Enabling Spatial Data on HoloLens

To be able to work with spatial data you ill have to set some build settings in Unity.

First of all, we have to set using of 16-bit depth  buffers. in the Player Settings | Other Settings. Additionally Windows Holographic have to be enabled too, but this is probably already the case.

As next, set SpatialPerception in Player Settings | Capabilities.

Only if these settings are enable. SurfaceObserver will obtain data from real world and fire OnSurfaceChanged event.

SurfaceObserver  bserver.Update(SurfaceObserver_OnSurfaceChanged),

which holds implementation for rendering of mesh data.