This option downloads a plugin for Google SketchUp that enables exporting SketchUp files to the Wavefront OBJ file format. The file can then be opened in ShadowFX for shadow analysis.

Many thanks to Jim Foltz the developer of this plugin.

To install the plugin:

• Move the downloaded file to the SketchUp plugins folder. This is typically
  "C:/Program Files/Google/Google SketchUp 7/Plugins".
   
• Restart SketchUp.
   
• Click on the SketchUp Plugins menu to use the plugin.