/* File: ex_simple_viewer_better.c
*/

#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osgUtil/Optimizer>
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator>
#include <osgViewer/Viewer>
#include <iostream>

void usage()
{
    std::cout << "usage: ex_simple_viewer_better model\n";
    exit(0);
}

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

    // initialize the viewer.
    osgViewer::Viewer viewer;

    // load the nodes from the commandline arguments.
    osg::Node* model = osgDB::readNodeFile(argv[1]);
    if (!model)
    {
	std::cerr << "Problem opening model " << argv[1] << "\n";
        exit(1);
    }
    
    // make a root node so that you can change the orientation of the whole
    // scene by changing one node.
    // tilt the scene so the default eye position is looking down on the model.
    osg::MatrixTransform* rootnode = new osg::MatrixTransform;
    rootnode->setMatrix(osg::Matrix::rotate(osg::inDegrees(30.0f),1.0f,0.0f,0.0f));
    rootnode->addChild(model);

    // run optimization over the scene graph
    osgUtil::Optimizer optimzer;
    optimzer.optimize(rootnode);
     
    // set the scene to render
    viewer.setSceneData(rootnode);
    viewer.setCameraManipulator(new osgGA::TrackballManipulator());

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