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Annotations
Annotations are useful to place information on a 3d model. This shows how to add them in Blender.
As an example, we are using the Sanaa building from the Zollverein in Essen.
First step is adding an Empty. An empty is a single coordinate point with no additional geometry, this is useful for a number of things where geometry is not needed. Use Shift + A to add an empty.
The empty will appear on the origin, in this case on the center, under the building.
Use the G key (as well as X,Y,Z) to move it to the required position.