Thank you all for your replies, Much appreciated. I understand about how 3D graphics works in regards to coordinate systems and such and i understand how I want the scene to act and work, its just getting the code to actually make this happen. Going about applying the two transforms to my sphere is where i am stuck because i dont have a firm grasp with the OSG language.
For example, below rotates a sphere that is originally placed as 10,0,0 around 0,0,0 (imagine that is where a sun is placed), whilst it is doing that i also need it to rotate on its own central axis. As it will be spinning on its own XYZ which will change as it rotates i choose its current XYZ postion as the point on which to rotate using the getCenter() method, still cant get it working though. Code: PositionAttitudeTransform *rotate_planetFive = new PositionAttitudeTransform; rotate_planetFive->addChild( geode_planetFive ); rotate_planetFive->setUpdateCallback( new AnimationPathCallback(osg::Vec3(0,0,0), osg::Z_AXIS, inDegrees(45.0f)) ); //ROTATE AROUND THE SUN Vec3 central_point = primitive_planetFive->getCenter(); //GET THE CURRENT LOCATION OF THE CIRCLE WHILST IS ROTATES PositionAttitudeTransform *rotate_planetFiver = new PositionAttitudeTransform; rotate_planetFiver->addChild( geode_planetFive ); rotate_planetFiver->setUpdateCallback( new AnimationPathCallback(osg::Vec3(central_point), osg::Z_AXIS, inDegrees(45.0f)) ); //USING THE SPHERE CURRENT LOCATION, ROTATE AROUND IT. Doing this and, as expected, two spheres are shown, one that stays at its original location and just spins and another that "orbits" around 0,0,0. Now I need to combine both of the transforms onto a single sphere, but i just cant figure out the code for that. I tried this: Code: PositionAttitudeTransform *rotate_planetFive = new PositionAttitudeTransform; rotate_planetFive->addChild( geode_planetFive ); rotate_planetFive->setUpdateCallback( new AnimationPathCallback(osg::Vec3(0,0,0), osg::Z_AXIS, inDegrees(45.0f)) ); //ROTATE AROUND THE SUN Vec3 central_point = primitive_planetFive->getCenter(); //GET THE CURRENT LOCATION OF THE CIRCLE WHILST IS ROTATES rotate_planetFive->setUpdateCallback( new AnimationPathCallback(osg::Vec3(central_point), osg::Z_AXIS, inDegrees(45.0f)) ); But that doesnt work, it only applies the second setUpdateCallback() when i need both to run. Sorry if it seems I am posting excessively, I just get a little bit obsessive when I cant get the coding correct, Apologies. ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=24203#24203 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
