> Sorry,but I have some new strange thing: It seems like all 
> nodes with entirely positive z coordinates are not displayed, 
> though my viewing volume still should be [-1.1] in z.

This is probably OSG's autocomputenearfar resetting your near and far
planes. Try disabling that. Search the mailing list archives for
"autocompute", that should show some discussion and tips.
   -Paul

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