Texture: how to map it to a bending cylinder

[Gaieus]

Well, this question is just "right at the perfect time". There's a new plugin called UV Toolkit with which you can easily do this although you'll ne3ed "special" textures for this as it will stretch the whole texture onto the individual facets of a curved structure.

If you look at my post there (second in the topic) and my second, tubular arch there, first, before I rotated the texture, the stripes ran "lengthwise", nicely following the curve.

Of course, it is not desirable with a brick arch but is with your grain example. It's just a matter of segments in the curve to be nice.