Curved edges look fragmented

[mankhes]

I didn’t have this problem before, but in my new project all the curved edges and objects look fragmented in the Vray render (and somehow in the shaded view too)

Vray Render:
.

Screen shot from the wireframe view :

I tried different methods to re-construct them, including rebuilding the curves and re-making the surfaces.

Has anyone had the similar issue?

Cheers

[Imai_Tomoya]

document properties > mesh
pick “smooth & slower” instead of “Jagged & Faster”.
or you can adjust how your surfaces are divided in “Custom” mode.