Changeset 7875 for OpenSceneGraph/trunk/examples/osgtext/osgtext.cpp

Timestamp:

02/25/08 14:07:37 (5 years ago)

Author:

robert

Message:

Reverted back to previous version of osgtext

Files:

• OpenSceneGraph/trunk/examples/osgtext/osgtext.cpp (modified) (4 diffs)

OpenSceneGraph/trunk/examples/osgtext/osgtext.cpp

@@ -37 +37 @@
 
 
-
-
-
-
+osg::Group* createHUDText()
+{
+
+    osg::Group* rootNode = new osg::Group;
+
+    osgText::Font* font = osgText::readFontFile("fonts/arial.ttf");
+
+    osg::Geode* geode  = new osg::Geode;
+    rootNode->addChild(geode);
+
+    float windowHeight = 1024.0f;
+    float windowWidth = 1280.0f;
+    float margin = 50.0f;
+
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////
+//    
+// Examples of how to set up different text layout
+//
+
+    osg::Vec4 layoutColor(1.0f,1.0f,0.0f,1.0f);
+    float layoutCharacterSize = 20.0f;    
+    
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(layoutColor);
+        text->setCharacterSize(layoutCharacterSize);
+        text->setPosition(osg::Vec3(margin,windowHeight-margin,0.0f));
+
+        // the default layout is left to right, typically used in languages
+        // originating from europe such as English, French, German, Spanish etc..
+        text->setLayout(osgText::Text::LEFT_TO_RIGHT);
+
+        text->setText("text->setLayout(osgText::Text::LEFT_TO_RIGHT);");
+        geode->addDrawable(text);
+    }
+
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(layoutColor);
+        text->setCharacterSize(layoutCharacterSize);
+        text->setPosition(osg::Vec3(windowWidth-margin,windowHeight-margin,0.0f));
+
+        // right to left layouts would be used for hebrew or arabic fonts.
+        text->setLayout(osgText::Text::RIGHT_TO_LEFT);
+        text->setAlignment(osgText::Text::RIGHT_BASE_LINE);
+
+        text->setText("text->setLayout(osgText::Text::RIGHT_TO_LEFT);");
+        geode->addDrawable(text);
+    }
+
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(layoutColor);
+        text->setPosition(osg::Vec3(margin,windowHeight-margin,0.0f));
+        text->setCharacterSize(layoutCharacterSize);
+
+        // vertical font layout would be used for asian fonts.
+        text->setLayout(osgText::Text::VERTICAL);
+
+        text->setText("text->setLayout(osgText::Text::VERTICAL);");
+        geode->addDrawable(text);
+    }
+    
+    
+////////////////////////////////////////////////////////////////////////////////////////////////////////
+//    
+// Examples of how to set up different font resolution
+//
+
+    osg::Vec4 fontSizeColor(0.0f,1.0f,1.0f,1.0f);
+    float fontSizeCharacterSize = 30;
+    
+    osg::Vec3 cursor = osg::Vec3(margin*2,windowHeight-margin*2,0.0f);
+    
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(fontSizeColor);
+        text->setCharacterSize(fontSizeCharacterSize);
+        text->setPosition(cursor);
+        
+        // use text that uses 10 by 10 texels as a target resolution for fonts.
+        text->setFontResolution(10,10); // blocky but small texture memory usage
+        
+        text->setText("text->setFontResolution(10,10); // blocky but small texture memory usage");
+        geode->addDrawable(text);
+    }
+    
+    cursor.y() -= fontSizeCharacterSize;
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(fontSizeColor);
+        text->setCharacterSize(fontSizeCharacterSize);
+        text->setPosition(cursor);
+        
+        // use text that uses 20 by 20 texels as a target resolution for fonts.
+        text->setFontResolution(20,20); // smoother but higher texture memory usage (but still quite low).
+        
+        text->setText("text->setFontResolution(20,20); // smoother but higher texture memory usage (but still quite low).");
+        geode->addDrawable(text);
+    }
+    
+    cursor.y() -= fontSizeCharacterSize;
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(fontSizeColor);
+        text->setCharacterSize(fontSizeCharacterSize);
