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"abstract": "Highly elaborated visualization techniques that are\nbased on surfaces often are independent from the\norigin of the surface data. Nevertheless, most of the\nrecently presented advanced visualization methods\nwere developed for a specific type of surface\nalthough principally applicable to generic\nsurfaces. In this paper we discuss a unified surface\ninterrogation model which provides generic access to\nsurface properties up to degree two, i.e., surface\npoint locations, normals, and curvature properties,\n(almost) regardless of the origin of the\nsurface. Surface types and interrogation algorithms\nare compared and summarized. At the end of this paper\nwe present an object-oriented implementation of this\n\t\t model, called SMURF.",
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"title": "Fast Visualization of Object Contours by Non-Photorealistic Volume Rendering",
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"abstract": "In this paper we present a fast visualization technique for\nvolumetric data, which is based on a recent non-photorealistic\nrendering technique. Our new approach enables alternative\ninsights into 3D data sets (compared to traditional approaches\nsuch as direct volume rendering or iso-surface rendering).\nObject contours, which usually are characterized by locally high\ngradient values, are visualized regardless of their density values.\nCumbersome tuning of transfer functions, as usually needed for setting\nup DVR views is avoided. Instead, a small number of parameters is available to adjust the non-photorealistic display.\nBased on the magnitude of local gradient information as well as on\nthe angle between viewing direction and gradient vector, data values\nare mapped to visual properties (color, opacity), which then are\ncombined to form the rendered image (MIP is proposed as the default\ncompositing stragtegy here). Due to the fast implementation of this\nalternative rendering approach, it is possible to interactively\ninvestigate the 3D data, and quickly learn about internal structures.\nSeveral further extensions of our new approach, such as level lines\n are also presented in this paper.",
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"abstract": "Ideal reconstruction filters, for function or arbitrary\nderivative\nreconstruction, have to be bounded in order to be\npracticable since they are infinite in their spatial extent. This can\nbe accomplished by multiplying them with windowing functions. In this\npaper we discuss and assess the quality of commonly used windows and\nshow that most of them are unsatisfactory in terms of numerical\naccuracy. The best performing windows are Blackman, Kaiser and\nGaussian windows. The latter two are particularly useful since both\nhave a parameter to control their shape, which, on the other hand,\nrequires to find appropriate values for these parameters. We show how\nto derive optimal parameter values for Kaiser and Gaussian windows\nusing a Taylor series expansion of the convolution sum. Optimal values\nfor function and first derivative reconstruction for window widths of\n two, three, four and five are presented explicitly.",
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"abstract": "In this paper we present a two-level approach for\nfusing direct\nvolume rendering (DVR) and maximum-intensity projection (MIP)\nwithin a joint rendering method.\nDifferent structures within the data-set are rendered locally by\neither MIP or DVR on an object-by-object basis. Globally all the\nresults of subsequent object renderings are combined in a merging step\n(usually compositing in our case). This allows to selectively\nchoose the most\nsuitable technique for depicting each object\nwithin the data, while keeping the amount of information contained in\nthe image at a reasonable level.\nThis is especially useful when inner\nstructures should be visualized together with semi-transparent outer\nparts, similar to the focus-and-context approach known\nfrom information visualization. We also present an implementation of our\n\napproach, which allows to explore volumetric data using\ntwo-level rendering at interactive frame rates.\n",
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"title": "Interactive High-Quality Maximum Intensity Projection",
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"abstract": null,
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"title": "Two-level volume rendereing - fusing MIP and DVR",
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385
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"note": "IEEE Visualization 2000 Proceedings, 2000, pp. 211-218. Revised version will be published in IEEE Transactions on Computer Graphics and Visualization",
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"id": "Groeller-2000-Vis",
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"title": "Visualization of Analytically Defined Dynamical Systems",
"date": "2000",
"abstract": null,
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165,
