Ah nevermind I know exactly what you mean. I should have played more with triangulating my normals. But I honestly can't bother arse to re-edit a whole construction set only because I decided to extrude a window or door rather then model them singularly and add them as elements.
Since whatever is imported on mdl loses smoothing groups and only just 1 big smoothing group is created, those artefacts are generated. I tried detaching faces to fix it.. but in the end the shade-c shader even makes it worse then my previous screenshot.
I can only think of a solution which is adding dynamic lights here and there to HIDE those artefacts.
But the dyn lights in shade-c 0.91 beta s1 don't seem to work. Very strange!