The 3d extents of a level will control the visibility of that level across
the entire project, where the 2d extents controls it per view.
--
Paul Monsef
TSA architects, pllc
"jiaoyanbing" wrote in message
news:11750609.1110985443285.JavaMail.jive@jiveforum1.autodesk.com...
> what is the distiction between 2d and 3d level.thank.