Messed up tangents - help needed

[Loginus]

Ive made this LoRes model in XSI, and after extracting tangent space normals I have ugly and inaccurate results. worlds space normals look allright, but I know I need tangent Nmap to make it work inside UE3.

I figured out that its because of my LoRes model having incorrect tangent coordinates, but I dont know what caused it and how to fix that. Im also quite sure that my UVs are done well.

I will appreciate any help, or any links to tutorials that show how to make it right.

http://img130.imageshack.us/img130/1364/gasbagtangentserrorsm.jpg

[JohNLA]

Cool character.
I do not use XSI so I can't help with that but can't you just export a Normal map from Zbrush?

[BigDaz]

If you're using the ultimapper, you can go into Advanced tab and "Adjust Tangents" which gives you the option to smooth things out. Which might help.

[Loginus]

http://img693.imageshack.us/img693/6936/errorri.jpg

Thanks for help, there is an improvement, but even though tangents seem to be smoothed out seams still persist.

[Loginus]

All right, another step forward...

Today I realised that Softimage is exporting my model with old tangent coordinates. I can smooth my tangents, everything looks well in the viewport, but when I export it (i tried .obj, .fbx and .dae) and import it back model wont be smoothed. Does anyone know what to do with it?