Added Geoff Michel's osgpick and osgUtil::PickVisitor code.

examples/osgcameragroup/osgcameragroup.cpp

@@ -147,7 +147,7 @@ int main( int argc, char **argv )
     cg.setSceneData(loadedModel.get());
 
     Producer::Trackball tb;
-    tb.setOrientation( Producer::Trackball::Y_UP );
+    tb.setOrientation( Producer::Trackball::Z_UP );
 
     // create the windows and run the threads.
     cg.realize();
@@ -156,7 +156,7 @@ int main( int argc, char **argv )
 
     while( !kbmcb.done() )
     {
-        // syncronize to screen refresh.
+        // syncronize to the when cull and draw threads have completed.
         cg.sync();
 
         // update the scene by traversing it with the the update visitor which will
@@ -171,6 +171,10 @@ int main( int argc, char **argv )
         // fire off the cull and draw traversals of the scene.
         cg.frame();
     }
+
+    // syncronize to the when cull and draw threads have completed.
+    cg.sync();
+
     return 0;
 }
 

examples/osgpick/GNUmakefile

@@ -0,0 +1,19 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs 
+
+CXXFILES =\
+	osgpick.cpp\
+
+LIBS     += -losgProducer -lProducer -losgText -losgGA -losgDB -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+INSTFILES = \
+	$(CXXFILES)\
+	GNUmakefile.inst=GNUmakefile
+
+EXEC = osgpick
+
+INC += $(PRODUCER_INCLUDE_DIR) 
+LDFLAGS  += $(PRODUCER_LIB_DIR)
+
+include $(TOPDIR)/Make/makerules 
+

examples/osgpick/GNUmakefile.inst

@@ -0,0 +1,14 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs
+
+CXXFILES =\
+	osgpick.cpp\
+
+LIBS     += -losgProducer -lProducer -losgDB -losgText -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+EXEC = osgpick
+
+INC += $(PRODUCER_INCLUDE_DIR)
+LDFLAGS  += $(PRODUCER_LIB_DIR)
+
+include $(TOPDIR)/Make/makerules

