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Exported texture distortion in Mudbox

Hi!

I'm having an issue where my textures (normals being the biggest issue) get distorted when I try to export from mudbox.

Here is the problem and how I have tried to solve it. I tried to gather all the possible information that might be useful, I hope the pictures make sense.

Lowpoly mesh and its UVs (all separated edges are hard, others soft):
8260330337_188b296894_b.jpg8260333059_6545daa704_b.jpg

Sculpted in mudbox:

8260330547_75cffc1879_b.jpg

Extracted normal map, very distorted:

8261399120_24ebf0f606_b.jpg

Same thing happens if I try to extract ao:

8261399286_7ac25919b2_b.jpg


The problem is already visible in Mudbox with those textures applied:

8260330779_2ecd1ec038_b.jpg

I read about waviness in normal maps, and thought that more geometry might fix the issue. So I made another arch from the beginning:

8260330097_100e198df6_z.jpg8260330165_5e470144fb_b.jpg

8261415452_55aea03f56_b.jpg

The problem is less visible, but still definitely there:

8260329633_ed7028abbd_b.jpg8261440688_da7e49444e_b.jpg

I also tried what happens if I rearrange the UVs so that the underside is attached to the front:

8260329741_4a0d1be372_b.jpg8261398274_61978e7b96_b.jpg8261398352_2cc8a9dae9_b.jpg

Problem remains:

8260330005_a75e3169a2_b.jpg

Here are the settings I normally use. I have tried using subdivision and changing the search distance, but the same thing happens.

8261398034_6e4ec140d9_b.jpg

I have tried this in Mudbox 2011, 2012 and 2013 on three different computers without any luck.

I have been looking all over for a solution to this problem, but haven't found anything yet. I would greatly appreciate any ideas you might have to fix it.
I don't mind redoing the work from the beginning, but even that doesn't seem to be helping at the moment.

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