In recent years, with the rising of virtual reality and distributed interactive simulation, many researches focus on collision detection, and exact collision detection is very important to improve reality and enhance immersion for virtual environment, however, the complexity of virtual environment especially the large scale complex environment brings higher requirement to collision det.

The fast rendering technique for large-scale and complex scenes is the basis of many important applications such as virtual reality,real-time simulation,3D interactive design,and so on.

The fast rendering for large-scale and complex scenes is the basis of many important application such as virtual reality,real-time simulation,and so on.

By the analysis to the complex scene,a double-layer visibility culling algorithm is proposed,and the algorithm combines view frustum culling,detail culling and occlusion culling methods.

Some key technologies are discussed,such as the modeling and optimizing of cosmically and complex scene,scene database optimizing,the showing and optimizing of CAD models,the optimizing of data structures.

The complex scene of the block scheduling strategy and its improvement programme are discussed,and it is applyed to "the virtual training system of station" ,soluted the "jump flash" phenomenon in the block scheduling strategy.

For mass dataset terrain, the contradiction between the finite process ability of hardware and the increasing mass dataset in flight simulation was solved by adopting to schedule them in blocks and revise them real time.