Re: [osg-users] openscenegraph openGL context error in Qt

[Lokesh Kumar]

gambr wrote:
 Hi Lokesh,
 you can find an osgviewerQT example in osg distribution. Anyway I attach an 
 example of a CompositeViewer I'm using for testing that is a little bit 
 different. It uses osgQt.
 
 Cheers,
 Gianni


thanks gambr for reply.
yeah.. i will give try to your attached osgQt widget example.

also, i have solved my problem by deleting layout object and creating whole new 
layout object and placing QGLWidget into it. 


Code:
  
removeQMLview();   //destroying QQuikview
delete layout();   //deleting Borderlayout with centered QQuikview 

 



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[osg-users] openscenegraph window in qt not showing

[Lokesh Kumar]

Hi,
what i'm doing:-
 i'm creating an OpenSceneGraph based application by integrating
openscenegraph scene with QT GUI windowing system.
 
i'm using QML based UI navigation (QML views sits inside a QWidget which in
turn sits inside Borderlayout(as center widget) of Parent QWidget(main window)).

I'm switching QML UI's with signal slots mechanism, and on particular button
selection on QML view(qml signal to c++ QWidget), i'm removing current QML
view with QGLWidget which is paintaing OpenSceneGraph by calling osgViewer
frame() from paintEvent(QPaintEvent *):-

my problem :- 

 getting continues error on console : QOpenGLContext::swapBuffers()
 called with non-exposed window, behavior is undefined



code(not full) :-


 
 
   
 osg::Camera* createCamera(int x, int y, int w, int h )
{
  osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();
 
  osg::ref_ptrosg::GraphicsContext::Traits traits = new
 osg::GraphicsContext::Traits;
  traits-windowDecoration = false;
  traits-x = x;
  traits-y = y;
  traits-width = w;
  traits-height =  h;
  traits-doubleBuffer = true;
 
  osg::ref_ptrosg::Camera camera = new osg::Camera;
  osgQt::initQtWindowingSystem();
  QGLFormat format = 
 osgQt::GraphicsWindowQt::traits2qglFormat(traits.get());
 
  osgQt::GLWidget* glwidget = new osgQt::GLWidget(format,0, 0, 0, true);
 
  camera-setGraphicsContext(new osgQt::GraphicsWindowQt(glwidget));
 
  camera-setClearColor( osg::Vec4(0.2, 0.2, 0.6, 1.0) );
  camera-setViewport( new osg::Viewport(0, 0, traits-width,
 traits-height) );
 
  camera-setProjectionMatrixAsPerspective(40.0f,
 static_castdouble(traits-width)/static_castdouble(traits-height),
 0.1f, 1000.0f );
 
  return camera.release();
 
}
   
 
 
 class GuiMainWindow:public QWidget
 {
 
  Q_OBJECT
 
  public:
 
 GuiMainWindow()
 {  
QDesktopWidget desktop;
QRect screen= desktop.screenGeometry();
WIDTH=screen.width();
HIGHT=screen.height();
 
_camera=createCamera(0,0,WIDTH,HIGHT);
_osgroot=new osg::Group;
_osgroot-addChild(osgDB::readNodeFile(c:/data/tank.flt)); 
}
 
 virtual void paintEvent(QPaintEvent *)
{
  if(osg_init)
_viewer.frame();
}
 
void setOsgScene(osg::Group* root,osg::Camera* camera)
{ 
  _viewer.setSceneData(root);
  _viewer.setCamera(camera);
  _viewer.setCameraManipulator(new osgGA::TrackballManipulator);
 
  _viewer.setThreadingModel( osgViewer::Viewer::SingleThreaded);
 
  osgQt::GraphicsWindowQt* gw 
 =dynamic_castosgQt::GraphicsWindowQt*(camera-getGraphicsContext());
 
 
  if(gw)
 {
   _layout_center_widget=gw-getGLWidget();
   
   _layout_center_widget=glw;
  
   _layout_center_widget-setFocusPolicy(Qt::TabFocus);
   
   _base_layout_pane-addWidget(_layout_center_widget, 
 BorderLayout::Center);
   _base_borderLayout-update();

 }
 
 connect( _render_timer, SIGNAL(timeout()), this, SLOT(update()));

 osg_init=true;
 
 _render_timer.start(16.66);
 
}
 
   void removeQmlView()
   {
qDebug(removing current Qml view..);
if(_qml_view)
   _qml_view-destroy();
   }
 
   void removeCenterWidget()
   {
   if(_layout_center_widget)
   {
   qDebug(removing current center_widget..);
   _base_borderLayout-removeWidget(_layout_center_widget);
 
   }
  
   }
 
   void nextUIFrame(QString str)
   {
 
  
  if(str.compare(OSG,Qt::CaseInsensitive)==0)
 {
qDebug(OSG Window from QML);

removeQmlView();  
removeCenterWidget();
 
setOsgScene(this-_osgroot,this-_camera);
 
   return;
 }
 
 if(str.compare(SPLASH,Qt::CaseInsensitive)==0)
 {
 
   Loader* loader=Loader::getInstance();
   OSGutil::osgResourceManager* 
 osgResmng=OSGutil::osgResourceManager::getInstance();
 
   removeQmlView(); 
 
