Abstract: This paper analyzes the problems in modeling linear 3D features and loading linear 3D model to 3D platform software, and proposes a method to use small units combination to parametrically customize linear features and load linear 3D model. This method takes the space coordinates of linear features as parameter, and models the 3D model small units as the element according to the need. The location, posture and scaling of the element are key parameters. This paper gives the key parameters’ calculation. According to this, the elements are combined as linear 3D model and loaded into 3D platform software. This method parametrically customizes linear features, simplifies the workload of modeling linear 3D features, and generates 3D scene flexibly and easily.

Key words: linear feature, 3D model, small units combination, 3D platform, element

摘要： 分析了线状地物建模和三维平台软件加载线形三维模型中存在的问题，提出了一种以小单元组合的方式参数化定制线状地物，加载线形三维模型的方法。该方法以线状地物的空间坐标作为参数，根据需要构建每种线状地物的三维模型小单元，将其作为基元，以基元的空间位置、姿态和缩放比例为关键参数，给出关键参数的计算方法，按照关键参数将基元组合生成线形三维模型加载到三维平台软件中。该方法参数化定制线状地物，简化了三维线状地物建模的工作量，灵活简便地生成三维场景。

关键词: 线状地物, 三维模型, 小单元组合, 三维平台软件, 基元