Geometry: - No isolated vertices - No coincident vertices - No coincident/coplanar faces - Correct face normals - No empty objects

Topology: - Quads and Triangles only - Model can be cleanly subdividable

Other: - lighting and cameras are not included in the product (Model file includes only the 3D model) - Model Scale: real-world scale - Model after 'reset xForm' - Model centred at origin (0,0,0) - all objects are named and logically grouped

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