Shadow artifacts between touching meshes

Hi, I’m pretty new to UE4 and I’m trying to do a simple animation: a wall that separated in different pieces.

What I need is that at the start of the animation the wall should look like it’s just one piece (like the one on the left).

The problem is that when I put the pieces in position I’ve some bad shadow artifacts (red circle), even when they are not there you can see that the pieces are separated (green circle).

The unlit version works just fine:

Is something that is possibile to do in UE?

What I’m I doing wrong?

Note: I’ve already tried to change the light map resolution a various settings in the world properties as it was suggested in other discussion.

looks like it could be caused by smoothing, are all the pieces smooth shaded?, if they are you might want to try it with them flat shaded so the lighting is the same across the entire mesh, that would also explain why it looks ok in unlit mode.

thank you for the answer!

I’m exporting from blender 2.73a and the mesh are flat shaded: is there a way in UE to force flat shading in case this is an export problem?

I don’t think there is a way to force it however you shouldn’t need to. have you tried changing the “calculate normals” setting to “import normals” during import?, often fixes it.

I just tried Normal Import Method on “Import Normals” and on “Compute Normals”: but the result is the same…

well if your problem is caused by smoothing and changing the import settings did nothing it must be something at the blender side of things, so 2 questions, what version of blender are you using? and how are you exporting the smoothing?

I don’t know if it’s causing by smoothing group, anyway I’m using blender 2.73a with the export settings suggested in the twitch live streaming:

I just did a quick test using your settings and got the same result so I am pretty sure its a smoothing issue now:), I don’t have your file so I cant properly test it but in the test I just did setting smoothing to face in blenders export settings fixed it, give that a try and let me know if that works.

Thank you for the suggestion, I’ll try it and I’ll post my result!

Thank you! It works exactly as I need!

glad you got it sorted, looks good:)