Redraw error

Hi,

I wrote a little sample program to test selection using Coin3D and the 
SoQt lib on SuSE Linux Pro 8.0.

The program compiles without any problem but as I click to select an 
object, it crashes with a "Memory Access Error".

The sample program is similar to the sample code that comes with the 
Coin Do***entation.

Here's the code:

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/nodes/SoBaseColor.h>
#include <Inventor/nodes/SoCone.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoSelection.h>
#include <Inventor/nodes/SoGroup.h>
#include <Inventor/actions/SoBoxHighlightRenderAction.h>

static SoSelection *group_node=NULL;

void made_selection( void * userdata, SoPath * path )
   {
     (void)fprintf( stdout, "%sselected %s\n",
                    userdata == (void *)1L ? "" : "de",
                    path->getTail()->getTypeId().getName().getString() );

     group_node->touch(); // to redraw
   }

int main(int argc, char ** argv) {
	// Initializes SoQt library (and implicitly also the Coin and Qt
	// libraries). Returns a top-level / shell Qt window to use.
	QWidget * mainwin = SoQt::init(argc, argv, argv[0]);
	
	// Make a dead simple scene graph by using the Coin library, only
	// containing a single yellow cone under the scenegraph root.
	SoSeparator * root = new SoSeparator;
	SoSelection *group_node=new SoSelection;
	
	group_node->policy = SoSelection::****FT;
	group_node->ref();
	
	SoBaseColor * col = new SoBaseColor;
	col->rgb = SbColor(1, 1, 0);
	group_node->addChild(col);
	
	group_node->addChild(new SoCone);
	group_node->addSelectionCallback( made_selection, (void *)1L );
	//group_node->touch();
     group_node->addDeselectionCallback( made_selection, (void *)0L );
	//group_node->touch();
	
	// Use one of the convenient SoQt viewer cl*****.
	SoQtExaminerViewer * eviewer = new SoQtExaminerViewer(mainwin);
	eviewer->setSceneGraph(group_node);
	eviewer->setGLRenderAction( new SoBoxHighlightRenderAction );
     eviewer->setViewing( FALSE );
	eviewer->show();
	
	// Pop up the main window.
	SoQt::show(mainwin);
	// Loop until exit.
	SoQt::mainLoop();
	
	// Clean up resources.
	delete eviewer;
	group_node->unref();
	
	return 0;
}

Anyone can help?

Thanks in advance,

Dennis Schramm

-- 
batchtranscode.sourceforge.net

"Sie war so fett, ich musste sie in Mehl waelzen, um die feuchte Stelle 
zu finden!"