Strange cloud reflections over a curved glass

[pproestos]

I have a building model with round balconies with

curved glasses.

My environment is an hdri cloud sky.

As I you see in the picture, where the curve is, the

clouds are showing like vertical lines.

Any clue if this an spline model problem or the

way that the glass reflects the sky?

The hdri is applied as environment map and

in the arnold settings I have enabled the specular

reflections in the backplate (source: scene environment) and

disabled them on IBL.

How can I fix it?

thx..

[pproestos]

As I noticed on various curved glass surfaces in real life, arnold simulates exactly the same effect. So I think it's normal this kind of reflection....