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Found five groundplane 3d models.

free
blendswap
Transparent object in the Compositor
free
thingiverse
Prusa I3 Hephestos Solid Groundplane
free
renderosity
The Picnic AreabyRichabri()
free
renderosity
Polygon City, the City Centerby2nd_World()
free
3dwarehouse
MSU Bea Wood Studio Theatre 2009 directing Class Groundplan