I try to create a project in Unity to place an 3D model on a surface.
The hologram locate correctly but when I come close to it, it seems jittering.
I am using Unity 2017.2.0f3 and Vuforia.
Any ideas how to resolve it?
Try upgrading to Unity 2017.3. I believe 2017.2 has a stabilization bug that causes the jitter.
That's because of a bug in unity that is now fixed in 2018.1 and backported to Unity versions 2018.1.0b7, 2017.3.1p1 and 2017.2.2p1.
Importantly, 2017.2.2p1 seems to works okay (for me so far) with the dev version of Mixed Reality Toolkit.
Note that there exist two different stabilization bugs. The one mentioned above should be fixed and was the most severe.
This one still exists and could use some community votes: