To measure distances and determine point positions, open the Measurements window by using the Menu → Measurements option.

If the model is georeferenced, then GPS coordinates are shown in the selected spatial reference system, as well as altitude, and distances are indicated in meters; otherwise distances and positions will be relative to the spatial reference system of the 3D model.

You can change the spatial reference system by clicking on the Measurements window options, and by choosing “Reference System …” (see screenshot below).