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Hello fellow 3D engineers, at the moment I'm working on a replacment of our old 3D system (was a plugin). I am using babylon for this and I am really impressed so far. The work flows easily through the hands. So I have a small problem, might be a really small one. We have a costumizeable pavillon. I build the Roof construction for one side of the roof. (it has a repeating triangular form). Then merged the mesh, created six instances and rotated them around the center to place them properbly. The main work is finished (calculation and boolean subtractions). Now I just want to polish the scene with shadows etc. I have already read what to do to sovle the problem with self shadowing (bias value). But what I see now is that the roof parts a illuminated the wrong for me. Please look at the screenshot. Is this right? It looks wrong. I can't say whether this is a bug or I am doing something wrong. Thanks for any help and best regards Kevin