@remrem, how do you set the value of the angle? I don't see this data
@flegendre, yes I was doing that as well but I would like to simplify it as much as possible because my files will be very numerous and I must be able to see the hatching, so I can neither remove material, nor fiare levels of detail
@remrem, I adapted your solution with an image that I created from Word. Thus I was able to assign hatching to my image.
On the other hand, I can't control the angle of my image. Well I can do it manually but I would have liked to block this angle on the diagonal of my rectangle whatever its size (see below):