examples/osgpick/osgpick.cpp

@@ -0,0 +1,289 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+/* osgpick sample
+* demonstrate use of osgUtil/PickVisitor for picking in a HUD or
+* in a 3d scene,
+*/
+
+#include <osgUtil/Optimizer>
+#include <osgDB/ReadFile>
+#include <osgProducer/Viewer>
+
+#include <osg/Material>
+#include <osg/Geode>
+#include <osg/BlendFunc>
+#include <osg/Depth>
+#include <osg/Projection>
+#include <osg/MatrixTransform>
+
+#include <osgText/Text>
+
+#include <osgUtil/PickVisitor>
+
+
+
+// class to handle events with a pick
+class PickHandler : public osgGA::GUIEventHandler {
+public: 
+
+    PickHandler(osgProducer::OsgCameraGroup* cg,osgText::Text* updateText):
+        _cg(cg),
+        _updateText(updateText) {}
+        
+    ~PickHandler() {}
+    
+    bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& us);
+
+    virtual void pick(const osgGA::GUIEventAdapter& ea);
+
+    void setLabel(const std::string& name)
+    {
+        if (_updateText.get()) _updateText->setText(name);
+    }
+    
+protected:
+
+    osgProducer::OsgCameraGroup *_cg;
+    osg::ref_ptr<osgText::Text>  _updateText;
+};
+
+bool PickHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
+{
+    switch(ea.getEventType())
+    {
+    case(osgGA::GUIEventAdapter::FRAME):
+        {
+            pick(ea);
+        }
+        return false;
+        
+    default:
+        return false;
+    }
+}
+
+void PickHandler::pick(const osgGA::GUIEventAdapter& ea)
+{
+    // OK here is the interesting bit - How To Pick a Geode
+    // including geodes in a HUD under a Projection Matrix
+    osg::Node *scene=_cg->getSceneData();//main node of the scene.
+    if (scene)
+    {
+        float x=ea.getXnormalized();
+        float y=ea.getYnormalized();
+        osgUtil::PickVisitor iv;
+        const float *matView;
+        const float *matProj;
+        Producer::Camera *cmm=_cg->getCamera(0);
+        matView=cmm->getViewMatrix(); 
+        matProj=cmm->getProjectionMatrix();
+        osg::Matrix vum;
+        vum.set(matView);
+        vum.postMult(osg::Matrix(matProj));
+        osg::Matrix windowmatrix=osg::Matrix::translate(1.0f,1.0f,1.0f)*
+            osg::Matrix::scale(0.5f,0.5f,0.5f);
+        vum.postMult(windowmatrix);
+        osgUtil::IntersectVisitor::HitList& hlist=iv.getHits(scene, vum, x,y);
+        std::string gdlist="";
+        if (iv.hits())
+        {
+            for(osgUtil::IntersectVisitor::HitList::iterator hitr=hlist.begin();
+            hitr!=hlist.end();
+            ++hitr)
+            {
+                //osg::Vec3 ip = hitr->getLocalIntersectPoint();
+                //osg::Vec3 in = hitr->getLocalIntersectNormal();
+                osg::Geode* geode = hitr->_geode.get();
+                // the geodes are identified by name.
+                if (geode) {
+                    gdlist=gdlist+" "+geode->getName();
+                } 
+            }
+        }
+        setLabel(gdlist);
+    }
+}
+
+osg::Node* createHUD(osgText::Text* updateText)
+{    // create the hud. derived from osgHud.cpp
+    // adds a set of quads, each in a separate Geode - which can be picked individually
+    // eg to be used as a menuing/help system!
+    // Can pick texts too!
+    osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
+    modelview_abs->setReferenceFrame(osg::Transform::RELATIVE_TO_ABSOLUTE);
+    modelview_abs->setMatrix(osg::Matrix::identity());
+    
+    osg::Projection* projection = new osg::Projection;
+    projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
+    projection->addChild(modelview_abs);
+    
+    
+    std::string timesFont("fonts/times.ttf");
+    
+    // turn lighting off for the text and disable depth test to ensure its always ontop.
+    osg::Vec3 position(150.0f,800.0f,0.0f);
+    osg::Vec3 delta(0.0f,-60.0f,0.0f);
+    
+    {
+        osg::Geode* geode = new osg::Geode();
+        osg::StateSet* stateset = geode->getOrCreateStateSet();
+        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
+        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
+        geode->setName("simple");
+        modelview_abs->addChild(geode);
+        
+        osgText::Text* text = new  osgText::Text;
+        geode->addDrawable( text );
+        
+        text->setFont(timesFont);
+        text->setText("Picking in Head Up Displays is simple !=]");
+        text->setPosition(position);
+        
+        position += delta;
+    }    
+    
+    
+    for (int i=0; i<5; i++) {
+        osg::Vec3 dy(0.0f,-30.0f,0.0f);
+        osg::Vec3 dx(120.0f,0.0f,0.0f);
+        osg::Geode* geode = new osg::Geode();
+        osg::StateSet* stateset = geode->getOrCreateStateSet();
+        const char *opts[]={"One", "Two", "Three", "January", "Feb", "2003"};
+        osg::Geometry *quad=new osg::Geometry;
+        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
+        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
+        std::string name="subOption";
+        name += " ";
+        name += std::string(opts[i]);
+        geode->setName(name);
+        osg::Vec3Array* vertices = new osg::Vec3Array(4); // 1 quad
+        osg::Vec4Array* colors = new osg::Vec4Array;
+        colors = new osg::Vec4Array;
+        colors->push_back(osg::Vec4(0.8-0.1*i,0.1*i,0.2*i, 1.0));
+        quad->setColorArray(colors);
+        quad->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE);
+        (*vertices)[0]=position;
+        (*vertices)[1]=position+dx;
+        (*vertices)[2]=position+dx+dy;
+        (*vertices)[3]=position+dy;
+        quad->setVertexArray(vertices);
+        quad->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
+        geode->addDrawable(quad);
+        modelview_abs->addChild(geode);
+        
+        position += delta;
+    }    
+    
+    
+    
+    { // this displays what has been selected
+        osg::Geode* geode = new osg::Geode();
+        osg::StateSet* stateset = geode->getOrCreateStateSet();
+        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
+        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
+        geode->setName("whatis");
+        geode->addDrawable( updateText );
+        modelview_abs->addChild(geode);
+        
+        updateText->setFont(timesFont);
+        updateText->setText("whatis will tell you what is under the mouse");
+        updateText->setPosition(position);
+        
+        position += delta;
+    }    
+    
+    return projection;
+
+}
+
+int main( int argc, char **argv )
+{
+
+    // use an ArgumentParser object to manage the program arguments.
+    osg::ArgumentParser arguments(&argc,argv);
+    
+    // set up the usage document, in case we need to print out how to use this program.
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates how to do Head Up Displays.");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] [filename] ...");
+    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
+    
+
+    // construct the viewer.
+    osgProducer::Viewer viewer(arguments);
+
+    // set up the value with sensible default event handlers.
+    viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
+
+    // get details on keyboard and mouse bindings used by the viewer.
+    viewer.getUsage(*arguments.getApplicationUsage());
+
+    // if user request help write it out to cout.
+    if (arguments.read("-h") || arguments.read("--help"))
+    {
+        arguments.getApplicationUsage()->write(std::cout);
+        return 1;
+    }
+
+    // any option left unread are converted into errors to write out later.
+    arguments.reportRemainingOptionsAsUnrecognized();
+
+    // report any errors if they have occured when parsing the program aguments.
+    if (arguments.errors())
+    {
+        arguments.writeErrorMessages(std::cout);
+        return 1;
+    }
+    
+    // read the scene from the list of file specified commandline args.
+    osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
+
+    osg::ref_ptr<osg::Group> group = dynamic_cast<osg::Group*>(scene.get());
+    if (!group)
+    {
+        group = new osg::Group;
+        group->addChild(scene.get());
+    }
+
+    osg::ref_ptr<osgText::Text> updateText = new osgText::Text;
+
+    // add the HUD subgraph.    
+    group->addChild(createHUD(updateText.get()));
+
+    // add the handler for doing the picking
+    viewer.getEventHandlerList().push_front(new PickHandler(&viewer,updateText.get()));
+
+    // set the scene to render
+    viewer.setSceneData(group.get());
+
+    // create the windows and run the threads.
+    viewer.realize();
+
+    while( !viewer.done() )
+    {
+        // wait for all cull and draw threads to complete.
+        viewer.sync();
+
+        // update the scene by traversing it with the the update visitor which will
+        // call all node update callbacks and animations.
+        viewer.update();
+         
+        // fire off the cull and draw traversals of the scene.
+        viewer.frame();
+        
+    }
+    
+    // wait for all cull and draw threads to complete before exit.
+    viewer.sync();
+    
+    return 0;
+}