基于连续细节层次的地表模型实时绘制算法

An Algorithm for Real-Time Rendering of Terrain Surface Based on Continuous Level of Detail

研究地表模型的实时绘制 ,提高绘制速度及可信度 .采用点到平均平面的误差度量和基于渐进网格的动态简化方法 ,使模型简化可随视点参数而动态变化 .为进一步提高绘制速度 ,算法中使用了条带结构 ,并对视区外的部分实现快速裁剪 .在 P 30 0上绘制速度可达 71ms/帧 ,绘制质量可接受 .点到平均平面的误差度量可以有效地提高动态简化的可信度 。

To investigate real time rendering of terrain surface, improve the speed of rendering and the fidelity of simplification, the algorithm taking the distance from vertex to average plane as the error metric and progressive meshes based dynamic simplification was used, which provided view dependent simplification of the model. The use of triangle strips and quickly culling faces outside the view frustum also contributed to fast rendering of terrain surface. On a PⅡ300 machine the algorithm achieved a speed of 71 ms per frame, and the rendering quality could be accepted. The error metric based on distance from vertex to average plane can produce high fidelity of dynamic simplification, and reduce the complex computation when rendering.