Google Sketchup

Google earth is also very easy to use and compose 3D models. If you compare it to other 3D modeling software's such as Maya, Google Earth uses a more physical approach rather than a technical approach. I learnt that if you wish to create models for Google Earth you simply place an image from Google Earth's virtual world into Sketchup an then you model the 3D model on the image as a reference. Once you have finished your 3D model you can submit it for other users to view. 

The three images is one