166,
399
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"note": "In H. Hagen, G.M. Nielson, F. Post (eds.), Proceedings Dagstuhl'97, Scientific Visualization, IEEE Computer Society, 2000, pp. 71-82",
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"tu_id": null,
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"title": "Interactive High-Quality Maximum Intensity Projection",
"date": "1999-12",
"abstract": "Maximum Intensity Projection (MIP) is a volume\nrendering technique\nwhich is used to visualize high-intensity structures within volumetric\ndata. At each pixel the highest data value, which is encountered along a\n\ncorresponding viewing ray is depicted. MIP is, for example, commonly\nused to\nextract vascular structures from medical data sets (angiography). Due\nto lack of depth information in MIP images, animation or interactive\nvariation of viewing parameters is frequently used for\ninvestigation. Up to now no MIP algorithms exist which are of both\ninteractive speed and high quality.\nIn this paper we present a high-quality MIP algorithm (trilinear\ninterpolation within cells), which is up to 50 times faster than\nbrute-force MIP and at least 20 times faster than comparable optimized\ntechniques. This speed-up is accomplished by using an alternative\nstorage scheme for volume cells (sorted by value) and by removing\ncells which do not contribute to any MIP projection (regardless of the\nviewing direction) in a preprocessing step. Also, a fast maximum\nestimation within cells is used to further speed up the algorithm.\n",
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176,
166
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"number": "TR-186-2-99-25",
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"title": "Smart surface interrogation for advanced visualization\ntechniques",
"date": "1999-11",
"abstract": "Highly elaborated visualization techniques that are based on\nsurfaces often are independent from the origin of the surface data.\nNevertheless, most of the recently presented advanced visualizatio\nmethods were developed\nfor a specific type of surface although principally applicable\nto generic surfaces. In this paper we discuss a unified surface\ninterrogation model which provides generic access to surface\nproperties up to degree two, i.e., surface-point locations,\nnormals, and curvature properties, regardless of the origin\nof the surface. Surface types and interrogation algorithms\nare compared and summarized. At the end of this paper we present\n an object-oriented implementation of this model, called {\\sc{}Smurf",
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175,
197,
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"number": "TR-186-2-99-19",
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"id": "Mroz-1999-Adv",
"type_id": "techreport",
"tu_id": null,
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"title": "Advanced High-Quality Maximum Intensity Projection for Volume Visualization",
"date": "1999-04",
"abstract": "Maximum Intensity Projection (MIP) is a volume\nrendering technique\nwhich is used to extract high-intensity structures from volumetric data.\nAt\neach pixel the highest data value encountered along the\ncorresponding viewing ray is determined. MIP is commonly used to\nextract vascular\nstructures from medical MRI data sets (angiography). Due to lack of\ndepth information in MIP images, animation of the viewpoint is\nfrequently used for viewing. Although\ninteractive MIP algorithms exist, the quality of the results is\nmoderate. The generation of high-quality MIP animation loops is\ncomputationally expensive with rendering times of several seconds per\nframe.\nIn this paper we present a fast algorithm for high-quality MIP.\nCells of the data set\nwhich will never contribute to a MIP due to their neighborhood are\nremoved during a preprocessing\nstep. The remaining cells are stored in a way which improves cache\ncoherency\nindependent of the viewing direction and minimizes the number of\nrequired maximum evaluations.",
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{
"id": "Groeller-1999-Vis",
"type_id": "misc",
"tu_id": null,
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"title": "Visualization of Dynamical Systems.",
"date": "1999",
"abstract": null,
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"authors": [
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"note": "F.Post, D. Silver (eds.) Journal Future Generation Computer Systems, Elsevier, Vol. 15(1), February 1999, pp.75-86.",
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{
"id": "Groeller-1999-Dat",
"type_id": "misc",
"tu_id": null,
"repositum_id": null,
"title": "Data Visualization '99",
"date": "1999",
"abstract": null,
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"note": "Springer 1999",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1999/Groeller-1999-Dat/",
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{
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"tu_id": null,
