The verts of a model in maya is diffrent to the one in unity3d

hi.

i import a model ( a fbx file ) from maya to unity3d. then unity3d said : Meshes have may not have more than 65000 vertices at the moment, and i can't see my model in unity3d.

but my model is 19000 verts in maya , far from 65000 verts.

i don't know why .

i test a few models in maya and unity3d, i found that all the vertices of models are diffrent

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Vertices in Unity (and any realtime 3D engine) need to be split on UV seams and hard edges. So a standard cube, for example, would need to be 24 vertices when imported (4 for each side), even if your modeling app says 8.