Hope it will help somebody, it took me two hours to figure it out, and it turned out to be an easy fix. If you are building a project for VR and you are following quickstart for Unity, it recommends you to set up Near value to 1 and the Far value to a large value, at least 100,000. However, if you set it up to one, your hands will disappear, but if you set it up to the smallest value of 0.01, then the whole terrain starts to jitter terribly. I found that value of 0.3 works best, that way you can see your hands and the terrain does not jitter. (also make sure to turn on anti-aliasing option inside XR Rig main camera settings)