black edges scatter around my imported mesh I have recently imported my new base mesh for my model from maya. I tried to apply materials but even with the default mat, i could still see through my mesh. this happened with several quads around my model. i went on edit mode in blender and checked the mesh and i saw these unusual black edges in the areas the issue happened. i have no idea how to fix this, i just assume that my mesh has some problems with normal faces. last time i checked my mesh didnt have any overlapping verts or edges. Please help me resolve this problem.


Here's the mesh i just uploaded to blenderexchange:
The black edges are normal edges, while all teal edges have the sharp flag set. So just select all edges, and open the edge menu with Ctrl+E. Select Clear Sharp, or Mark Sharp, depending of what you try to achieve.