Well, instead of describing the problem i've decided to record a short video, demonstrating the problem:
I've no idea what it is but it's very annoying. This glitch happens not only when i look at stairs, but also with some LOD objects and lattice objects (sometimes with fences too). Any ideas how to fix it?
Also, a screenshot, demosntrating the same thing (at the ark around the tree):
Edited by Iolya, 25 August 2017 - 06:44 PM.