| The difficulty of terrain rendering is main about to show the user real terrain, and to ensure that to achieve real-time frame rate(at least 25FPS).After reading the height information from the height map, if you render the terrain directly without any other treatment, this approach will difficult to achieve real-time simulation results when rendering large-scale terrain. Lots of terrain rendering technology is used based on LOD (Level of Detail) algorithm to simplify the terrain resolution, and enhancing the terrain simulation frame rate. And the realistic simulation of the surface vegetation is depending on the changes in surface height and color in expression.For the characteristics of topography simulation, this paper focuses on the dynamic terrain real-time rendering in large-scale outdoor scenes in real-time, and combines the scene management of graphics engine to manage the terrain scheduling. The dynamic topography which the paper studied is different from the past ones, the concept of LOD terrain which we studied usually means algorithm is based on camera distance and terrain from the surface of their own ups and downs, to reduce the number of vertices which GPU handles for from the efficiency. The paper studied the dynamic topography is based on the geometric objects creating for their role in deformation and color changes.Algorithm based on GPU , in this way, CPU can be calculated from the liberation of complex graphics. And GPU and CPU can process data paralleled. And using the latest GPU technology can facilitate efficient implementation pixel-level algorithms.To enable dynamic terrain better to go into practice in this paper, studying on the basis of the current mainstream of the engine, and independently designed graphics engine which include rendering management, scene management, I/O control functions. And the dynamic terrain algorithm will be embedded in the scene manage model perfectly, so it can be easily updated and replaced. |
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