I am quite new to Blender and need some help with a hopefully small problem.
I created a more or less complex mesh. The complete mesh is smoothed and some edges are marked as sharp with the edge split modifier.
In some faces there are kinks although the face is completely flat.
I recalculated the normals with no effect.
The hole was cut with the boolean modifier. It added some additional edges in the whole mesh. Mostly at the problematic regions. But the lines (shadow?) existed before also.
Thank you in advance!