I have a problem with import smooth object from blender. It looks smooth and clean in blender but in UE4 some polygons looks strange. I tried different export fbx methods like smoothing face, tangent space but nothing helped.
The first picture shows the model with normal map in ue4, the second one in blender.
Any help on this matter would be greatly appreciated. Thanks!
Maybe try recalculating normals and increasing the angle threshold under Normals => Auto Smooth
Thanks for responding, unfortunately nothing changed 
The problem also occurs when there is no normal map applied so I think that it isn’t a normal map problem.
When Exporting in Blender FBX options> Geometry, set Smoothing to FACES and export again and see if that helps. I have seen something similar when exporting also because making in Blender using Quads, but when it is exported it is converted to Tri s. Depending on how your UVs are laid out, it could also be the lightmap UV. Maybe try increasing the light resolution in Unreal to see if it’s the Lightmap.
other suggestion: Add a triangulate modifier in Blender, then try exporting with Smoothing as Faces. (Unreal should make the lightmap automatically for you if you haven’t changed the setting under import settings for Unreal.)
Good Luck!
Hi CaveScholar, thanks for the advice. I finally found a problem - after applied Smart UV Project, there was some loose poligons in UV map, so I manually marked seams, unwraped and it solved the problem.
Nice! Sometimes polygons become self-aware (Ai) and go where they are not suppose to go 
