Smoothing the keyhole part shows visible triangular seams

I want to smooth the keyhole bracket part and when I set the smooth shading, I clearly see the triangular geometry around the keyhole.

Here is the captures of what I see

On my screenshots, I havent added explicit sharped edges on the smoothed capture.


Below, the smoothed mesh


Did I've done anything wrong ? :/

  • spikeyxxx replied

    Try turning on Auto Smooth in the Object Data Properties (green 'triangle'):

  • veltarn replied

    Oh, well... problem solved... :)

    I activated it but brainlessely set it to 180 and  I just figured it out, by reading your answer, that if I set it higher than 60° I start to see seams.

    30 or 40° seems to be the good values, thanks you!