i have a dxf file containing several 3d building models which are independent objects in AutoCAD. But when i use 'load 3ds files' in 3D analyst, the resulted shape file contains only one grouped object. i tried several versions of dxf, 'r12', '2000' and others. i also tried direct 'add layer', 'quick import' in Interoperability module, which did not give any result. Please find attached file.