Do you have a database to fly around in? If not, take a look at VirtualPlanetBuilder to build one...:)
-Shayne -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] 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 <shayne.tuel...@hill.af.mil> 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: osg-users-boun...@lists.openscenegraph.org > [mailto:osg-users-boun...@lists.openscenegraph.org] 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" > <shayne.tuel...@hill.af.mil> 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: osg-users-boun...@lists.openscenegraph.org > [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of > Matthew > Runo > Sent: Monday, January 02, 2012 10:18 AM > To: osg-users@lists.openscenegraph.org > 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 > osg-users@lists.openscenegraph.org > > 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 > osg-users@lists.openscenegraph.org > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
