i already read your entire blog + the link and your ideas in there, but somehow i can’t get rid of the darkened backfaces.
Adding a vector facing up (0,0,1) as a fixed Normal in the material editor (Tangent Space Normal disabled) is indeed a workaround, but prevents me still from using my custom normals which are slightly rotated.
I then tried to disabled “two sided” and created two faces for every side, just like Michal suggested in his blog.
With the double sided version, i added my material and the entire mesh was invisible. Strange error.
Getting pretty late here, so i have to try again tomorrow, thanks in advance and greetings from Bremerhaven