| Real 3D is the emphasis and difficulty of current 3D visualization research, especially the characteristics of geologic data which is multi-source,different structure, multi-scale put forward higher demands to 3D visualizing model which has real 3D data structure,and the model not only meets the demands of 3D display of complex geological space, but also supports geologic spatial analysis.Geological 3D visualization comprises two parts, that are geological entity visualization and geological field visualization. Geological entity visualization is that the visualization which contains the spatial shape of stratum, rock, and geological structure, and geological field visualization is that the visualization of spatial distributing characteristics of geological attributes, such as density, porosity, resistivity, view magnetization and so on. For a long time, people neglect the 3D visualization study of geological field, so all kinds of existent 3D models are not suitable for the 3D expression of geological field and can not meet the professional demands of geology and exploration. As a result, the paper did a detailed study on the theory and technology of geological entity visualization and geological field visualization, combining with geology and geophysics effectively.1. Putting forward real 3D visualizing entity model based on Multi-Scale Spatial Voxel Volume (M-S SVV for short).The key content of geological 3D visualization model is data model, aiming at resolving the deficiencies that facial model, entity model, mixed model, and other classic 3D visualization model methods encountered in the application of the geologic 3D visualization, and this paper proposed the real 3D visualizing entity model based on the M-S SVV, which perfected the theoretical model and the mathematical definition of M-S SVV, discussed geologic spatial analysis,and studied spatial analytical technology such as data cutting, geological layer analysis,virtual drilling and geological calculation, established the foundation for building, displaying,and spatial analysis of 3D model of complex geological body and geological field, and solved the problem about multi-source, different structure, multi-scale of geological data.2. Discussing the modeling methods of geological body and geological field.This paper established 3D visualization modeling method of complex geological body such as stratum, rock and geological field such as density and magnetic density preliminarily. And detailedly discussed 3D modeling of multilayer interface, information extraction of geological field, simulating algorithm of geological entity and other key technologies. At the same time, achieved correlative algorithm, developed correlative programs, and validated the expressive capability and adaptability of M-S SVV model to complex geological body and geological field.3. Discussing 3D visualization technology of M-S SVV based on multi-scale cuboid.This paper constituted programmes of 3D visualization, and designed visualizing mode based on OpenGL.At the same time, put forward the method achieving 3D visualization of M-S SVV in the form of multi-scale cuboid in order to solve the problem about multi-scale spatial expression of geological data, and established mixed model of spatial regular grid and multi-scale cuboid so as to enhance 3D effects, through analyzing and studying all kinds of models.4. Developing the software of 3D modeling and visualization.The 3D modeling software and 3D visualization software were developed, which basically achieved the 3D modeling of complex geological bodies and geological field. The paper also studied the interactive spatial cutting, virtual drilling, and the analysis of geological layers.Finally, the method was used in the actual geological data, and the testing results showed the M-S SVV model had a good adaptability for the geologic data, meeting the demands of the M-S expression and analysis in geologic space well, supplied an effective way for the displaying and analyzing of the geologic data, even provided the basical services for the professional analysis and modeling of geology, geophysics and other disciplines. |
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