Adaptive lod model construction method based on face clustering

Abstract

The invention discloses a self-adaption LOD model establishing method based on face clustering and belongs to the field of three-dimensional digital urban and geographic information system. The data volume of an LOD model is decreased. Due to the fact that the simplified LOD model obtained by utilizing the self-adaption LOD model establishing method is a progressive load, each LOD is formed by the partial face of an original model, and vertex attribute disorder is not caused. The self-adaption LOD model establishing method is high in algorithm efficiency, can be used for real-time self-adaption to generate the LOD model and effectively prevents the LOD switching from being excessive and unnatural. Texture optimization is standardized according to texture resolution ratio.

Description

technical field [0001] The invention belongs to the field of three-dimensional digital cities and geographic information systems, and in particular relates to a method for constructing an LOD model. Background technique [0002] LOD (Levels of Detail) is a commonly used 3D model loading idea, and its core lies in generating a good LOD model and a loading strategy for the LOD model. A good model optimization result can improve rendering efficiency under the same loading model; and for the same model, a good loading mode can also improve rendering speed. [0003] Most of the existing architectural model simplification methods use free mesh-based simplification methods, which will cause deformation of the building during the process of deleting or merging surfaces, and the effect is not good; secondly, since architectural models are usually pasted with texture However, in most of the model simplification methods, the vertex attributes are not considered enough, and the simplif...

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Problems solved by technology

[0003] Most of the existing architectural model simplification methods use free mesh-based simplification methods, which will cause deformation of the building during the process of deleting or merging surfaces, and the effect is not good; secondly, since architectural models are usually pasted with texture In most of the model simplification methods, the vertex attributes are not considered enough, and the simplification method will cause confusion in texture map coordinates, resulting in texture map confusion, which greatly reduces the quality of model simplification

[0004] LOD models are not loaded efficiently

When many 3D platforms load massive model data, there are problems such as low model loading efficiency, insufficient switching between LOD models, and slow loading and rendering speeds, which affect the visual experience and further industry applications of the 3D platform. How to improve The dynamic throughput speed of the model and the problems that need to be solved to speed up the 3D rendering speed of large scenes

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