Normals in game mode on a linked-copy mirrored mesh

I am having a problem with linked-copy mesh that has been mirrored in object mode. The normals are all facing the correct direction and in potate mode my uv-map looks right, but as soon as I press p the faces flip and become invisible (just like if the normals were facing the wrong direction). Any ideas?

Make it real mesh and recalculate its normals.

I had that problem. Only way to fix it is to flip all the normals, or unmirror it in object mode and use mirror in edit mode. Because I like to keep thins consistent, I don’t mirror anything in object mode, but that’s just my preference, because normals that appear right/wrong in the edit window appear wrong/right in the game…

Please look that:

Maybe it is helpfull. :wink: