How much is your virtual environment worth? Considering economical requests in online 3D-worlds

While for 2D Web sites there are means to evaluate user navigation from page to page and thus rate a sites value, there is nothing like that available for 3D environments. The user tracing approach described here provides information about users´ navigation and interaction in 3D environments which can be utilized to rate a 3D Web site´s value and also enhance the usability of the overall site. All information is collected on the client and then transferred to the server to be available for later evaluation.