Fine-grained Web3D online visualization method for large-scale building scene

Abstract

The invention discloses a fine-grained Web3D online visualization method for a large-scale building scene, and the method comprises the steps: firstly, carrying out the lightweight preprocessing in a model-level fine-grained mode and a file-level fine-grained mode in a BIM model lightweight preprocessing stage; secondly, in the network end pre-rendering and transmission scheduling processing flow, including loading preprocessing, optimal initial viewpoint selection, visual increment list calculation, interestingness calculation, file packaging and the like; and finally, in a Web end multi-thread asynchronous loading and rendering process, firstly performing incremental downloading on visual component data in a scene through multiple threads, performing online efficient analysis on a file package by using a WebAssembly technology, then performing instantiation rendering by using reuse information of the component, and performing component loading and removal management by using a cache scheduling mechanism based on interestingness. Through the process processing, a set of progressive lightweight online visualization solution for a large-scale BIM scene is completely realized.

Description

technical field [0001] The invention relates to the technical field of three-dimensional modeling and rendering, in particular to a fine-grained Web3D online visualization method for large-scale architectural scenes. Background technique [0002] Today, the "Internet +" technology is becoming more and more mature, and the "VR+" technology is beginning to rise. The demand for online display of 3D virtual scenes on mobile web browsers has emerged, and the online visualization of large-scale Web3D scenes has become more and more popular. For the field of construction, with the building informatization, Building Information Model (BIM) has become the mainstream technology in the development of construction and civil engineering informatization. The integration of BIM and Web3D visualization for mobile Internet has become an important research and application direction. [0003] However, the architectural model data is often very large, showing an explosive growth trend in recen...

AI Technical Summary

Problems solved by technology

[0004] (1) The contradiction between real-time transmission of large-scale building model data and limited network bandwidth;

[0005] (2) The contradiction between online rendering of large-scale architectural models and the low computing performance of browsers;

[0006] (3) The contradiction between the high delay caused by large-scale architectural scene loading and rendering and the limited patience of browsing users;

[0009] The patent "Lightweight BIM Big Data Online Visualization Method and System (Patent Application No. 201611102784.4)" provides an effective online visualization solution for BIM scenes, which is of great value in the lightweight deduplication of architectural scenes and the processing of building blocks. However, it has not given in-depth consideration to network progressive transmission scheduling (especially the initial loading and rendering is very important to user experience) and web page parsing / rendering / caching, and has not yet realized the online visualization of large-scale city-level BIM scenes.

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