第四章主要阐述玉米类作物的根系的动态的三维几何形态建模，可视化方法。
Chapter four explains the dynamic modeling and visualization for root system of Crops.
本文介绍了虚拟现实技术及其在城市规划设计中的作用，并探讨了城市真三维建模与可视化管理。
This paper introduces VR technology and its function in city planning and design, and probes into city real 3D modelling and visualization management.
以某金属矿山的试验采场为例，结合DIMINE数字矿山软件，介绍了三维可视化建模技术在该矿山的应用。
Taking the experiment stope of a metal mine as example and combining with digital mine software DIMINE, application of 3d visualized modeling technology in this mine is introduced.
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