The other thing to do, and the most important, is to locate the local origin where your text is *before* converting to floats. This will give you the most accuracy. I know the problem well and how to solve it, but don't know OSG so can't tell you how this is done in OSG.
best of luck, chris On 09/09/2007, sherman wilcox <[EMAIL PROTECTED]> wrote: > > Yeah, that sounds like it will do the trick. I'll have to re-work some > code, but that should address the issue. > > On 9/8/07, Jason Beverage <[EMAIL PROTECTED]> wrote: > > Hi Sherman, > > > > The issue you're seeing is probably a precision issue since OpenGL works > in > > floats. I've seen a similar effect with Text objects in my > applications. > > One way to reduce this precision problem is to to not position your text > > using the setPosition function but to position it by using a > MatrixTransform > > as the parent of the geode containing your text. This will allow OSG to > > accumulate the transformation and camera matrices in doubles and only > > convert to float the very last moment to increase precision. It is the > same > > technique that osgdem uses when managing its tiles. > > > > Hope this help! > > > > Jason > > > > > > On 9/8/07, 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 > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- http://ping.com.au http://systemic.com.au http://planet-earth.org/Rez/RezIndex.html -- It be a great secret: there be more truth at the centre.
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