I have a on_mesh object,and I find the mesh’s m_V .Count is not zero,but the m_T.Count is zero.
How can I get the uv coord of this mesh

I find a functon ON_Mesh::SetTextureCoordinates,I will try this funciton myself

after I call SetTextureCoordinates function ,the on_mesh::m_V.Count will become big then before,Is it right ?

Yes, ON_Mesh::SetTextureCoordinates is a texture mapping function you can use to set the m_T[] values.