I am struggling here trying to create models for my Unity game in blender and finally succeeded creating a polygon shape by slicing off the corner of half a cube using a boolean modifier, then doing shift-D to duplicate the object, then mirror it across the x axis and join the 2 objects.
The 2 joined objects have slightly different colors for some reason but here is the object (with all its faces as it should be) in blender:
When I drag the .blend file into Unity it shows up however the side that is the mirrored object is missing some of its faces. This is a problem -
Why is this happening? Can I fix this?