The error metric based on roughness

The error metric determines the number of triangles per frame, and affects the fidelity of terrain and efficiency of the algorithm in real-time rendering in dynamic terrain visualization. The screen error calculation method requires a lot of maintenance work and produces a large number of redundant triangles to eliminate T-junction and crack in the real-time rendering. So this will reduce the speed of real-time rendering of terrain. In this paper, using the local roughness factor constraint nested sphere of error metric can better reflect the details of local topography, while reducing redundancy triangle in flat region. And take advantage of the delay estimate frame coherence to reduce the computation and further improve the efficiency of the algorithm. Experiments demonstrate that the dynamic terrain visualization algorithm, using the error metric with constraints, can effectively reduce the redundant triangles and represents the deformed region very well in real-time rendering.