[osg-users] setViewMatrixAsLookAt not working to set the initial camera position

[Rodrigo Dias]

Hi,

I'm able to change the camera's position with TrackballManipulator. However, I'd like to change the camera's initial position, but all the examples I've found just won't work. My source code is:


Code:
#include <iostream>
#include <osg/Camera>
#include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator>
#include <osgViewer/Viewer>
#include <osgEarth/ImageLayer>
#include <osgEarth/Map>
#include <osgEarth/MapNode>
#include <osgEarthDrivers/tms/TMSOptions>
#include <osgEarthDrivers/gdal/GDALOptions>

using namespace std;
using namespace osg;
using namespace osgEarth;
using namespace osgEarth::Drivers;

int main (int argc, char** argv) {
	MapOptions mapOpt;
	mapOpt.coordSysType() = MapOptions::CSTYPE_PROJECTED;
	mapOpt.profile() = ProfileOptions("plate-carre");
	osg::ref_ptr<Map> map = new Map(mapOpt);
	{
		GDALOptions gdal;
		gdal.url() = "br_modified.tif";
		osg::ref_ptr<ImageLayer> layer = new ImageLayer( "BR", gdal );
		map->addLayer( layer );
	}
	{
		GDALOptions gdal;
		gdal.url() = "BRalt.tif";
		osg::ref_ptr<ElevationLayer> layer = new ElevationLayer( "SRTM", gdal );
		map->addLayer( layer );
	}
	osg::ref_ptr<MapNode> mapNode = new MapNode( map );
	osgViewer::Viewer viewer;
	viewer.setSceneData( mapNode.get() );
	viewer.setCameraManipulator( new osgGA::TrackballManipulator );

	Vec3 eye( 10000.0, 50000.0, 100000.0 ); // The position of your camera
	Vec3 center( 0.0, 0.0, 0.0 ); // The point your camera is looking at
	Vec3 up( 0.0, 1.0, 0.0 ); // The up-vector of your camera - this controls how your viewport will be rotated about its center and should be equal to [0, 1, 0] in a conventional graphics coordinate system
	viewer.getCamera()->setViewMatrixAsLookAt( eye, center, up );
	while ( !viewer.done() ) {
		viewer.frame();
	}
	return 0;
}




No matter which values I use for "eye", the camera always begins in the same position. Why is that?

Thank you!

Cheers,
Rodrigo

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