Human-Computer Interaction Research True Three-Dimensional Gravity Inversion Visualization

In recent years, as computer technology, human-computer interaction technology, visualization technology and three-dimensional display technology development rapidly, geologists are more interested in using three-dimensional graphics to show the geological body. This thesis developed a software system on the base of Visit, an open source software, and programmed with Python language, accomplishing plenty of functions such as data visualization, geological modeling, human-computer interaction and converting abstract data into intuitive visual 3D graphics. Then using human-computer interaction, geophysicists could combine their experience in prospecting with real 3D visualization scene, based on the degree of results during interaction process, finishing the inversion by gravity forward fitting.This thesis was mainly focus on the research of the following three aspects:Firstly, after researches on gravity anomaly forward theory, 3D geological body modeling theory, visualization technology and software engineering, this thesis designed and second developed three dimensional human-computer interactive inversion software system, programmed with Python language, on the base of Visit, a kind of visualization and open source software based on VTK. Secondly, this software system has UI interface and display window interface. The UI interface can be:(1) Assigning corresponding parameters to density model or changing parameters of density model.(2) Constructing initial density model rapidly.(3) Adding or reducing density model with the shape of strip, surface or body and scaling, moving, combining and doing other operations for a single density model or multiply density models. The display window interface can be:(1) Displaying stereo diagram of overlaid forward field and observation field, stereo diagram of source network area and density model, graph of two-dimensional forward field and graph of fitting difference between forward field and observation field with four windows.(2) Synchronous display in above windows when changing density model.(3)Rotating, zooming in and out, panning, conversing background color and resetting view of all elements in each window.(4) Generating two images with binocular parallax of corresponding window, making preparation for the realization of true 3D. Thirdly, according to the principle of three-dimensional display, build hardware platform with workstation, projector, metal curtain, polarizer and polarization analyzer. The working process is to project images which binocular parallax with each other via two different projectors at first, then project two images on the metal curtain by polarizer which has perpendicular polarizations, then make binocular images come into left and right eyes by polarization analyzer, and fusion by optic nerve center, forming three-dimensional effect. Finally, we can carry on human-computer interactive inversion of gravity in true 3D environment.3D visualization of human-computer real-time interactive inversion of gravity is still in initial stage in our country, the development of this software is very meaningful.