Hi Everyone!
I’m new to UE4 and I have few problems with it. First, when I import my 3D model from Blender I recive a message ,Object has degenerate tangents…". I searched for a solution, but found nothing. Some walls have good shadows, else are black.
Second problem is when I import my model and add it to 3D view in UE4 some materials aren’t properly imported. They are blurred or don’t look like original materials from Blender.
Here are screenshots:
HI!
Message about degenerate tangents is not an error, and is just warning. And this usually happen, when your model not have UV map or UV map is not correct.
Before export, you need collapse all modifiers in stack, check normals and UVs on objects. Each object must have UV0 for texture and UV1 for Lightmap.
This is several tutorials about how to prepare models for export from Blender to UE4.
https://www.youtube.com/watch?v=mI7IA4d15AwThank You, that helped 
Now I have another question. I have two sided, static walls and stationary light behind it. In the corners this light pass through wall. I tried to edit mesh, checking options in UE4, but nothing worked.
Ok, now everything is fine, thank You
