What Open Source Map SDK for Android with support for 3d layers do you know?

Question

Android

Problem:
We have our own online service that gives png tiles for display on the map. Our Android application accesses the service and renders tiles on the MapView. We set the task instead of 2d rectangles, to draw all the buildings in 3d . We will not have time to redraw the tiles (like Yandex :) before the deadline. Output? Software rendering of 3D primitives.
Search: Led
me to the Nutiteq SDK , which can draw polygons with height:

The picture fully describes what I need. From the main plus of the Nutiteq SDK, I highlight the ability to switch between map sources (the ability to connect your own map source). Main disadvantage: License ( https://developer.nutiteq.com/ ).
Bottom line:
Need help finding an SDK to display maps that can be loaded from a custom server, with the ability to draw 3D primitives by coordinates?