Improved methods for designing the route of a transport element, such as a tube, are provided. A method preferably designs the route automatically and, by utilizing constraint objects, including at least one adaptively-sampled distance field (adaptive distance field or ADF) constraint object, in the...http://www.google.com.tw/patents/US7668700?utm_source=gb-gplus-share專利 US7668700 - Adaptive distance field constraint for designing a route for a transport element
