/* File: ex_simple_viewer.c
*/

#include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator>
#include <osgViewer/Viewer>
#include <iostream>

void usage()
{
    std::cout << "usage: ex_simple_viewer model\n";
    std::cout.flush();
    exit(1);
}

int main( int argc, char **argv )
{
    if (argc != 2)
        usage();

    // load the nodes from the commandline arguments.
    osg::Node* model = osgDB::readNodeFile(argv[1]);
    if (!model)
    {
	std::cerr << "Problem opening model " << argv[1] << "\n";
	usage();
    }
    
    // initialize the viewer and set the scene to render
    osgViewer::Viewer viewer;
    viewer.setSceneData(model);
    viewer.setCameraManipulator(new osgGA::TrackballManipulator());

    // normal viewer usage.
    return viewer.run();
}