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"title": "SMURF a Smart Surface model for advanced visualization techniques",
"date": "1999",
"abstract": null,
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175,
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"note": "N.M. Thalmann, V. Skala (eds.),
Proceedings of WSCG'99, The 7-th International Conference in Central Europe on Computer Graphics, Visualization and Interactive Digital Media'99, February 8 - 12, 1999, Plzen, Czech Republic, Vol. I, pp. 156-164.",
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"id": "Loeffelmann-1998-SMURF",
"type_id": "techreport",
"tu_id": null,
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"title": "Smurf -- a Smart surface model\n\tfor advanced visualization techniques",
"date": "1998-10",
"abstract": "Highly elaborated visualization techniques that are based on surfaces often are independent from the origin of the surface data. For re-using advanced visualization methods for surfaces of various kind, we developed an abstract surface interrogation layer called Smurf. In this paper we discuss the steps necessary to unify multiple types of surfaces under a shared general purpose interface.",
"authors_et_al": false,
"substitute": null,
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"authors": [
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175,
197,
166
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"number": "TR-186-2-98-26",
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{
"id": "Mroz-1998-Bri",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Bringing Your Visualization Application to the Internet",
"date": "1998-04",
"abstract": "The Internet has a growing importance as a medium for\npresenting\nvisualization and offering visualization tools. Due to strong\nvariations in the quality of avaliable resources it is extremely\ndifficult to design visualization systems including the Internet, which\nare capable of interactively\nvisualizing user data. In this paper we identify requirements for\na distributed visualization system to interactively visualize user data.\nAs a possible solution to the identified problems we\npresent a model for a visualization pipeline capable of fulfilling these\nrequirements. Finally a proof-of-concept implementation of our ideas\ninto Net Phase Plane, a visualization tool for dynamical systems, is\ndiscussed.",
"authors_et_al": false,
"substitute": null,
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"authors": [
184,
399,
166
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"number": "TR-186-2-98-14",
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"keywords": [
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"visualization over the internet"
],
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{
"id": "Mroz-1998-SelX",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Selected Trends in Scientific Visualization",
"date": "1998-04",
"abstract": "Visualization became an important branch of scientific\nresearch during the past decade. Some topics of visualization, e.g., flow\nvisualization and volume visualization, already\nprovide lots of high-quality solutions to the most important\nproblems. Others such as information visualization, are rather\nyoung disciplines which continuously provide lots of new\nadvances. One such topic is the visualization over the Internet.\nQuite a number of approaches emerged during the last two years\nwhich facilitate this idea and embed the World Wide Web into the\nvisualization process. Another trend in visualization is\ncollaborative visualization within an augmented reality setup.\nUsers exploit real 3D interaction and augmented\nreality to combine\ncommunication and investigation during research or education.\nThirdly, the visualization of multi-dimensional and multi-modal\ndata is a rather hot challenge to current scientific research.\nCoping with the restriction of just a few dimensions for\nrepresenting visualization results is a big open problem in\nvisualization and currently subject to eager research.",
"authors_et_al": false,
"substitute": null,
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184,
399,
166
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"number": "TR-186-2-98-15",
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"keywords": [
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"web technologies",
"Visualization"
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{
"id": "Loeffelmann-1998-VDS",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Visualizing Dynamical Systems near Critical Points",
"date": "1998-03",
"abstract": "In this paper we present two visualization techniques.\nOne uses the topological structure of the dynamical system near\ncritical points to build an abstract description of the flow.\nThe other places bunches of streamlets around the critical\npoints to visualize the flow characteristics locally.\nCombining both methods a powerful visualization technique is\npresent, since both the topological information as well as\n intuitive visual cues are provided.",
