With [b]Multisample anti-aliasing (MSAA)[/b], Assetto Corsa calculates color of pixel not once, but several times, in several points, and averages results. This way, image has more details, but, to save performance, it only works on the edges. That’s why, although it nicely smooths shapes, it doesn’t help with reflections and speculars. You can use post-processing AA, such as FXAA, for that.