Hi Drew The TrackballManipulator is overriding your setting of viewmatrix! The call to frame will (in the updatetraversal) update the ViewMatrix local to the TrackbalManipulator, then your viewer goes and collects a currect ViewMatrix from an attached CameraManipulator (which is the TrackballManipulator) before rendering. If you don't want a TrackballManipulator you should call setCameraManipulator(0), probably after viewer.realize() since that call installs a TrackballManipulator if none was found. Only then will your setViewMatrix take effect. Given your task description what you should probably do is code your own CameraManipulator. There are some (more or less complex) examples in the osgGA source, but basically a CameraManipulator is responsible for responding to events of your choice (mouse, keyboard etc.) and then produce a ViewMatrix (actually the view retreives the InverseViewMatrix from a connected CameraManipulator)
Also - see the osgmanipulator example cheers /Mattias On Sat, Sep 28, 2013 at 6:47 AM, Andrew Nelson <[email protected]> wrote: > Hi Everyone, > > I'm new to using OSG so please forgive me if some of my terms or ideas are > incorrect. My overall goal currently is to simply rotate the camera(x-axis, > y-axis, and/or z-axis), based on the users mouse position(i.e. when the user > moves the mouse in any direction, camera rotates - rather than click and > drag). For now, I've just been trying to rotate(or even translate) the > camera(in any way) of the BasicGeometry.cpp program just so I can start to > get the idea. What I have so far: > > . > . > . > //viewer defined as osgViewer::Viewer viewer; > viewer.setCameraManipulator(new osgGA::TrackballManipulator()); > viewer.realize(); > while( !viewer.done() ) > { > osg::Matrixd cameraRotation; > osg::Matrixd cameraTrans; > cameraRotation.makeRotate(osg::DegreesToRadians(-20.0), > osg::Vec3(0,1,0), // roll > osg::DegreesToRadians(-15.0), osg::Vec3(1,0,0) , // pitch > osg::DegreesToRadians( 10.0), osg::Vec3(0,0,1) ); // heading > cameraTrans.makeTranslate( 10,-50,15 ); > viewer.getCamera()->setViewMatrix(cameraTrans * cameraRotation); > viewer.frame(); > } > > > My thinking is that by setting up a rotation matrix and a translation matrix, > the product of these matrices would provided by the desired position. Then, > with this we can set the viewer's camera to this desired matrix. > > The code compiles and runs, but this doesn't operate as planned. Could > someone explain why this process doesn't work and how I should approach this > issue? > > Any help is much appreciated. > Thank you! > > Cheers, > Drew > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=56531#56531 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
