Hi ? There isn't any way to know what settings are provoking these errors, the best thing you can do is compile a debug version of the OSG and then setup into the AutoTransform traverse method to figure out what maths is being invoked and when the errors are occurring.
The only thing I can add is that osgText::Text has support for rotating to screen and automatically scaling that for most purposes will make osg::AutoTransform rendundent. I would try to just use osgText::Text's support for scaling and rotating and ditch the osg::AutoTransform. You'll get better performance too. Cheers, Robert.
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