I have also used OSG on 64-bit Linux without any problems. I know nothing about 64-bit Windows. On Mac OSX, OSG is not 64-bit capable because the windowing functions used to glue OSG to the windowing system are Carbon-based, and they are deprecated and are not available for 64-bit programs. A few developers are working on transitioning away from Carbon toward Cocoa for these bindings to enable 64-bit applications but progress is slow. My recent work to finish the osgviewerCocoa example (written by Eric Wing) is one small step in this direction. -Eric
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