I create a mesh in Houdini and bake it into unreal called MeshA and I use python to set it to MeshB’s lod1，2. Then I right click MeshB and use Asset Actions ->Export to export it to FBX.I √ [Vertex Color] and [Level Of Detail] when export.Finally I open this fbx with File node in Houdini and find the lod1,2’s Cd on vertex are all black(0,0,0)