Computer graphics in geology: three-dimensional computer by Reinhard Pflug, John W. Harbaugh

By Reinhard Pflug, John W. Harbaugh

Standpoint perspectives, resembling block diagrams and fence diagrams have consistently been a tremendous technique of medical visualiza- tion in geology. complex 3-dimensional desktop gra- phics is a brand new instrument for the development of such perspectives. The publication includes papers awarded on the first huge interna- tional assembly (Freiburg, October 8-11, 1990) that introduced jointly operating teams engaged in improvement of 3D visua- lization courses for geologic reasons, and integrated humans fromuniversities, govt companies, the mining undefined (especially oil businesses) and from software program businesses enga- ged in geology and geographic details structures. Many dif- ferent points of utilizing third-dimensional special effects are mentioned within the papers. emphasised are various ap- proaches of modeling and rendering a three-D geometric version, of remodeling strategy simulation effects into viewpoint perspectives, and use of third-dimensional computer-graphics as an extra software for interpretation and prediction. Prospec- tive readers contain geologists and geophysicists from aca- demia, govt and who should still locate ideason how to offer and interpret their very own geological observations and effects with assistance from three-d computing device gra- phics.

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I n each instance the lower surface of the sandbody was assumed to mirror the upper surface of the unit immediately beneath. The next step was to "regularize" the data for handling by the NURBS-based system. This was done by creating a series of profiles or sections, through the previously described contoured surfaces. These were sent to the solids modeling system where B-spline surfaces were fitted. The final step was to combine the B-spline surfaces to form true 3D solid models of the morphology of each sandbody.

Our study highhghts the D Sandstone, which at Noonen Ranch is a series of east-west t r e n d i n g aggradational stream deposits in a valley-fill complex (Fisher and Wales, 1990a). The sandstones modeled occur in four distinct and mappable units deposited in a faultcontrolled stream valley eroded into the underlying H u n t s m a n Shale. Individual sandbodies measure approximately 15 to 20 feet (4 to 6m) thick, 5400 feet (1645m) in length and 2600 feet (790m) in width. Our interest in modeling the sandbodies was to determine if more would be revealed about their geometry from solid models t h a n by conventional contour maps.

Other forms of inter-relationships can be defined based on metric characteristics and describing qualitative aspects. These include the direction or orientation of one object relative to another. Hemandez (1990) has proposed a form of description combining topological and directional information called a Relative Projection and Orientation Node (RPON) which has the following states: Tovolo~cal Inclusion Tangency o~erhp Disjointness DirecfiO~ Front Left-front Left Left-back Back Right-back Right Right-fr0nt A 3D equiv~ent could be envisaged introducing 'near' and 'fa~ conditions to expand the set.

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