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399,
212,
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"number": "TR-186-2-98-09",
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"id": "Castro-1998-TFS",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Transfer Function Specification for the Visualization of\n Medical Data",
"date": "1998-03",
"abstract": "The application of transfer functions to map data\nvalues to visual properties as, e.g., color and opacity, is\na crucial step in direct volume rendering. Due to the\ncomplex relationship between the transfer function and the\nresulting image it is usually extremely difficult to model\nan appropriate mapping. In this paper we present an\nadvanced transfer function specification scheme for the\nvisualization of medical data. The concept of metadata is\nused to make the modeling of transfer functions more\nintuitive. A small number of parameters is sufficient to\ncompletely describe a transfer function, thus this\nspecification scheme is suitable for (semi-)automated search\n techniques.",
"authors_et_al": false,
"substitute": null,
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"authors": [
408,
197,
399,
166
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"number": "TR-186-2-98-12",
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{
"id": "Groeller-1998-VAD",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Visualization of Analytically Defined Dynamical\nSystems",
"date": "1998-02",
"abstract": "The visualization of analytically defined dynamical systems is\nimportant for a thorough understanding of the underlying system\nbehavior. An overview of theoretical concepts concerning\nanalytically defined dynamical systems is given. Various\nvisualization techniques for dynamical systems are discussed.\nThree current research directions concerning the visualization of\ndynamical systems are treated in more detail. These are: texture\nbased techniques, visualization of high-dimensional dynamical\n systems, and advanced streamsurface representations. ",
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"substitute": null,
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"number": "TR-186-2-98-06",
"pages_from": "1",
"pages_to": "31",
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"keywords": [
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"id": "Groeller-1998-VDS",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Visualization of Dynamical Systems",
"date": "1998-02",
"abstract": "The visualization of analytically defined dynamical systems is\nimportant for a thorough understanding of the underlying system\nbehavior. An introduction to analytically defined dynamical\nsystems is given. Various visualization techniques for dynamical\nsystems are discussed. Several current research directions\nconcerning the visualization of dynamical systems are treated in\nmore detail. These are: texture based techniques, visualization\nof high-dimensional dynamical systems, advanced streamsurface\nrepresentations, local analysis - Poincare' sections,\n visualizing econometric models.",
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"substitute": null,
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"number": "TR-186-2-98-07",
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"pages_to": "18",
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"id": "Fuhrmann-1998-CVA",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Collaborative Visualization in Augmented Reality",
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"note": "In 6th International Workshop on Digital Image Processing and Computer Graphics (DIP-97): Applications in Humanities and Natural Sciences, Emanuel Wenger, Leonid I. Dimitrov, Editors, Proceedings of SPIE vol 3346, pp. 146-154, (1998).",
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"title": "Enhancing the Visualization of Characteristic Structures in Dynamical Systems",
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"note": "Proceedings of 9th EUROGRAPHICS Workshop on Visualization in Scientific Computing, Blaubeuren, Germany, April 20.-22., 1998, pp. 35-46. Republished in D. Bartz (ed.), Visualization in Scientific Computing'98, Springer, pp.59-68.",
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"note": "IEEE Computer Graphics & Applications, Vol. 18, No. 4, pp. 54-59, IEEE Computer Society, 1998.",
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"id": "Loeffelmann-1998-Vis",
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"title": "Visualizing Poincaré Maps together with the Underlying Flow",
"date": "1998",
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"note": "Proceedings of the International Workshop on Visualization and Mathematics'97, Berlin-Dahlem, Germany, September, 16.-19., 1997. In H.-Ch. Hege, K. Polthier (eds), Mathematical Visualization, Springer Heidelberg, 1998, pp. 315-328.",
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"id": "Loeffelmann-1998-Visu",
