Quote - But it's only with the diffuse_color node. 
Alternate_diffuse renders just fine... There's apparently something else going on here.

 

Its only with double sided polys. Alternate_diffuse is processed in a diffrent way so it's not really a suprise that it looks diffrent.

apply a specular in the alternate_specular and it has the dashes too. a bit more subtle but still there.

Normals_forward seems to work if your not using alternate_ settings.

Pluging a simple color into the displacement and setting it really low (0.0001 or so) seems to fix it every time.

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