METHOD FOR CONSTRUCTING A DECOMPOSITION DATA STRUCTURE OF MULTIPLE LEVELS OF DETAIL DESIGN FEATURE OF 3D CAD MODEL AND STREAMING THEREOF

摘要

A method for streaming multi-LOD design feature of a 3D-CAD model comprises defining a LOD of a 3D-CAD model with each design feature of the 3D-CAD model, wherein the design feature is the smallest 3D-CAD model constructing unit; constructing the LOD of the 3D-CAD model into a decomposition data structure of LOD design feature recording each design feature of the 3D-CAD model in different LODs, wherein the LOD comprises all unit assembly faces of the design features; constructing a switch face display mechanism controlling whether each design feature of the 3D-CAD model is displayed; and encapsulating a designated design feature into a packet based on users' configuration and transmitting the packet. The invention achieves multi-tier real-time incremental streaming transmission and implements streaming transmission into point-to-point information sharing for collaborative participants to receive information from others to obtain higher level information and share information to others for integrated information sharing efficiency.