Paul Martz 12.02.2010 20:45: > The Camera's View matrix contains the eye position, if that's what > you're trying to obtain: > > osg::Matrix m( getCamera()->getViewMatrix() ); > osg::Vec3 eye( m(3,0), m(3,1), m(3.2) ); > > (OK, I might have row versus column order messed up, so swap the row and > column parameters if needed.) > -Paul >
What I'm actually trying to obtain is the line-of-sight in world space going from eye point to the where the mouse cursor points to. Any hints on that particular problem? > Volker Poplawski wrote: > > Hi everyone. > > > > I'm trying to calculate the line-of-sight line in world space, which > > involves mapping from window space. My approach works in principal, > > however the resulting positions are allways off by a small amount. > > > > Inside a osg::View I have: > > > > Matrixd m; > > m.preMult(getCamera()->getViewport()->computeWindowMatrix()); > > m.preMult(getCamera()->getProjectionMatrix()); > > m.preMult(getCamera()->getViewMatrix()); > > Matrixd inv; > > inv.invert(m); > > > > > > For example: I exspect > > Vec3d( winWidth/2, winHeight/2, 0.0 ) * inv ; > > > > to yield the camera/eye position. However the x,y,z coords differ in > > about 0.5% from the eyepos of getCamera()->getViewMatrixAsLookAt(). > > (Unless the camera is positioned in world origin) > > > > > > Do I miss something? > > > > > > Regards > > ......Volker > > > > > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
