Partial Instance Technology Based on Level of Detail

In this thesis, taking Guishan Han tomb 3D Visualization Simulation System as an example, partial instance technology based on level of detail (PIT-LOD) is studied. The 'rea-listic' and 'real time' of VR system could be reached at the same time by combining these two approaches together. Based on study of level of detail (LOD) and instance technology, the PIT-LOD is further discussed. Firstly, objects in scene are classified according to its physical position, then, several models are developed for these classes by means of level of detail, after that, those models are simplified, finally, objects of same class in other positions are relocated through matrix transformation. After applying the PIT-LOD in Guishan Han tomb 3D Visualization Simulation System, the jump problem in LOD is resolved in some extent and the time spend on matrix transformation time in Instance Technology is reduced. So, the PIT-LOD can improve the 'real time' and 'realistic' of the VR system.