The third dimension is a growing topic at OSM. It's already possible to add detailed buildings and a lot of minor objects, which results in a 'feeling like home'.
If you just want to browse 3D city models, you can view them with multiple tools:
|Connectivity||Type||OSM Wiki Link||External Link||Description|
|Offline||Application||Kendzi3d||Website||3D Renderer part of JOSM Map editor|
|Online||Web Application||F4 Map||Map||WebGL realtime render - with fountains, trees, meteo, shadows based on real sun/moon position|
|Online||Web Application||MapSurfer||Website Github Map||only building heights|
|Online||Web Application||MapBox||Website Map|
|Online||Web Application||Open Earth View||Map|
|Online||Web Application||OpenScienceMap||Website Map||WebGL viewer using pre-calculated 3D building tiles - also works on Android and desktop|
|Online||Web Application||OSM go||Map|
|Online||Web Application (Java)||OSM-3D.org||Map||only building heights|
|Online||Web Application||WikiMiniAtlas||Map||Integrated in Wikipedia.|
|Online||Web Application||ViziCities||Website Map||WebGL dynamic OpenStreetMap visualisation platform + live transport and data overlays|
|Online||Mobile Application||OSG-Maps||Android (Play Store)||for Android|
|Online||Mobile Application||MAPS.ME||Website iOS (iTunes) Android (Play Store)||for Android/iOS|
Quick access to demonstration areas are also available on the Simple 3D Buildings page. A similar list of map applications can be found on Simple 3D buildings page.
For artists, it might be interesting to get city models in common 3D formats as .OBJ
The process of detailed recording your environment for later modelling is called micromapping in general. To get a lot of details very quickly, the Photomapping technique is recommend.
Instead of taking your own photos (from top of tall buildings), you can watch for your area at Wikipedia Commons or ask e.g. Wireless Community networks. Some further image services, which are worth to check:
To enter the data of your city, you can use OSM itself, or use an external storage.
Additional list of 3D tagging applications can be found on Simple 3D buildings page.
You are interested in embedding 3D functionality in your own software?
- Template:User 3d - if you like 3D and want to show it on your wiki userpage