Method for lightening three-dimensional model

Abstract

The invention relates to the technical field of three-dimensional models, and concretely relates to a method for lightening a three-dimensional model. Through filtering, compression, coding and display acceleration of original model data, while geometric and structural relations and attribute information of products can be completely described, the volume of a model file is reduced, the drawing speed is increased, three-dimensional model simplification considering texture maintenance is realized, and based on comprehensive method research of a three-dimensional model and a scene based on computer vision, a model topological structure relation and spatial coding scene pyramid establishment are kept, so the purpose of quickly displaying and interacting a three-dimensional model by fully utilizing limited computing power, rendering power and storage space of mobile equipment is achieved, a user can conveniently obtain product information anytime and anywhere, meanwhile, better appearance attributes and model details are reserved, and good model display capabilities such as clear textures and obvious features are achieved.

Description

technical field [0001] The invention relates to the technical field of three-dimensional models, in particular to a method for lightweighting three-dimensional models. Background technique [0002] As an important part of urban digital infrastructure, urban 3D models have a wide range of applications, such as urban planning, environmental monitoring, and spatial information analysis. With the continuous development of digital cities and new surveying and mapping technologies, the accuracy of 3D models obtained is getting higher and higher. The display of these 3D models requires higher hardware performance such as computing performance, physical storage space, memory space, and GPU rendering capabilities. For a long time, it can only be carried out by personal computers with better hardware conditions. [0003] The mobility and portability of personal computers are poor, and without the help of computers, it is difficult for relevant personnel to use 3D models for large-sca...

AI Technical Summary

Problems solved by technology

[0003] The mobility and portability of personal computers are poor, and without the help of computers, it is difficult for relevant personnel to use 3D models for large-scale display and in-depth analysis, which affects the flexibility of model use and reduces production efficiency

However, the penetration rate of mobile devices represented by tablets, PDAs, and smart phones is getting higher and higher. Mobile devices generally have disadvantages such as low computing performance, small screen size, low rendering capabilities, and limited memory bandwidth and capacity. The complex structure of the product model and the large amount of data have contradictions that are difficult to reconcile, making it difficult to directly and quickly display the original 3D product model on the mobile device

[0004] The traditionally generated lightweight model changes the topology of the original model, and the Gregory surface expression form is not compatible with other existing 3D systems. The operation of the model can only be realized by using this specific secondary development interface, which limits its scope of use. ; When considering texture simplification, the semantic information associated with the geometric objects of the building is not considered, which is likely to weaken the final visualization effect; The model features are lost; the texture is directly merged, although the number of textures is reduced, but the texture size is either large or blurred; the appearance attribute information is used to separate the high-frequency part of the model, reducing the loss of information in the detail area , so that the geometric details and appearance properties of the model are well maintained while maintaining the model outline, but the spatial relationship is lost during the actual analysis of the 3D model with high precision requirements

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