Research on integration of virtual reality and other library systems based on hierarchical model

Accessing to complex information structure is a prerequisite for functions of virtual reality system in actual production and digital libraries. The data from these complex pattern are often organized and stored by other systems. Therefore, virtual reality system must be integrated with them. In this paper, a hierarchical model is presented to solve the problem, which consists of genetic layer, organizational layer, feature layer and demo layer. Reconstruction method in virtual environment was proposed. The information in demo layer and organizational layer were constructed based on the additional data exported from other systems´ model. The link between genetic layer and organizational layer was established through a surface-polygon mapping mechanism. Using XML-based neural file and original model file, demo information and topology information contained in the model is transformed and reconstructed through mapping relations. The data sharing problem was presented and verified by integration of CAD and virtual assembly system.