如果物体通过几何变换而被放置在世界坐标系中,比如通过平移和旋转,那么视图跟踪他在世界坐标系中位置变换的轨迹可能会是一个艰难的工作。
If the object is positioned in the world through geometric transformations, such as translations and rotations, then keeping track of its position in world coordinates can be a hard task.
它在底层采用特征依赖图保存数据模型,中层用细胞元模型作几何模型,在用户层用视图模型表示。
It USES FDG as data model, cell-based model as geometric model, and view model as user interface, but it is more complex than the former system based on parameter and history.
在底层它用特征依赖图作为数据模型,在中层用细胞元模型作几何模型,在用户层用视图模型表示。
It USES feature dependent graph as data model, cell-based model as geometric model, and view model as user interface, but it is more complex than the former system based on parameter and history.
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