Microsoft HoloLens Developer???s Guide

Testing for touch

In the DirectX sample, we skipped the part where we test for interaction with other objects. We will, however, do this in our Unity code.

To do this, we have to use ray casting. Ray casting is a technique that allows us to examine whether the cursor hits an object or not. Imagine a ray of light coming out of the HoloLens, right from between your eyes. It will move straight into the distance. The moment it hits something, it will return and then you know that there is something out there that might be of interest. This is exactly how this works.

We will update our Update() code in Visual Studio:

private void Update() {     if (cursor == null)         return;      var camTrans = Camera.main.transform;      RaycastHit raycastHit;   if (Physics.Raycast(new ...