I get this where I have mirorred uv's and accidentally welded everything together
if you haven't welded anything ans its still happening, you can change the 'w' value to 1 on one of the uv shells. ie they lie on top of each other, but one is separated by the w value.
when this happens in maya you make sure no UVs are on top of each other so you take the mirrored UVs and take them out of the 0-1 uv space and then bake!
Ruz, SaferDan- Thanks for the help, it now works perfectly. I had already welded the objects so I had to go into edit poly and select one half of the object and apply its own uvw unwrap. In the uvw editor I moved the uvs slightly to the left. I then applied the projection modifier and now it works.
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Here is the max file if anyone has the time to check it out for me.
http://eelmonkey.com/lowandhighpoly02.7z
Thanks
if you haven't welded anything ans its still happening, you can change the 'w' value to 1 on one of the uv shells. ie they lie on top of each other, but one is separated by the w value.