Years ago, we wrote an earth-viewer program in which we had a requirement that we had to be able to zoom all the way from space, down to an item the size of a quarter and smaller, smoothly. Your images look like an issue we had at the time, which was a floating point precision problem. The openGL stacks we had apparently could only use floats, and did all matrix multiplication as floats (even if the matrices we passed in were doubles). The fix was to maintain our own matrix stack (of doubles) and do all matrix multiplication ourselves, and load the finished matrix into GL on each frame.
I don't know if it's possible to configure OpenGL now to use doubles for its matrix stacks instead of floats, but, if so, I bet that would fix your problem. --- sherman wilcox <[EMAIL PROTECTED]> wrote: > I'm having a bit of trouble with mangled text if I > zoom in to close. > This text is on an osgDem generated ellispoid. In > the attached > screenshots, the text appears correctly in > text2.jpg. However, in > text3.jpg you'll see the problem. This only occurs > if I zoom in really > close to the text. If I back off the camera a bit, > the text reverts > back to the correct state. > > My questions are: > > 1) What's causing this? > 2) How best to address the issue? > > _______________________________________________ > 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
