How can I keep a logo applied to an object, say a sphere, from repeating a mirror image of itself on the opposite side. Its a simple pepsi graphic created in PhotoShop with an alpha channel and applied to a layered shader. I get a nice sized and positioned emblem on the spheres surface, after planar mapping, but get a mirrored version on the opposite side. Being new to this, I know it must be something very simple. Thanks in advance for any help.