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XSI Tangent Problems

Got massive problems with my lowpoly mesh with the tangents for normal mapping.
On the symmetry cut, with separat uv's for every half, the normalmap flip the direction. With color to vertex this problem are solved but the result are not the same.

So the only solution that i found: cut one half, freeze, symmetry and readjust the uv's from one half.
But this ****

Normalmap creation tested with: xsi and xnormal.

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