First I try to modify float number in GetSkeletalMeshComponent()->GetSkeletalMeshResource()->LODModels[0].VertexBufferGPUSkin.GetVertexPtr(i)->Position,And after i really change them nothing happen to the mesh(it looks like before).
Then I try to modify GetSkeletalMeshComponent()->GetSkeletalMeshResource()->LODModels[0].Sections[0].SoftVertices , but it is a const value So i have no ideas .