mid: 1414
url: http://www.3dspecial.com/images/tank+.zip
ref_url: http://www.3dspecial.com/index.html
format: dxf 
pid: 25103
polygons: 19743
connected_components: 5087
average_dihedral_angle: 1.22514
bounding_box: xmin = 0.025, ymin = 0.025, zmin = 0.025, xmax = 0.450984, ymax = 0.357538, zmax = 0.975
avg_depth: 4.488293
center: (0.260418,0.149671,0.381588)
scale: 0.492424
principle_axes: (-0.005692,0.004235,-0.999975), (0.996151,-0.087449,-0.006040), (0.087472,0.996160,0.003721)
principle_values: (0.041018,0.019358,0.006389)