+        text->setPosition(cursor);
+        
+        // use text that uses 40 by 40 texels as a target resolution for fonts.
+        text->setFontResolution(40,40); // even smoother but again higher texture memory usage.
+        
+        text->setText("text->setFontResolution(40,40); // even smoother but again higher texture memory usage.");
+        geode->addDrawable(text);
+    }
+
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////
+//    
+// Examples of how to set up different sized text
+//
+
+    osg::Vec4 characterSizeColor(1.0f,0.0f,1.0f,1.0f);
+    
+    cursor.y() -= fontSizeCharacterSize*2.0f;
+    
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(characterSizeColor);
+        text->setFontResolution(20,20);
+        text->setPosition(cursor);
+        
+        // use text that is 20 units high.
+        text->setCharacterSize(20); // small
+        
+        text->setText("text->setCharacterSize(20.0f); // small");
+        geode->addDrawable(text);
+    }
+    
+    cursor.y() -= 30.0f;
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(characterSizeColor);
+        text->setFontResolution(30,30);
+        text->setPosition(cursor);
+        
+        // use text that is 30 units high.
+        text->setCharacterSize(30.0f); // medium
+        
+        text->setText("text->setCharacterSize(30.0f); // medium");
+        geode->addDrawable(text);
+    }
+    
+    cursor.y() -= 50.0f;
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setFont(font);
+        text->setColor(characterSizeColor);
+        text->setFontResolution(40,40);
+        text->setPosition(cursor);
+        
+        // use text that is 60 units high.
+        text->setCharacterSize(60.0f); // large
+        
+        text->setText("text->setCharacterSize(60.0f); // large");
+        geode->addDrawable(text);
+    }
+
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////
+//    
+// Examples of how to set up different alignments
+//
+
+    osg::Vec4 alignmentSizeColor(0.0f,1.0f,0.0f,1.0f);
+    float alignmentCharacterSize = 25.0f;
+    cursor.x() = 640;
+    cursor.y() = margin*4.0f;
+    
+    typedef std::pair<osgText::Text::AlignmentType,std::string> AlignmentPair;
+    typedef std::vector<AlignmentPair> AlignmentList;
+    AlignmentList alignmentList;
+    alignmentList.push_back(AlignmentPair(osgText::Text::LEFT_TOP,"text->setAlignment(\nosgText::Text::LEFT_TOP);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::LEFT_CENTER,"text->setAlignment(\nosgText::Text::LEFT_CENTER);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::LEFT_BOTTOM,"text->setAlignment(\nosgText::Text::LEFT_BOTTOM);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::CENTER_TOP,"text->setAlignment(\nosgText::Text::CENTER_TOP);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::CENTER_CENTER,"text->setAlignment(\nosgText::Text::CENTER_CENTER);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::CENTER_BOTTOM,"text->setAlignment(\nosgText::Text::CENTER_BOTTOM);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::RIGHT_TOP,"text->setAlignment(\nosgText::Text::RIGHT_TOP);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::RIGHT_CENTER,"text->setAlignment(\nosgText::Text::RIGHT_CENTER);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::RIGHT_BOTTOM,"text->setAlignment(\nosgText::Text::RIGHT_BOTTOM);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::LEFT_BASE_LINE,"text->setAlignment(\nosgText::Text::LEFT_BASE_LINE);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::CENTER_BASE_LINE,"text->setAlignment(\nosgText::Text::CENTER_BASE_LINE);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::RIGHT_BASE_LINE,"text->setAlignment(\nosgText::Text::RIGHT_BASE_LINE);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::LEFT_BOTTOM_BASE_LINE,"text->setAlignment(\nosgText::Text::LEFT_BOTTOM_BASE_LINE);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::CENTER_BOTTOM_BASE_LINE,"text->setAlignment(\nosgText::Text::CENTER_BOTTOM_BASE_LINE);"));
