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Related Work2.1. Data Flow Models• Final ImageIt is either created on the fly using OpenGL–commands or the Render objectcreates a texture. In figure 2.2 the screen icon represents the final image.⋄ User InteractionOne important aspect is missing in the traditional visualization pipeline whichis the user and his needs to interact with the system. Due to that lack JockMacKinley[SKCM99] proposed a user centered visualization pipeline. This isaddressed in section 3.12 on page 64.The visualization pipeline is widely used in visualization systems likeVTK[VTK96], Open Visualization Data Explorer[DX91] (see figure 2.11page 15) and other packages. In the field of information visualization extensionto the traditional pipeline are very popular like the one proposed by JockMacKinlay[SKCM99]. In 1996 the data flow model was adapted to computer sciencefirst in SketchPad by Sutherland[Sut63] and ThingPad in 1979 by Bornig[Bor79][Bor81][AHB87]. In 1989 Upson et al [CUL89] published their work on AVS,the Application Visualization System. Since they intended to include several differentvisualization algorithms in one framework they analyzed the structure and needs ofdifferent systems and algorithms. They came up with an analysis cycle shown infigure 2.3, that is similar to the visualization pipeline shown in figure 2.2 page 6.Figure 2.3: AVS analysis cycle[CUL89]. For details on the advanced visualization system (AVS) seesection 2.1.4 on page 14.The data flow model for scientific visualization by Dyer[Dye90] was extended forregular and irregular grids by Haber et al [RBHC91]. The software architecture fora scientific visualization system was analyzed and improved by Lucas et al. [BL92].Visualization of multi–variable data using object–oriented design was published by[FH94][RAEM94]. The data flow model was also applied to the multi–media componentkit by Demay et al [dMG93] and extensions to the data flow architecture were7
Related Work2.1. Data Flow Modelspublished by Abram [AT95] and Wright [HWB96]. The application of visual programmingvia a visual editor is also used in the field of multimedia like for instance inDirectShow 9.0 GraphEdit by Microsoft.The Visualization Toolkit (VTK) system paper by Schröder, Martin andLorensen [WJSL96] published in 1996 absorbed these concepts. VTK is open sourceproject[VTK96] and has evolved until now with a focus on volumetric rendering (seesection 2.2.8 page 36).The following list shows a collection of visualization systems whose data flow modelswill be observed in detail:1. SketchPad [1963]The first object–oriented visualization system with light pen interaction by IvanSutherland [Sut63].2. ThingLab [1979]Editor suitable of constraints[Bor79][Bor81]. Successor of SketchPad.3. AVS [1989]The Application Visualization System [CUL89][AVS92]. Its successor, AVSExpress evolved and is a very successful commercial product.4. Open DX [1991] c○by IBMVisualization system using visual programming for rapid prototyping [DX91].OpenDX is the short form for Open Visualization Data Explorer initially Theinitial project was named IRIX Explorer and it was renamed to Open VisualizationData Explorer (OpenDX) when IBM decided to release it as Open Sourceproject.5. OPEN INVENTOR [1993]An object–oriented scene graph system [Inv92]6. VTK [1996]The Visualization Toolkit [VTK96] [Sch97b] [WJSL97]7. VISAGE [1999]An object–oriented scientific visualization system [WJSV92]8. VISSION [1999]An object–oriented data flow system for simulation and visualization[Tv99][TvW99]Since our implementation of the CashFlow framework is based on a scene graph,it is important to introduce the concept of a scene graph. Scene graphs are object–orientated library and applications. In May 1994 Mark Pesce and Tony Parisi proposedVRML (Virtual Reality Markup Language) as a description language for static virtualenvironments. The name was soon altered to "Virtual Reality Modeling Language".On 24 th October 1994 the first draft on VRML 1.0 was released based on SGI 2 Open2 SGI, http://www.sgi.com/ [SGI]8
Page 1 and 2: D I P L O M A R B E I TCash FlowA V
Page 3 and 4: KurzfassungDie Fusionierung von Vis
Page 5: 3.7.2 Drawback of the Virtual Array
Page 9 and 10: Introductionis then executed using
Page 11 and 12: Related WorkAll of these frameworks
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Page 45 and 46: Chapter 3Software Design3.1 CashFlo
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Page 49 and 50: Software Design3.2. Using the Scene
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Software Design3.7. DataAccess Node
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Software Design3.8. Grid Nodealgori
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Software Design3.10. Render Nodes-
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Software Design3.12. User Interacti
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Chapter 4ImplementationFigure 4.1:
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Implementation4.1. Accessing Data4.
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Implementation4.1. Accessing Data4.
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Implementation4.2. UML Inheritance
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Implementation4.3. SoMultiDataNode4
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Implementation4.4. SoDataAccessNode
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Implementation4.5. Implementation o
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Implementation4.7. CashFlow Class H
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Implementation4.7. CashFlow Class H
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Results5.1. Combining MultiData Nod
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Results5.1. Combining MultiData Nod
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Results5.2. CashFlow Scene Graph Ex
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Results5.2. CashFlow Scene Graph Ex
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Results5.3. Curvilinear Grid Visual
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Results5.4. Streamlines in CashFlow
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Results5.5. Grid Iterator ExamplesF
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Results5.6. Example for Parameteriz
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Results5.7. Polygonal Surfaces & Te
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Appendix AField connection &TGS Mes
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DanksagungVielen Dank an meine Schw
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2.35 Colored Flow field topology ex
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Bibliography[3D] Java 3D. Java 3D c
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[CEI94] CEI. http://www.ceintl.com/
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[EYSK94] David S. Ebert, Roni Yagel
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[HP97] Hans - Christian Hege and Ko
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[MAY] MAYA. MAYA c○ by ALIAS c○
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[RBHC91] B. Lucas R. B. Haber and N
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[Tog02] Together. Borland R○ Toge
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[WJSV92] G. D. Montanaro William J.
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network, 39OpenDX, 15sink, 13source
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flow field, 19transfer function, 6t
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