I already built one using VirtualPlanetBuilder and some GeoTIFF files I got from the USGS Seamless server. I've been looking at that using the example programs, trying to learn what's what.. VPB makes things so simple, it's pretty amazing.
--Matthew On Tue, Jan 3, 2012 at 9:33 AM, Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC <[email protected]> wrote: > Do you have a database to fly around in? If not, take a look at > VirtualPlanetBuilder to build one...:) > > -Shayne > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Matthew Runo > Sent: Tuesday, January 03, 2012 9:37 AM > To: OpenSceneGraph Users > Subject: Re: [osg-users] Newbie Questions re: Camera control (I think) > > I'm just working on a project to learn OSG, etc. For now, I've written > a plugin for a flight simulator that will give me the GPS coords, > altitude, heading etc.. and I wanted to see if I could get OSG to > follow along with that data feed on my laptop. > > That's why I was asking about positioning the camera in space - I > wanted to look at the same thing I was looking at in XPlane. I > figured this would be a fun way to combine my interest in programming > and aviation, while learning OpenGL/C++/OSG in the process. > > For now, I'll check out the EllipsoidModel. At first glance, it looks > like I'll be good friends with this method by the end of things: > > void osg::EllipsoidModel::convertLatLongHeightToXYZ > > Going from the little I know, I could take those XYZ coords and place > them into a matrix and then use that in the Viewer. I just need to > work backwards from the input to Camera->setViewMatrix to find the > APIs for creating that matrix.. > > --Matthew > > On Tue, Jan 3, 2012 at 8:01 AM, Tueller, Shayne R Civ USAF AFMC 519 > SMXS/MXDEC <[email protected]> wrote: >> Matthew, >> >> Perhaps you can elaborate a bit more on what you're trying to accomplish >> with OSG. That way the community can be in a better position to offer some >> advice and help. >> >> There are plenty of resources online that can help with understanding the >> OpenGL transformation pipeline. There's always the OpenGL "redbook" >> http://www.opengl.org/documentation/red_book/. Paul Martz has a great book >> as well that you can read for introduction http://www.opengldistilled.com/. >> This is a good place to start. >> >> If you google "OpenGL transformation pipline", many hits and resources will >> come up that can help you. >> >> As for converting geodetic to geocentric coordinates, OSG can help you with >> that. Take a look at the EllipsoidModel class in OSG... >> >> Regards, >> -Shayne >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of Matthew Runo >> Sent: Tuesday, January 03, 2012 8:32 AM >> To: OpenSceneGraph Users >> Subject: Re: [osg-users] Newbie Questions re: Camera control (I think) >> >> Hello - >> >> I really appreciate your reply... part of my problem is not knowing the >> proper terms to even be able to search for what I want... I think you're >> correct in suggesting she reading about OpenGL as well. Do you happen to >> have any suggestions? >> >> I'll look around for converting the geodetic coordinates to cartesian >> coordinates, which I assume must be based on the GeoTIFF scale I used as >> input.. That gives me something to search for! >> >> I'll also look up the view matrix discussions you mentioned here.. thanks! >> >> If course, any links to code, sample code, etc that you can provide would be >> a great help for jumping off. Its much easier to search for class and method >> names rather than abstract ideas.. >> >> Again, thank you! >> >> Matthew >> >> On Jan 3, 2012 7:19 AM, "Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC" >> <[email protected]> wrote: >> >> >> Matthew, >> >> Geodetic coordinates (lat,lon,alt) are typically mapped into some sort >> of Cartesian coordinate system (x,y,z) (i.e. geocentric coordinates). >> Setting the view matrix will operate in the latter CS. >> >> The projection matrix does not control where you are looking. The view >> matrix determines that. The projection matrix controls the viewing >> frustum. Perhaps a review of the OpenGL transformation pipeline is >> appropriate here. >> >> Orientation (h,p,r) and position are concatenated together to form the >> view matrix. This topic has been discussed on how to manually set the >> view matrix to your liking. >> >> If you need some code snippets to get started, that can be >> provided...:) >> >> -Shayne >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of >> Matthew >> Runo >> Sent: Monday, January 02, 2012 10:18 AM >> To: [email protected] >> Subject: [osg-users] Newbie Questions re: Camera control (I think) >> >> Hi, >> >> I found the CameraControl wiki page, but it has a warning that it's >> out >> of date.. and I don't know how to update it to the osgViewer class >> because I can't get to the documentation (that, and I'm reasonably new >> to C++). >> >> - Given a point in 3d space with World Coordinates (eg, Latitude, >> Longitude, Altitude), how can I position the viewer at that point? I'm >> thinking that I need to create a matrix with my points in it, and then >> call camera.setViewMatrix(..). Is that correct? How do I convert my >> world coordinates into coordinates that will work in the camera? >> >> - Once I'm at that point, do I use camera.setProjectionMatrix to >> control >> where I'm looking? For example, say I want to look due North at lat >> 26, >> long -119, altitude 52. >> >> - Given a set of rotations that should happen to the camera (roll 3 >> degrees right, pitch 4 degrees up, etc), are those best handled by >> looking at the examples from osgGA::FirstPersonManipulator and going >> from there by building up a Matrix to use somewhere to rotate the >> camera's view? >> >> As of right now I've been tinkering with the code for the various >> implementations of the osgGA::FirstPersonManipulator and learning >> quite >> a bit - I just wanted to get these questions in my mind cleared up. >> I'm >> sorry that they're so basic =\ >> >> Thank you very much for your help, and for this community full of >> knowledge! >> >> Thank you again, >> Matthew >> >> ------------------ >> Read this topic online here: >> http://forum.openscenegraph.org/viewtopic.php?p=44529#44529 >> >> >> >> >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or >> g >> <http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g> >> _______________________________________________ >> 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 > _______________________________________________ > 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 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
