Research on spatial relation representation mainly includes spatial topological relation, spatial cardinal direction relation and spatial distance relation.
对空间关系表示的研究主要包括空间拓扑关系、空间方向关系、空间距离关系三大类空间关系表示的研究。
Until now, there is no general representation for 3d topological structure, especially topological relationships between 3d solid objects.
目前还没有通用的方法表示三维空间拓扑结构，尤其是三维体对象之间的拓扑关系。
Until now, there is no general representation for 3d topological structure, especially topological relationships between 3d solid objects.
目前还没有通用的方法表示三维空间拓扑结构，尤其是三维体对象之间的拓扑关系。
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