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"title": "Visualizing Dynamical Systems near Critical Points, Proceedings of Spring Conference on Computer Graphics 1998 (SCCG'98), Budmerice, Slovakia, April 23.-25., 1998, pp",
"date": "1998",
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"id": "Purgathofer-1997-SNT",
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"title": "Selected New Trends in Scientific Visualization",
"date": "1997-09",
"abstract": "Visualization became an important branch of\nscientific research\nduring the past decade. Some topics of visualization, for\nexample, flow visualization and volume visualization, already\nprovide lots of high-quality solutions to the most important\nproblems. Others as, e.g., information visualization, are rather\nyoung disciplines which continuously provide lots of new\nadvances. One such topic is the visualization over the Internet.\nQuite a number of approaches emerged during the last two years\nwhich facilitate this idea and embed the World Wide Web into the\nvisualization process. Another trend in visualization is\ncollaborative visualization within an augmented reality setup.\nUsers exploit real 3D interaction and augmented reality to combine\ncommunication and investigation during research or education.\nThirdly, the visualization of multi-dimensional and multi-modal\ndata is a rather hot challenge to current scientific research.\nCoping with the restriction of just a few dimensions for\nrepresenting visualization results is a big open problem in\n visualization and currently subject to eager research.",
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"id": "Fischel-1997-CSVVP",
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"title": "Case study: Visualizing Various Properties of\n\t\t Dynamical Systems",
"date": "1997-09",
"abstract": "There is a wide range of visualization techniques for\ndynamical systems. These methods are used to visualize certain\nproperties as, e.g., stability of fixed points, characteristic changes\nof velocity, and bifurcations. This paper gives a short introduction\nto dynamical systems and describes several visualization\ntechniques. Some of those are applied to three different dynamical\nsystems. The application of different visualization methods to\ndynamical systems shows, how scientific visualization can be used for\nanalyzing the behavior of dynamical systems, and how visualization can\n make analysis of a dynamical system fast and efficient.",
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"title": "Geometry of Mixed-mode Oscillations in the 3-d\n Autocatalator",
"date": "1997-08",
"abstract": "We present a geometric explanation of a basic mechanism\ngenerating mixed-mode oscillations in a prototypical simple\nmodel of a chemical oscillator. Our approach is based on\ngeometric singular perturbation theory and canard solutions. We\nexplain how the small oscillations are generated near a special\npoint, which is classified as a folded saddle-node for the\nreduced problem. The canard solution passing through this point\nseparates small oscillations from large relaxation type\noscillations. This allows to define a one-dimensional return\nmap in a natural way. This bimodal map is capable of\nexplaining the observed bifurcation sequence convincingly.",
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"id": "Loeffelmann-1997-FV2",
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"title": "Fast Visualization of 2D Dynamical Systems\n by the use of Virtual Ink Droplets",
"date": "1997-04",
"abstract": "This paper presents a new visualization technique for\nflow fields in 2D. It utilizes a physical model of smearing ink over a\nsheet of paper as an intuitive metaphor for the representation of a\ndynamical system. This technique is capable of producing images that are\ncomparable to those generated with line integral convolution (LIC),\nwhich is a well-known and established visualization technique for planar\nvector fields. Similar to oriented line integral convolution (OLIC), an\nextension to LIC, the virtual ink droplet method is capable of\nvisualizing not only direction and velocity of flow (as LIC does), but\nalso the orientation of vectors. The main advantage of the new method\nis, that animation sequences, which intuitively represent the dynamics\ninduced by the underlying dynamical system, can be computed much more\nefficiently than by the use of LIC or OLIC. A speed-up of about 200 is\nusually achieved when virtual ink droplets are used instead.",
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"number": "TR-186-2-97-13",
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"id": "Wegenkittl-97-VBH",
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"title": "Visualizing the Behavior of Higher Dimensional\n Dynamical Systems",
"date": "1997-03",