+    alignmentList.push_back(AlignmentPair(osgText::Text::RIGHT_BOTTOM_BASE_LINE,"text->setAlignment(\nosgText::Text::RIGHT_BOTTOM_BASE_LINE);"));
+
+
+    osg::Sequence* sequence = new osg::Sequence;
+    {
+        for(AlignmentList::iterator itr=alignmentList.begin();
+            itr!=alignmentList.end();
+            ++itr)
+        {
+            osg::Geode* alignmentGeode = new osg::Geode;
+            sequence->addChild(alignmentGeode);
+            sequence->setTime(sequence->getNumChildren(), 1.0f);
+
+            osgText::Text* text = new osgText::Text;
+            text->setFont(font);
+            text->setColor(alignmentSizeColor);
+            text->setCharacterSize(alignmentCharacterSize);
+            text->setPosition(cursor);
+            text->setDrawMode(osgText::Text::TEXT|osgText::Text::ALIGNMENT|osgText::Text::BOUNDINGBOX);
+            
+            text->setAlignment(itr->first);
+            text->setText(itr->second);
+            
+            alignmentGeode->addDrawable(text);
+
+
+        }
+        
+    }
+
+    sequence->setMode(osg::Sequence::START);
+    sequence->setInterval(osg::Sequence::LOOP, 0, -1);
+    sequence->setDuration(1.0f, -1);
+    
+    rootNode->addChild(sequence);
+
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////
+//    
+// Examples of how to set up different fonts...
+//
+
+    cursor.x() = margin*2.0f;
+    cursor.y() = margin*2.0f;
+    
+    osg::Vec4 fontColor(1.0f,0.5f,0.0f,1.0f);
+    float fontCharacterSize = 20.0f;
+    float spacing = 40.0f;
+    
+    {
+        osgText::Text* text = new osgText::Text;
+        text->setColor(fontColor);
+        text->setPosition(cursor);
+        text->setCharacterSize(fontCharacterSize);
+        
+        text->setFont(0);
+        text->setText("text->setFont(0); // inbuilt font.");
+        geode->addDrawable(text);
+
+        cursor.x() = text->getBound().xMax() + spacing ;
+    }
+    
+    {
+        osgText::Font* arial = osgText::readFontFile("fonts/arial.ttf");
+
+        osgText::Text* text = new osgText::Text;
+        text->setColor(fontColor);
+        text->setPosition(cursor);
+        text->setCharacterSize(fontCharacterSize);
+        
+        text->setFont(arial);
+        text->setText(arial!=0?
+                      "text->setFont(\"fonts/arial.ttf\");":
+                      "unable to load \"fonts/arial.ttf\"");
+        geode->addDrawable(text);
+
+        cursor.x() = text->getBound().xMax() + spacing ;
+    }
+    
+    {
+        osgText::Font* times = osgText::readFontFile("fonts/times.ttf");
+
+        osgText::Text* text = new osgText::Text;
+        text->setColor(fontColor);
+        text->setPosition(cursor);
+        text->setCharacterSize(fontCharacterSize);
+        
+        geode->addDrawable(text);
+        text->setFont(times);
+        text->setText(times!=0?
+                      "text->setFont(\"fonts/times.ttf\");":
+                      "unable to load \"fonts/times.ttf\"");
+
+        cursor.x() = text->getBound().xMax() + spacing ;
+    }
+    
+    cursor.x() = margin*2.0f;
+    cursor.y() = margin;
+
+    {
+        osgText::Font* dirtydoz = osgText::readFontFile("fonts/dirtydoz.ttf");
+
+        osgText::Text* text = new osgText::Text;
+        text->setColor(fontColor);
+        text->setPosition(cursor);
+        text->setCharacterSize(fontCharacterSize);
+        
+        text->setFont(dirtydoz);
+        text->setText(dirtydoz!=0?
+                      "text->setFont(\"fonts/dirtydoz.ttf\");":
+                      "unable to load \"fonts/dirtydoz.ttf\"");
+        geode->addDrawable(text);
+
+        cursor.x() = text->getBound().xMax() + spacing ;
+    }
+    
+    {
+        osgText::Font* fudd = osgText::readFontFile("fonts/fudd.ttf");
+    
+        osgText::Text* text = new osgText::Text;
+        text->setColor(fontColor);
+        text->setPosition(cursor);
+        text->setCharacterSize(fontCharacterSize);
+        
+        text->setFont(fudd);