   _qml_view=new QQuickView();
   _qml_view-rootContext()-setContextProperty(GuiWindowCpp,this);
 
   _qml_view-setSource(QUrl::fromLocalFile(c:/splash.qml);
   QQuickItem* obj=_qml_view-rootObject();
 
 
  
 connect(loader,SIGNAL(feedProgressInfo(QVariant)),obj,SLOT(printCurrentLabel(QVariant)));
  
 connect(osgResmng,SIGNAL(feedProgressData(QVariant)),obj,SLOT(printCurrentValue(QVariant)));
 
   removeCenterWidget();
 
   
 _layout_center_widget=QWidget::createWindowContainer(_qml_view,this);
   

[osg-users] How to apply multiple textures to a model in openscenegraph?

[Lokesh Kumar]

Hi,

I have a flt model and multiple *.dds texture files in a Directory :-

my folder  directory structure:-


 my_folder
|- terrain.flt
|- road.dds 
|- city.dds 
|- building1.dds 
|- building2.dds
|- building3.dds 
|- building3.dds 
|- building4.dds 
|- building5.dds 
|- banner1.dds
|- banner1.dds




I know how to read and apply single  .dds texture file to my model 
(terrain.flt) :-


Code:
osg::ref_ptrosg::Node terrainModel 
(osgDB::readNodeFile(c:/my_folder/terrain.flt));
osg::ref_ptrosg::Texture2D tex (new osg::Texture2D);
osg::ref_ptrosg::Image image (osgDB::readImageFile(c:/my_folder/road.dds 
));

tex-setImage(image.get());

osg::ref_ptrosg::StateSet state=terrainModel-getOrCreateStateSet(); 

state-setTextureAttributeAndModes(0,tex.get(),osg::StateAttribute::ON);







but i don't know how to read and apply all these textures to my model 
(terrain.flt).

my attempt :-


Code:
osg::ref_ptrosg::Node terrainModel 
(osgDB::readNodeFile(c:/my_folder/terrain.flt));
 
osg::ref_ptrosg::Texture2DArray texArray (new osg::Texture2DArray);

for(int i=0;ifolder_files.size();i++)
{
   osg::ref_ptrosg::Image image 
(osgDB::readImageFile(c:/my_folder/+file(i)));
   texArray-setImage(i,image);
  
}  
   
osg::ref_ptrosg::StateSet state=terrainModel-getOrCreateStateSet(); 


state-setTextureAttributeAndModes(0,texArray.get(),osg::StateAttribute::ON);




but, it is not working. Help me. 

Thank you!

Cheers,
Lokesh

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[osg-users] opengl errors in compiling Openscenegraph 3.1.8 with Qt 5.0.2

[Lokesh Kumar]

Hi,

 
I'm trying to compile openscenegraph-3.1.8 with Qt 5.0.2 using mingw-32 
compiler after configuring with cmake 2.8.11 on windows 7 (basic).

But, in the compilation process i got the following errors :-


Code:
In file included from 
C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/QtGui/qopengl.h:55:0,
 from C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/QtOpenGL/qgl.h:47,
 from 
C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/QtOpenGL/QGLWidget:1,
 from C:/OpenSceneGraph-3.1.8/include/osgQt/GraphicsWindowQt:24,
 from C:\OpenSceneGraph-3.1.8\src\osgQt\GraphicsWindowQt.cpp:15:
C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/GLES2/gl2.h:38:26: error: conflicting 
declaration 'typedef khronos_intptr_t GLintptr'
In file included from C:/OpenSceneGraph-3.1.8/include/osg/Array:34:0,
 from C:/OpenSceneGraph-3.1.8/include/osg/Uniform:23,
 from C:/OpenSceneGraph-3.1.8/include/osg/StateSet:20,
 from C:/OpenSceneGraph-3.1.8/include/osg/State:18,
 from C:/OpenSceneGraph-3.1.8/include/osg/GraphicsContext:17,
 from 
C:/OpenSceneGraph-3.1.8/include/osgViewer/GraphicsWindow:17,
 from C:/OpenSceneGraph-3.1.8/include/osgQt/GraphicsWindowQt:17,
 from C:\OpenSceneGraph-3.1.8\src\osgQt\GraphicsWindowQt.cpp:15:
C:/OpenSceneGraph-3.1.8/include/osg/BufferObject:47:21: error: 'GLintptr' has a 
previous declaration as 'typedef int GLintptr'
In file included from 
C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/QtGui/qopengl.h:55:0,
 from C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/QtOpenGL/qgl.h:47,
 from 
C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/QtOpenGL/QGLWidget:1,
 from C:/OpenSceneGraph-3.1.8/include/osgQt/GraphicsWindowQt:24,
 from C:\OpenSceneGraph-3.1.8\src\osgQt\GraphicsWindowQt.cpp:15:
C:/Qt/Qt5.0.2/5.0.2/mingw47_32/include/GLES2/gl2.h:39:26: error: conflicting 
declaration 'typedef khronos_ssize_t GLsizeiptr'
In file included from C:/OpenSceneGraph-3.1.8/include/osg/Array:34:0,
 from C:/OpenSceneGraph-3.1.8/include/osg/Uniform:23,
 from C:/OpenSceneGraph-3.1.8/include/osg/StateSet:20,
 from C:/OpenSceneGraph-3.1.8/include/osg/State:18,  
 from C:/OpenSceneGraph-3.1.8/include/osg/GraphicsContext:17,
 from 
C:/OpenSceneGraph-3.1.8/include/osgViewer/GraphicsWindow:17,
 from C:/OpenSceneGraph-3.1.8/include/osgQt/GraphicsWindowQt:17,
 from C:\OpenSceneGraph-3.1.8\src\osgQt\GraphicsWindowQt.cpp:15:
C:/OpenSceneGraph-3.1.8/include/osg/BufferObject:48:21: error: 'GLsizeiptr' has 
a previous declaration as 'typedef int GLsizeiptr'



