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This paper discusses the necessity and main methods of developing the three-dimensional visual and interactive system. Then the method of combining OpenGL and 3DS MAX is chosen to build the system. System structure, data transmission and interaction were presented with UML. The realization of dynamic model, viewpoint control, real-time display and vanish and other techniques are studied to ensure...
The paper according to the actual situation of tunnels establishes six models, line tunnel, curve tunnel, link tunnel, vertical tunnel, trigeminal tunnel and binary tunnel based on tunnel midline, designs a general data structure for different section, and the corresponding algorithm of the acquisition for cross-section data of six kinds of model based on the section method. Finally, author implements...
Due to the fast growth of construction technologies and increasing demands on the efficient use of land, human living space are expanded from on the surface to above and under the surface. This has raised the need for 3D cadastre by recognizing that the current cadastre system based on 2D was not appropriate to reflect the trend. This paper proposed the 3D cadastre data model that is appropriate to...
Topological relationships between spatial objects are an essential property of spatial objects. They are used for spatial analysis and query processing. In this paper, we first introduce an alternative 3D geometric model, called the prism model. The prism model is based on an extrusion method from 2D footprints of 3D objects. Then we study the correspondence between the 2D topology of footprints and...
Currently used 3D models, which are mostly focused on visualization of 3D objects and lack topological structure, have limitation in being used for 3D spatial analyses and applications. However, implementing a full topology for the indoor spatial objects is less practical due to the increase of complexity and computation time. In this study, an alternative method to build a 3D indoor model with less...
3d data model of mine underground space is the key and difficulty of research on mine 3D GIS. In view of the existing problems of coal mine underground 3D spatial modeling, the whole mine underground space is described as an abstract models. Firstly, One concepts, dynamic field frame are introduced according to the relation between real mine underground space model and digital model. Secondly, there...
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