Unfortunately, even this Riptide didnt help. I was thinking that it got better, but as soon as i apply a material to the walls, i have the strange triangle in those. i tried to cut the polys first into more smaller ones, that made it even worse!
Could this be a scaling issue? I am so confused...?! I dont believe its throught to the normals direction or so, the normals look fine-- could this may be due to the case that the polys are not "Closed"?

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