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I need this option enabled to display some models properly.

Blender 2.7 - Image Mapping

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It's possible to calculate mirroring UV coordinates by creating a sawtooth shaped graph.

Desmos Graph

Here is it implemented with nodes for cycles and EEVEE. Since modulus is behaving in a different way below zero, the Fract operation is a better choice, but then we also need to scale the value to the 0 - 1 range.

Implementation with nodes

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  • $\begingroup$ surprised to see that it doesn't seem to work below zero - the absolute node removes the negative values. $\endgroup$ – sambler Jun 15 '19 at 6:41
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    $\begingroup$ Nope, this is why: en.wikipedia.org/wiki/Modulo_operation#Common_pitfalls $\endgroup$ – Jackdaw Jun 15 '19 at 21:35
  • $\begingroup$ @Anthony, please use a proper file service and remove the link to that horrible site. $\endgroup$ – Jackdaw Jul 16 '19 at 22:35
  • $\begingroup$ @Anthony for sharing Blende files please prefer Blend Exchange instead $\endgroup$ – Duarte Farrajota Ramos Jul 16 '19 at 23:51
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    $\begingroup$ @Anthony, I have updated my answer so that it will work below zero, now there shouldn't be any problems to use it with your model. $\endgroup$ – Jackdaw Jul 17 '19 at 16:09

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