I’m new to Blender and have 2 problems with imported Blender objects in Unity.
First problem:
Depending on the angle parts of the pipe are invisible.
Second problem:
When I am using a texture in Unity the Blender object is not adopting the texture.
so either you use a double-sided shader (expensive) or you duplicate your mesh and flip the normals or simply cap it off on the ends, this really depends on what you need
2.most likely your mesh lacks uvs, or the uv layout of the mesh is small and inside a complete green area
good thing is, these problems are not rtelated to blender or unity, but rather lack of knowledge, so here you go :
http://wiki.polycount.com/wiki/Uv
http://frostsoft.blogspot.de/2012/01/what-are-vertex-normals.html
Tip for #1:
