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Getting the size of the bounding box of a Graphics3D[]

• To: mathgroup at smc.vnet.net
• Subject: [mg88395] Getting the size of the bounding box of a Graphics3D[]
• From: Szabolcs Horvát <szhorvat at gmail.com>
• Date: Sat, 3 May 2008 06:31:47 -0400 (EDT)
• Organization: University of Bergen

Is there a reliable way to get the coordinates and size of the bounding 
box of a Graphics3D object?

I tried

PlotRange /. AbsoluteOptions[Graphics3D[Sphere[]]]

but it gives {{0., 1.}, {0., 1.}, {0., 1.}}, whereas the correct answer 
should be {{-1., 1.}, {-1., 1.}, {-1., 1.}}.