Copy a external fbx file uv channel to a ustaticmesh? Is it possiable?

Development Programming & Scripting C++
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1

Hi, i want to read a fbx(was export from UE4) through fbx sdk. then get uv channel info. like Map<PolyVertIndex,FbxVector2>.

UStaticMesh::SetUVChannel
bool SetUVChannel
(
int32 LODIndex,
int32 UVChannelIndex,
const TMap < FVertexInstanceID , FVector2D > & TexCoords
)

What is FVertexInstanceID? Is it fixed ? how to convert PolyVertIndex to FVertexInstanceID?

Thanks.