Abstract: This paper presents a novel method for representing a scene with continuous hierarchical levels of detail,and organizing the scene into sub-regions according to the view points by what is called cel-l front. A cel-l front is a scene graph node list that can rightly meet the screen space error bound within a view region.Then the disk layout of the out-of-core geometry model is redesigned.In run-time,the mult-i threaded technique is used.The rendering thread constructs the cel-l front for the current view cell and renders the geometries through visibility culling and view-dependent refinement.The prefetch thread employs a regionbased prefetch strategy,to control the data prefetch based on the difference between neighboring cells’cel-l front.The algorithm can perform interactive out-of-core rendering for large-scale complex environments on commodity PC with fine image quality.