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随着网上三维虚拟场景的急剧扩张,来自用户端的即时下载请求和有限带宽之间的矛盾亦变得日益突出。现已有大量研究者致力于通过“渐进式传输”来实现网上大规模虚拟场景的快速下载,因此有必要对现有研究成果进行综述。首先介绍了渐进式传输的基本原理和过程,给出了一个用于评价不同传输策略的公式,接下来分别从(1)潜在可视场景集及潜在可视场景集增量的判定,(2)三维物体模型的简化技术和流式编码,(3)不同体系结构的分布式虚拟环境中的场景传输机制,(4)虚拟场景的预下载策略等方面论述了针对大规模虚拟场景的渐进式传输策略,最后展望了网上大规模虚拟场景渐进式下载技术的未来研究方向。
With the drastic expansion of the online 3D virtual scene, the contradiction between the instant download request from the client and the limited bandwidth has also become increasingly prominent. Now a large number of researchers are dedicated to the rapid downloading of large-scale online virtual scenes through “Progressive Transfer”. Therefore, it is necessary to review the existing research results. First of all, the basic principle and process of incremental transmission are introduced. A formula for evaluating different transmission strategies is given. Then from the following aspects: (1) the judgment of potential visual scene sets and potential visual scene sets increments, (2 ) Three-dimensional object model simplification techniques and streaming coding, (3) different architectures in distributed virtual environment scene transfer mechanism, (4) virtual scene pre-download strategy and so on for large-scale virtual scene of the progressive Transmission strategy, and finally prospects the future research direction of gradual download technology of online large-scale virtual scene.