Blender: Duplicate-Mirror-Join issue

[Shimoo_]

Hi,

I'm trying to do the following in blender:
I import a .pie file of one of the cyborgs weapons, ( e.g., the light cannon ). I want to make a dual cannon cyborg, so I duplicate the cannon mesh ( except connectors and the "empty" thing ) mirror it and then join. The problem is, when I join the meshes, the normals of the faces of one of the two are inverted, the textures are facing inside, not outside. Anyone knows how to do this without messing texture orientation?

[milo christiansen]

You can select all inverted faces and in one of the menus is somthing like "reverse vertice order", I dont remember which one

[Jorzi]

hotkey ctrl+N in editmode recalculates normals

EDIT: removing doubles first is also a good idea, the blender 2.49 pie importer doesn't join adjacent faces automatically, but creates separate vertices for each face.

[Shimoo_]

Ctrl+N worked! Thank you. Now back to twin weapon cyborgs work.