I searched google as well google regarding these conflicting declaration errors 
on google errors, but didn't find anything. 
Please help me.

Thank you!

Cheers,
Lokesh[/code]

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Attachments: 
http://forum.openscenegraph.org//files/compilation_errors_935.txt


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[osg-users] How to apply textures to a model in openscenegraph?

[Lokesh Kumar]

Hi,

I have a flt model and multiple *.dds texture files in a Directory :-

my folder contains :-

(1) terrain.flt
(2) road.dds 
(3) buildings.dds
(4) banners.dds

I know how to read and apply single  .dds texture file to my model 
(terrain.flt) :-

osg::ref_ptrosg::Node terrainModel (osgDB::readNodeFile
(c:/my_folder/terrain.flt));
osg::ref_ptrosg::Texture2D tex (new osg::Texture2D);
osg::ref_ptrosg::Image image (osgDB::readImageFile
(c:/my_folder/road.dds ));

tex-setImage(image.get());

osg::ref_ptrosg::StateSet state=terrainModel-getOrCreateStateSet(); 

state-setTextureAttributeAndModes(0,tex.get
(),osg::StateAttribute::ON);



but i don't know how to read and apply all these textures to my model 
(terrain.flt).

Help me.

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Re: [osg-users] How to apply textures to a model in openscenegraph?

[Lokesh kumar]

Robert Osfield robert.osfield@... writes:

 
 Hi Lokesh,
 
 Your OpenFlight model references all the textures it needs, and if you
 want to replace or apply new ones you should simply reload the model
 in Creator or other compatible modelling tool and apply the changes
 you need then save again.
 
 Robert.
 


hi Robert,

I have a FLT model which has references to *.tga texture files(with proper
UV mapping).

i converted these *.tga files into *.dds texture files using Nvidia DDS
utility tool (nvdxt.exe).

now, i want to load and apply these *.dds texture files to my original FLT
model.


-Lokesh  


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Re: [osg-users] How to apply textures to a model in openscenegraph?

[Lokesh kumar]

Robert Osfield robert.osfield@... writes:

 
 Hi Lokesh,
 
 The easist thing to do would be to use osgconv to convert the files to
 native OSG binary format .osgb and have osgconv do the compression for
 you.  Use osgconv --help for the options.  The other alternative to to
 write your own osgDB::Registry::ReadFile callback that intercepts the
 readImage calls and changes the filename to the .dds equivalent.
 
 Robert.
 


Thank you Robert!!

I'm interested in your 2nd alternative :- 

using osgDB::Registry::ReadFile  


but, i'm Newbie in openscenegraph.
can you give a short example.

Regards
-Lokesh 



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Re: [osg-users] How to apply textures to a model in openscenegraph?

[Lokesh Kumar]

Sergey Kurdakov sergey.forum@... writes:

 
 Hi Lokesh
 
 in http://www.packtpub.com/openscenegraph-3-0-beginners-guide/book on
 support tab for the page of the book you may download sample code,
 
 in \2824_12_Code\2824_12_Code folder from  download zip there is
 sharing_textures.cpp which has a class
 
 class ReadAndShareImageCallback : public osgDB::ReadFileCallback
 
 you are looking for as example
 
 make something similar, but before loading texture - change extension
 of loaded image
 
 I recommend to get existing osg books and read them - it will save you
 a lot of time.
 In India see
http://www.junglee.com/mn/search/junglee/ref=nav_sb_noss?url=search-alias%3Dstripbooksfield-keywords=openscenegraph
 
 Regards
 Sergey
 

Thank you Sergey Kurdakov,  

Openscenegarph 3.0 cookbook seems quite comprehensive.
so, i'm going for it.
 

really helpful.

-Lokesh





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