+        text->setText(fudd!=0?
+                      "text->setFont(\"fonts/fudd.ttf\");":
+                      "unable to load \"fonts/fudd.ttf\"");
+        geode->addDrawable(text);
+
+        cursor.x() = text->getBound().xMax() + spacing ;
+    }
+            
+    return rootNode;    
+}
+
+
+
+
+// create text which sits in 3D space such as would be inserted into a normal model
+osg::Group* create3DText(const osg::Vec3& center,float radius)
+{
+
+    osg::Geode* geode  = new osg::Geode;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////
+//    
+// Examples of how to set up axis/orientation alignments
+//
+
+    float characterSize=radius*0.2f;
+    
+    osg::Vec3 pos(center.x()-radius*.5f,center.y()-radius*.5f,center.z()-radius*.5f);
+
+    osgText::Text* text1 = new osgText::Text;
+    text1->setFont("fonts/times.ttf");
+    text1->setCharacterSize(characterSize);
+    text1->setPosition(pos);
+    text1->setAxisAlignment(osgText::Text::XY_PLANE);
+    text1->setText("XY_PLANE");
+    geode->addDrawable(text1);
+
+    osgText::Text* text2 = new osgText::Text;
+    text2->setFont("fonts/times.ttf");
+    text2->setCharacterSize(characterSize);
+    text2->setPosition(pos);
+    text2->setAxisAlignment(osgText::Text::YZ_PLANE);
+    text2->setText("YZ_PLANE");
+    geode->addDrawable(text2);
+
+    osgText::Text* text3 = new osgText::Text;
+    text3->setFont("fonts/times.ttf");
+    text3->setCharacterSize(characterSize);
+    text3->setPosition(pos);
+    text3->setAxisAlignment(osgText::Text::XZ_PLANE);
+    text3->setText("XZ_PLANE");
+    geode->addDrawable(text3);
+
+
+    osgText::Text* text4 = new osgText::Text;
+    text4->setFont("fonts/times.ttf");
+    text4->setCharacterSize(characterSize);
+    text4->setPosition(center);
+    text4->setAxisAlignment(osgText::Text::SCREEN);
+
+    osg::Vec4 characterSizeModeColor(1.0f,0.0f,0.5f,1.0f);
+
+    osgText::Text* text5 = new osgText::Text;
+    text5->setColor(characterSizeModeColor);
+    text5->setFont("fonts/times.ttf");
+    //text5->setCharacterSize(characterSize);
+    text5->setCharacterSize(32.0f); // medium
+    text5->setPosition(center - osg::Vec3(0.0, 0.0, 0.2));
+    text5->setAxisAlignment(osgText::Text::SCREEN);
+    text5->setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
+    text5->setText("CharacterSizeMode SCREEN_COORDS(size 32.0)");
+    geode->addDrawable(text5);
+
+    osgText::Text* text6 = new osgText::Text;
+    text6->setColor(characterSizeModeColor);
+    text6->setFont("fonts/times.ttf");
+    text6->setCharacterSize(characterSize);
+    text6->setPosition(center - osg::Vec3(0.0, 0.0, 0.4));
+    text6->setAxisAlignment(osgText::Text::SCREEN);
+    text6->setCharacterSizeMode(osgText::Text::OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT);
+    text6->setText("CharacterSizeMode OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT");
+    geode->addDrawable(text6);
+
+    osgText::Text* text7 = new osgText::Text;
+    text7->setColor(characterSizeModeColor);
+    text7->setFont("fonts/times.ttf");
+    text7->setCharacterSize(characterSize);
+    text7->setPosition(center - osg::Vec3(0.0, 0.0, 0.6));
+    text7->setAxisAlignment(osgText::Text::SCREEN);
+    text7->setCharacterSizeMode(osgText::Text::OBJECT_COORDS);
+    text7->setText("CharacterSizeMode OBJECT_COORDS (default)");
+    geode->addDrawable(text7);
+
+#if 1
+    // reproduce outline bounding box compute problem with backdrop on.
+    text4->setBackdropType(osgText::Text::OUTLINE);
+    text4->setDrawMode(osgText::Text::TEXT | osgText::Text::BOUNDINGBOX);
+#endif
+
+    text4->setText("SCREEN");
+    geode->addDrawable(text4);
+
+    osg::ShapeDrawable* shape = new osg::ShapeDrawable(new osg::Sphere(center,characterSize*0.2f));
+    shape->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::ON);
+    geode->addDrawable(shape);
+
+    osg::Group* rootNode = new osg::Group;
+    rootNode->addChild(geode);
+
+    return rootNode;    
+}
 
