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 > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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