vec3 delta(0.0f,-60.0f,0.0f);
161
162    {
163        osg::Geode* geode = new osg::Geode();
164        osg::StateSet* stateset = geode->getOrCreateStateSet();
165        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
166        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
167        geode->setName("simple");
168        hudCamera->addChild(geode);
169
170        osgText::Text* text = new  osgText::Text;
171        geode->addDrawable( text );
172
173        text->setFont(timesFont);
174        text->setText("Picking in Head Up Displays is simple!");
175        text->setPosition(position);
176
177        position += delta;
178    }
179
180
181    for (int i=0; i<5; i++) {
182        osg::Vec3 dy(0.0f,-30.0f,0.0f);
183        osg::Vec3 dx(120.0f,0.0f,0.0f);
184        osg::Geode* geode = new osg::Geode();
185        osg::StateSet* stateset = geode->getOrCreateStateSet();
186        const char *opts[]={"One", "Two", "Three", "January", "Feb", "2003"};
187        osg::Geometry *quad=new osg::Geometry;
188        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
189        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
190        std::string name="subOption";
191        name += " ";
192        name += std::string(opts[i]);
193        geode->setName(name);
194        osg::Vec3Array* vertices = new osg::Vec3Array(4); // 1 quad
195        osg::Vec4Array* colors = new osg::Vec4Array;
196        colors = new osg::Vec4Array;
197        colors->push_back(osg::Vec4(0.8-0.1*i,0.1*i,0.2*i, 1.0));
198        quad->setColorArray(colors, osg::Array::BIND_OVERALL);
199        (*vertices)[0]=position;
200        (*vertices)[1]=position+dx;
201        (*vertices)[2]=position+dx+dy;
202        (*vertices)[3]=position+dy;
203        quad->setVertexArray(vertices);
204        quad->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
205        geode->addDrawable(quad);
206        hudCamera->addChild(geode);
207
208        position += delta;
209    }
210
211
212
213    { // this displays what has been selected
214        osg::Geode* geode = new osg::Geode();
215        osg::StateSet* stateset = geode->getOrCreateStateSet();
216        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
217        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
218        geode->setName("The text label");
219        geode->addDrawable( updateText );
220        hudCamera->addChild(geode);
221
222        updateText->setCharacterSize(20.0f);
223        updateText->setFont(timesFont);
224        updateText->setColor(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
225        updateText->setText("");
226        updateText->setPosition(position);
227        updateText->setDataVariance(osg::Object::DYNAMIC);
228
229        position += delta;
230    }
231
232    return hudCamera;
233
234}
235
236int main( int argc, char **argv )
237{
238    // use an ArgumentParser object to manage the program arguments.
239    osg::ArgumentParser arguments(&argc,argv);
240
241    // read the scene from the list of file specified commandline args.
242    osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
243
244    if (!scene && arguments.read("--relative-camera-scene"))
245    {
246        // Create a test scene with a camera that has a relative reference frame.
247        osg::Group* group = new osg::Group();
248
249        osg::Geode* sphere = new osg::Geode();
250        sphere->setName("Sphere");
251        sphere->addDrawable(new osg::ShapeDrawable(new osg::Sphere()));
252
253        osg::Geode* cube = new osg::Geode();
254        cube->setName("Cube");
255        cube->addDrawable(new osg::ShapeDrawable(new osg::Box()));
256
257        osg::Camera* camera = new osg::Camera();
258        camera->setRenderOrder(osg::Camera::POST_RENDER);
259        camera->setClearMask(GL_DEPTH_BUFFER_BIT);
260        camera->setReferenceFrame(osg::Transform::RELATIVE_RF);
261        camera->setViewMatrix(osg::Matrix::translate(-2, 0, 0));
262
263        osg::MatrixTransform* xform = new osg::MatrixTransform(osg::Matrix::translate(1, 1, 1));
264        xform->addChild(camera);
265
266        group->addChild(sphere);
267        group->addChild(xform);
268        camera->addChild(cube);
269
270        scene = group;
271    }
272
273    // if not loaded assume no arguments passed in, try use default mode instead.
274    if (!scene) scene = osgDB::readNodeFile("fountain.osgt");
275
276    osg::ref_ptr<osg::Group> group = dynamic_cast<osg::Group*>(scene.get());
277    if (!group)
278    {
279        group = new osg::Group;
280        group->addChild(scene.get());
281    }
282
283    osg::ref_ptr<osgText::Text> updateText = new osgText::Text;
284
285    // add the HUD subgraph.
286    group->addChild(createHUD(updateText.get()));
287
288    if (arguments.read("--CompositeViewer"))
289    {
290        osg::ref_ptr<osgViewer::View> view = new osgViewer::View;
291        // add the handler for doing the picking
292        view->addEventHandler(new PickHandler(updateText.get()));
293
294        // set the scene to render
295        view->setSceneData(group.get());
296
297        view->setUpViewAcrossAllScreens();
298
299        osgViewer::CompositeViewer viewer;
300        viewer.addView(view.get());
301
302        return viewer.run();
303
304    }
305    else
306    {
307        osgViewer::Viewer viewer;
308
309
310        // add all the camera manipulators
311        {
312            osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
313
314            keyswitchManipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );
315            keyswitchManipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
316            keyswitchManipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );
317
318            unsigned int num = keyswitchManipulator->getNumMatrixManipulators();
319            keyswitchManipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );
320
321            std::string pathfile;
322            char keyForAnimationPath = '5';
323            while (arguments.read("-p",pathfile))
324            {
325                osgGA::AnimationPathManipulator* apm = new osgGA::AnimationPathManipulator(pathfile);
326                if (apm || !apm->valid())
327                {
328                    num = keyswitchManipulator->getNumMatrixManipulators();
329                    keyswitchManipulator->addMatrixManipulator( keyForAnimationPath, "Path", apm );
330                    ++keyForAnimationPath;
331                }
332            }
333
334            keyswitchManipulator->selectMatrixManipulator(num);
335
336            viewer.setCameraManipulator( keyswitchManipulator.get() );
337        }
338
339        // add the handler for doing the picking
340        viewer.addEventHandler(new PickHandler(updateText.get()));
341
342        // set the scene to render
343        viewer.setSceneData(group.get());
344
345        return viewer.run();
346    }
347
348}
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