 class UpdateTextOperation : public osg::Operation
@@ -46 +482 @@
 public:
 
-  UpdateTextOperation(osg::Group* group):        
-      Operation("UpdateTextOperation", true),
-        _group(group),
+    UpdateTextOperation(const osg::Vec3& center, float diameter, osg::Group* group):        
+        Operation("UpdateTextOperation", true),
+        _center(center),
+        _diameter(diameter),
         _maxNumChildren(200),
-        _maxNumTextPerGeode(10)
-      {
-      }
-
-      virtual void operator () (osg::Object* callingObject)
-      {
+        _maxNumTextPerGeode(10),
+        _group(group)
+    {
+    }
+
+    virtual void operator () (osg::Object* callingObject)
+    {
         // decided which method to call according to whole has called me.
         osgViewer::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>(callingObject);
@@ -61 +499 @@
         if (viewer) update();
         else load();
-      }
-
-      void update()
-      {
+    }
+    
+    void update()
+    {
         // osg::notify(osg::NOTICE)<<"*** Doing update"<<std::endl;
-
+        
         OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
-
+        
         if (_mergeSubgraph.valid())
         {
-          _group->addChild(_mergeSubgraph.get());
-
-          _mergeSubgraph = 0;
-
-          if (_group->getNumChildren()>_maxNumChildren)
-          {
-            osg::Geode* geode = dynamic_cast<osg::Geode*>(_group->getChild(0));
-            if (geode)
+            _group->addChild(_mergeSubgraph.get());
+
+            _mergeSubgraph = 0;
+
+            if (_group->getNumChildren()>_maxNumChildren)
             {
-              _availableSubgraph.push_back(geode);
-              geode->removeDrawables(0,geode->getNumDrawables());
+                osg::Geode* geode = dynamic_cast<osg::Geode*>(_group->getChild(0));
+                if (geode)
+                {
+                    _availableSubgraph.push_back(geode);
+                    geode->removeDrawables(0,geode->getNumDrawables());
+                }
+                _group->removeChild(0,1);
             }
-            _group->removeChild(0,1);
-          }
-
-          _waitOnMergeBlock.release();
+            
+            _waitOnMergeBlock.release();
         }        
-      }
-
-      void load()
-      {
-
+    }
+    
+    void load()
+    {
+    
         // osg::notify(osg::NOTICE)<<"Doing load"<<std::endl;
 
         osg::ref_ptr<osg::Geode> geode;
         {
-          OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
-          if (!_availableSubgraph.empty())
-          {
-            geode = _availableSubgraph.front();
-            _availableSubgraph.pop_front();
-          }
+            OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
+            if (!_availableSubgraph.empty())
+            {
+                geode = _availableSubgraph.front();
+                _availableSubgraph.pop_front();
+            }
         }
-
+        
         if (!geode) geode = new osg::Geode;
 
         for(unsigned int i=0; i<_maxNumTextPerGeode; ++i)
         {
-          osg::Vec3 position(float(rand()) / float(RAND_MAX), float(rand()) / float(RAND_MAX), float(i)/float(_maxNumTextPerGeode));
-
-          std::string str;
-          unsigned int _numCharacters = 5;
-          for(unsigned int ni=0; ni<_numCharacters;++ni)
-          {
-            str.push_back(char(32.0 + (float(rand())/float(RAND_MAX))*128.0f));
-          }
-
-          osgText::Text* text = new osgText::Text;
-          text->setDataVariance(osg::Object::DYNAMIC);
-          text->setPosition(position);
-          text->setFont("times.ttf");
-          text->setText(str);
-          text->setCharacterSize(0.025f);
-          text->setAxisAlignment(osgText::Text::SCREEN);
-
-          geode->addDrawable(text);
+            float x = float(rand()) / float(RAND_MAX) - 0.5f;
+            float y = float(rand()) / float(RAND_MAX) - 0.5f;
+            float z = float(i)      / float(_maxNumTextPerGeode) - 0.5f;
+            osg::Vec3 position(x, y, z);
+
+            std::string str;
+            unsigned int _numCharacters = 5;
+            for(unsigned int ni=0; ni<_numCharacters;++ni)
+            {
+                str.push_back(char(32.0 + (float(rand())/float(RAND_MAX))*128.0f));
+            }
+                        
+            osgText::Text* text = new osgText::Text;
+            text->setDataVariance(osg::Object::DYNAMIC);
+            text->setPosition(_center + position * _diameter);
+            text->setFont("times.ttf");
+            text->setText(str);
+            text->setCharacterSize(0.025f * _diameter);
+            text->setAxisAlignment(osgText::Text::SCREEN);
+            
+            geode->addDrawable(text);
         }
 
