finally the textures have nothing to do with this problem. I noticed the AO node changes some things…
Also, i moved the mesh away from the place it is and i noticed this problem disappears.
And playing with various things, showed it looks like some normal interpolation problem
tied to sharp edges…
an of course it appears on my baked AO map
Mebe it comes from my blender prefs ? or from my machine ? ( graphic drivers )
i gonna try this blend on another machine just to see.
EDIT: well bad news this happens on my other machine !
i tried to open the file with blender 2.79b and the problem disappears ( but 2.79b
don’t have the AO node that i need… )
therefore it appears to be some kind of bug in the 2.79 up to date builds.
maybe i should file a bug report ?
here’s a simplified version of the file, with simple nodes material and no textures.
bug.blend (1.2 MB)
please could someone try to open it with the blender-2.79.0-git.001414fb2f73-windows64 located here: https://builder.blender.org/download/blender-2.79-001414fb2f73-win64.zip
and confirm me the problem exists ?
thanks in advance