Research And Development Of Three-dimensional Scene

The development of scenes is a very important part in research and developing three-dimensional visualization system, computer cartoon and VR(Virtual Reality.After extensive investigation on the progress of 3D GIS world-wide, the author applied the program language and tools of VC++6. 0, OpenGL and 3DS max5 to research and develop scenes in three-dimensional visualization system.The paper introduce the graphic base and the basic algorithm to develop a three-dimensional visualization scenes in detail. The scenes is generally classified to outdoor and indoor. The outdoor scenes is the on-earth bodies mainly includes DEM, river, road, vegetation and buildings. The study shows that process and method of how to construction terrain by the regulation grid, realize several simple spatial inquirement, and emphasis on research that how to use LOD in walkthrough the scenes. The indoor scenes includes the building indoor and detail bodies inside (such as furniture, electric machines). The paper only discusses how to model building indoor by 3DS max, and we will walkthrough it after the data is read into OpenGL.The study shows that OpenGL can realize high three-dimensional graphic function, but its modeling function is relatively weak, it only provide several function to draw simple graphic element and it is very difficult to modeling a complicated bodies. So OpenGL must combine with other software which is good at modeling. The modeling data will be read into OpenGL to reconstructiong by certain algorithm, which can avoid complicated works of modeling a complicated body.Now three-dimensional visualization is the hot spot and the difficult spot in 3D GIS research. Though many scholars have studied method and theory of 3D GIS and get some outcomes, up to the present there is nota 3D CIS system which can be called the true 3D CIS system. So we must keep on studying theory and practicing in 3D GIS.