 
         {        
-          OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
-          _mergeSubgraph = geode;
+            OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
+            _mergeSubgraph = geode;
         }
-
+        
         // osg::notify(osg::NOTICE)<<"Waiting on merge"<<std::endl;
 
         _waitOnMergeBlock.block();
 
-      }
-
-      virtual void release()
-      {
+    }
+    
+    virtual void release()
+    {
         _waitOnMergeBlock.release();
-      }
-
-      typedef std::list< osg::ref_ptr<osg::Geode> > AvailableList;
-
-      unsigned int                _maxNumChildren;
-      unsigned int                _maxNumTextPerGeode;
-
-      OpenThreads::Mutex          _mutex;
-      osg::ref_ptr<osg::Group>    _group;
-      osg::ref_ptr<osg::Geode>    _mergeSubgraph;
-      AvailableList               _availableSubgraph;
-      OpenThreads::Block          _waitOnMergeBlock;
-
-      unsigned int                _counter;
+    }
+
+    typedef std::list< osg::ref_ptr<osg::Geode> > AvailableList;
+
+    osg::Vec3                   _center;
+    float                       _diameter;
+    unsigned int                _maxNumChildren;
+    unsigned int                _maxNumTextPerGeode;
+    
+    OpenThreads::Mutex          _mutex;
+    osg::ref_ptr<osg::Group>    _group;
+    osg::ref_ptr<osg::Geode>    _mergeSubgraph;
+    AvailableList               _availableSubgraph;
+    OpenThreads::Block          _waitOnMergeBlock;
+    
+    unsigned int                _counter;
 
