Terrain LOD model algorithm
The LOD algorithm in terrain can be divided into: discontinuous LOD model, continuous LOD model and node LOD model.
Non-continuous LOD model: It essentially saves multiple copies of the original model, each copy corresponds to a specific resolution, and all copies form a pyramid model. The advantage of this model is that there is no need to generate a model online, and the visualization speed is fast; the disadvantage is that the data redundancy is large, which is easy to cause inconsistency of geometric data, and because there is no correlation between different resolutions, the conversion between different resolutions is easy to cause visual problems. jumping phenomenon.
Continuous LOD model: It is a model that only retains a certain resolution at a certain time. In practical applications, a certain algorithm is used to generate a model of another resolution in real time. The advantages and disadvantages of this model are just the opposite of the discontinuous LOD model, that is, the advantage is that there is no data redundancy, and the consistency of geometric data and visual continuity can be guaranteed; the disadvantage is that models with different resolutions need to be generated online, the algorithm design is complex, and the visual speed slow.
Node LOD model: itself a resolution structure. Models of different resolutions are connected by nodes, and corresponding parts are operated by activating the nodes. When all nodes are activated, it is essentially a full-resolution structure, which has the advantages of simple structure and convenient operation, and is suitable for expressing complex discontinuous volume model objects.
https://www.cnblogs.com/jiayongzhi/archive/2011/06/01/2067430.html Model lod algorithm implementationhttp
://www.cnblogs.com/fuckgiser/p/6500641.html cesiumLOD rendering principle