First,i place two box in the scene,and covert them to a static mesh.
when a put a Material on this mesh,the line come out.
I need some help
thats partially because they where two boxes, so their UV’s dont match.
2nd, its better to make meshes in a 3d program like blender, 3dsmax, maya, modo, etc… ue4 isnt really suited to make 3d models/meshes.