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Weird Sine wave in symmetrical normal maps.

ghastlycomicghastlycomic Posts: 2,531
in The Commons

I have a mesh that is symmetrical and the UV map unwraps down the middle and is mirrored and overlapped so that the texture maps only have to be one half the figure and it is mirrored to the other half.

Daz Studio applies the Diffuse map correctly, mirroring it to the other side without distortion but the normal map produces a weird sine wave right along the UV seam in the middle. Any idea why DS is doing this and how to fix it? Is this a bug or is there a setting I need to modify?

Weird Normal Symmetry.jpg
2000 x 1119 - 205K

Comments

  • mjc1016mjc1016 Posts: 15,001

    What did you use to create the normal map?

    How much 'padding' is there along the edges?

     

  • ghastlycomicghastlycomic Posts: 2,531
    mjc1016 said:

    What did you use to create the normal map?

    How much 'padding' is there along the edges?

     

    The normals were made in CD-Coat using Maya/Blender normals. There's 5 or 10 pixel padding I can't remember which.

  • mjc1016mjc1016 Posts: 15,001

    I usually use about 6...but have noticed odd things with less than that. 

    It looks like a classic interferrence pattern, basically the edges are equal and opposite (the opposite could be from flipping across the seam).  It would be more work, but you could try pulling the map into an image editor and either selectively blurring, just the padded area or masking it (that may lead to a sharp seam, though...so I'd try a little blur first).

  • ghastlycomicghastlycomic Posts: 2,531

    Increasing the padding and blurring it didn't seem to help.

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