e0d_vec:norm(BT)}        end, VsTs0),     Data = wings_draw_setup:add_tangents(reverse(RevF0V), VsTs, Vs),     What = [vertices,face_normals,uvs],     Vab = wings_draw_setup:create_tangent_vab(What, Vs, Data,            FaceMap, MatInfo),     Pd#sp{vab=Vab}.  