 };
@@ -164 +607 @@
 int main(int argc, char** argv)
 {
-  osg::ArgumentParser arguments(&argc, argv);
-
-
-  osg::Referenced::setThreadSafeReferenceCounting(true);
-
-  // construct the viewer.
-  osgViewer::Viewer viewer(arguments);
-
-  typedef std::list< osg::ref_ptr<osg::OperationThread> > Threads;
-
-  Threads operationThreads;
-  osg::ref_ptr<UpdateTextOperation> updateOperation;
-
-  unsigned int numThreads = 0;
-  if (arguments.read("--mt", numThreads) || arguments.read("--mt"))
-  {
-    // construct a multi-threaded text updating test.
-    if (numThreads==0) numThreads = 1;
-
-    // create a group to add everything into.
-    osg::Group* mainGroup = new osg::Group;
-
-    osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
-    mainGroup->addChild(loadedModel.get());
-
-    for(unsigned int i=0; i<numThreads; ++i)
-    {
-      osg::Group* textGroup = new osg::Group;
-      mainGroup->addChild(textGroup);
-
-      // create the background thread
-      osg::OperationThread* operationThread = new osg::OperationThread;
-
-      operationThreads.push_back(operationThread);
-
-      // create the operation that will run in the background and
-      // sync once per frame with the main viewer loop.
-      updateOperation = new UpdateTextOperation(textGroup);
-
-      // add the operation to the operation thread and start it.
-      operationThread->add(updateOperation.get());
-      operationThread->startThread();
-
-      // add the operation to the viewer to sync once per frame.
-      viewer.addUpdateOperation(updateOperation.get());
-
-
-      // add a unit cube for the text to appear within.
-      osg::Geode* geode = new osg::Geode;
-      geode->getOrCreateStateSet()->setAttribute(new osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK,osg::PolygonMode::LINE));
-      geode->addDrawable(new osg::ShapeDrawable(new osg::Box(osg::Vec3(0.5f,0.5f,0.5f),1.0)));
-
-      mainGroup->addChild(geode);
-    }
-
-    viewer.setSceneData(mainGroup);        
-  }
-  
+    osg::ArgumentParser arguments(&argc, argv);
+
+    // construct the viewer.
+    osgViewer::Viewer viewer(arguments);
+    
+    typedef std::list< osg::ref_ptr<osg::OperationThread> > Threads;
+
+    Threads operationThreads;
+    osg::ref_ptr<UpdateTextOperation> updateOperation;
+
+    unsigned int numThreads = 0;
+    if (arguments.read("--mt", numThreads) || arguments.read("--mt"))
+    {
+        // construct a multi-threaded text updating test.
+        if (numThreads==0) numThreads = 1;
+        
+        // create a group to add everything into.
+        osg::Group* mainGroup = new osg::Group;
+        
+        osg::Vec3 center(0.5f,0.5f,0.5f);
+        float diameter = 1.0f;
+        
+        osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
+        if (loadedModel.valid())
+        {
+            mainGroup->addChild(loadedModel.get());
+            
+            center = loadedModel->getBound().center();
+            diameter = loadedModel->getBound().radius() * 2.0f;
+        }
+        
+        for(unsigned int i=0; i<numThreads; ++i)
+        {
+            osg::Group* textGroup = new osg::Group;
+            mainGroup->addChild(textGroup);
+
+            // create the background thread
+            osg::OperationThread* operationThread = new osg::OperationThread;
+            
+            operationThreads.push_back(operationThread);
+
+            // create the operation that will run in the background and
+            // sync once per frame with the main viewer loop.
+            updateOperation = new UpdateTextOperation(center, diameter, textGroup);
+
+            // add the operation to the operation thread and start it.
+            operationThread->add(updateOperation.get());
+            operationThread->startThread();
+
+            // add the operation to the viewer to sync once per frame.
+            viewer.addUpdateOperation(updateOperation.get());
+
+
+            // add a unit cube for the text to appear within.
+            osg::Geode* geode = new osg::Geode;
+            geode->getOrCreateStateSet()->setAttribute(new osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK,osg::PolygonMode::LINE));
+            geode->addDrawable(new osg::ShapeDrawable(new osg::Box(center,diameter)));
+
+            mainGroup->addChild(geode);
+        }
+                
+        viewer.setSceneData(mainGroup);        
+    }
+    else
+    {
+        // prepare scene.
+        osg::Vec3 center(0.0f,0.0f,0.0f);
+        float radius = 1.0f;
+        
+        // make sure the root node is group so we can add extra nodes to it.
+        osg::Group* group = new osg::Group;
+        
+        {
+            // create the hud.
+            osg::Camera* camera = new osg::Camera;
+            camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
+            camera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);
+            camera->setViewMatrix(osg::Matrix::identity());
+            camera->setClearMask(GL_DEPTH_BUFFER_BIT);
+            camera->addChild(createHUDText());
+            camera->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
+
+            group->addChild(camera);
+        }
+
+        group->addChild(create3DText(center,radius));
+
+        // set the scene to render
+        viewer.setSceneData(group);
+    }
 
 #if 0
-  osgDB::writeNodeFile(*viewer.getSceneData(),"text.osg");
+    osgDB::writeNodeFile(*viewer.getSceneData(),"text.osg");
 #endif
 
-  viewer.addEventHandler(new osgViewer::StatsHandler());
-  viewer.addEventHandler( new osgViewer::ThreadingHandler );
-  viewer.addEventHandler( new osgViewer::WindowSizeHandler );
-
-
-  viewer.run();
-
-  if (!operationThreads.empty())
-  {
-    for(Threads::iterator itr = operationThreads.begin();
-      itr != operationThreads.begin();
-      ++itr)
-    {
-      (*itr)->cancel();
-    }
-  }
-
-  return 0;
+    viewer.addEventHandler(new osgViewer::StatsHandler());
+
+    viewer.run();
+    
+    if (!operationThreads.empty())
+    {
+        for(Threads::iterator itr = operationThreads.begin();
+            itr != operationThreads.end();
+            ++itr)
+        {
+            (*itr)->cancel();
+        }
+    }
 }