IMDF Indoor Map enable 3D effect instead of flat surface

I am playing around with IMDF. However I am experimenting with 3D effect of the building (walls etc.). With official maps app we can achieve this effect easily by panning the camera in an angle between 89° and 45° like so:

Now I tried to achieve this by enabling pitch gesture

self.mapView.isPitchEnabled = true
to the example app for IMDF but the result is only a flat surface.

Now I tried to enable buildings

self.mapView.showsBuildings = true
, because I thought enabling buildings could trigger some function to render IMDF-Data to 3D, but the result was disappointing.

As we can see the IMDF-Data renders only some kind of overlay to the map. Looking to the documentation of IMDF, airport indoor maps are also done with IMDF, so where is the trick? Is it even possible to get the 3D-effect as a private developer?

Still no answer... Asked the same question to imdfquestions@apple.com, but no answer either.

IMDF Indoor Map enable 3D effect instead of flat surface
 
 
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