Flywheel incorporates BrainBrowser to visualize brain surface objects. Use this viewer when viewing files with the .obj extension.
BrainBrowser is a JavaScript library allowing for web-based, 2D and 3D visualization of neurological data. BrainBrowser uses open web-standard technologies such as HTML5, CSS, JavaScript and WebGL. The Surface Viewer uses three .js for 3D rendering.
For more information about BrainBrowser, visit the official site.