Hi, R u working on Vizard software?
-- Regards Hitesh Singhal Electrical Engineering +91-8386837430 On Fri, Jun 19, 2015 at 8:23 AM, shilpa varri <[email protected]> wrote: > Hi, > > I'm using trackball manipulator to rotate my camera. > I have following inputs: > eye position, lookAtCenter position, up vector and spin center. > So basically I need to setup my trackballmanipulator such that it is > located at 'eye' position looking at 'lookAtCenter' position with 'up' > vector. But when I move my mouse I need the manipulator to rotate about > 'spin center' and not 'lookAtCenter'. > So the camera is looking at one point but rotating around a different > point. > > Now if I use the 'trackballmanipulator->setTransformation(eye, > lookAtCenter , up)' when I move the mouse it automatically moves along the > sphere of 'lookAtCenter'. > I'm not sure how to overwrite this behavior so that it's looking at > 'lookAtCenter' position but rotating about sphere of 'spin center'. > > I've calculated the rotation matrix to rotate about 'spin center'. But how > do I feed this to the trackballmanipulator to achieve the result? > Can anyone please help me? > > > Here's the code: > osg::Vec3d eye = osg::Vec3d(cameraPos.at(0), cameraPos.at(1), > cameraPos.at(2)); > osg::Vec3d viewVector = osg::Vec3d(cameraViewDirection.at(0), > cameraViewDirection.at(1), cameraViewDirection.at(2)); > osg::Vec3d lookAtCenter(eye + viewVector); > osg::Vec3d up = osg::Vec3d(cameraUpDirection.at(0), > cameraUpDirection.at(1), cameraUpDirection.at(2)); > > osg::Vec3d spinCenterVec = osg::Vec3d(spinCenter.at(0), > spinCenter.at(1), spinCenter.at(2)); > > osg::Matrixd transSpinToOrigin, transToSpinCenter, rotationAboutOrigin; > > transSpinToOrigin.makeTranslate(-spinCenterVec ); > transToSpinCenter.makeTranslate( spinCenterVec ); > rotationAboutOrigin.makeRotate( osg::DegreesToRadians(0.5), > osg::Vec3d(1,0,0), > osg::DegreesToRadians(0.5), osg::Vec3d(0,1,0), > osg::DegreesToRadians(0.5), osg::Vec3d(0,0,1) ); > > m_customRotationMat = new osg::Matrixd(transToSpinCenter * rotationMat > * transSpinToOrigin); > > trackBallManipulator->setTransformation(eye, referencePtVector, up); > > //After this, how do I use 'm_customRotationMat'? I've started overriding > the manipulator class so I can use this somewhere. But I still don't know > how? > > Any help is much appreciated! > Thank you! > > Cheers, > avatarZ > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=64125#64125 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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