There’re many famous software such as Maya, AutoCAD, Solid Work which can display the 3D model. Moreover, those software also support user to manipulate the 3D Model like Zoom, Move, Rotate the 3D model.
This source code show you how to read a 3D model file, display it on Window screen as well as manipulate it (Zoom, Move, Rotate) like those software.
We will develop a WPF Window Application (Window Presentation Framework) to display the 3D model file. The simple way to display 3D model is combining WPF with 3rd library (Helix Toolkit) http://helixtoolkit.codeplex.com/