The Research On The Real-time Rendering Technology Of Large-scale Terrain Model

The real-time rendering technique of large-scale terrain has been a pop research field in Computer Graphics. The huge data quantity limits the rendering velocity of the terrain. How to organize and simplify effectively the terrain data is the urgent problem to solve in the field.The paper aims at the present research of the terrain real-time rendering, focuses on the following several problems: large-scale terrain simplification, multi-resolution representation and the data schedule. Comprehensively considering the three parts: the terrain model 's static simplification, the data pre-fetch based on sub-block, the dynamic model based on view-dependent, the paper simplifies the model of the large-scale terrain, realizes the real-time rendering of the terrain model. The research results are as follows:(1) The author proposed the smooth degree of the terrain, depending on the smooth degree of the terrain; the algorithm simplifies the terrain model based on the adaptive quad-tree. The paper uses the simplified-model to replace the original model.(2) The author proposed the data pre-fetch based on sub-block. Depending on the viewpoint's move, we input the terrain nodes in advance on the direction of the sight line and probably into the range of the view in the next scene.(3) The paper improves the algorithm to produce the dynamic model, depending on the cut of view-frustum and the judgement of dynamic error, we can make sure the node and its level of detail, then we can split or combine the vertex of the node in memory correctly and render the terrain.The experiment result indicates: the algorithm can effectively improve the rendering velocity; basically satisfy the real-time rendering of terrain.