"abstract": "In recent years scientific visualization has been\ndriven by the need to visualize high-dimensional data sets within\nhigh-dimensional spaces.\nHowever most visualization methods are designed for showing some\nstatistical features of the data set. This paper deals with the\nvisualization of trajectories of high-dimensional dynamical systems\nwhich form a L^n_n data set of a smooth n-dimensional flow. Three\nmethods that are based on the idea of parallel coordinates are\npresented and discussed. Visualizations done with these new methods\nare shown and an interactive visualization tool for the exploration\nof high-dimensional dynamical systems is proposed.",
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"id": "fuhrmann-1997-CAR",
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"tu_id": null,
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"title": "Collaborative Augmented Reality: Exploring Dynamical\n Systems",
"date": "1997-03",
"abstract": "In this paper we present collaborative scientific\nvisualization in STUDIERSTUBE. STUDIERSTUBE is an augmented reality system\nthat has several advantages over conventional desktop and other virtual\nreality environments, including true stereoscopy, 3D-interaction,\nindividual viewpoints and customized views for multiple users, unhindered\nnatural collaboration and low cost. We demonstrate the application of this\nconcept for the interaction of multiple users and illustrate it with\nseveral visualizations of dynamical systems in DynSys3D, a visualization\nsystem running on top of AVS.",
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"number": "TR-186-2-97-09",
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"id": "Loeffelmann-1997-VPM",
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"title": "Visualizing Poincare Maps together with the\n\t\tunderlying flow",
"date": "1997-03",
"abstract": "We present a set of advanced techniques for the\nvisualization of 2D Poincare maps. Since 2D Poincare\nmaps are a mathematical abstraction of periodic or\nquasiperiodic 3D flows, we propose to embed the\n2D visualization with standard 3D techniques to improve the\nunderstanding of the Poincare maps. Methods to enhance\nthe representation of the relation $x\\leftrightarrow{}P(x)$,\ne.g., the use of spot noise, are presented as well as\ntechniques to visualize the repeated application of $P$,\ne.g., the approximation of $P$ as a warp function. It is\nshown that animation can be very useful to further improve\nthe visualization. For example, the animation of the\nconstruction of Poincare map $P$ is inherently a proper\nvisualization. During the paper we present a set of\n examples which demonstrate the usefulness of our techniques.",
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"number": "TR-186-2-97-06",
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"title": "Hierarchical Streamarrows for the Visualization of\n Dynamical Systems",
"date": "1997-01",
"abstract": "Streamarrows are a technique to enhance the use of\nstreamsurfaces by separating arrow-shaped portions from the\nremaining streamsurface. We present a hierarchical streamarrows\nalgorithm as an extension to this technique: Streamarrows are\nlocally chosen from a stack of scaled streamarrows textures to\navoid too big or small streamarrows in the rendered image. We\nfurthermore present techniques how streamarrows can be extended\ninto 3D, namely perpendicular to the streamsurface: streamarrows\ncan be shifted slightly out of the streamsurface. Another\nextension in this category is to represent the outline of\nstreamarrows as 3D tubes. We show a set of images which have been\n rendered using this technique and report about ongoing research.",
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"title": "DynSys3D: A workbench for developing advanced\nvisualization techniques in the field of\n three-dimensional dynamical systems",
"date": "1996-11",
"abstract": "This work describes DynSys3D, a framework for testing and\nimplementing visualization techniques in the area of three-dimensional\ndynamical systems. DynSys3D has been designed to meet requirements which\nallow a fast and modular investigation of dynamical systems. Such\nrequirements are, e.g., extendability, interactivity, and symmetry. Some\nvisualization examples realized with DynSys3D illustrate the flexibility of\nthe system.",
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"id": "loeffelmann-1996-SVM",
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"title": "Streamarrows: Visualizing Multiple Layers of\n Streamsurfaces",
"date": "1996-04",
"abstract": "Occlusion is a crucial spatial cue for the human visual\nsystem. Painters as well as researchers in the field of\ncomputer graphics have been dealing with this aspect for a\nlong time. In the field of visualization occlusion can be\nespecially problematic. We present a new approach to\ndealing with streamsurfaces that occlude major parts of the\nsystem representation. Analyzing mixed-mode oscillations,\nwhich are a special class of analytically defined dynamical\nsystems, we came across geometrically complex streamsurfaces\nwith curly shape. Certain regions of these surfaces, that\nare necessary to describe the behavior of the system,\nocclude major parts of the model. We combined and adopted\nseveral visualization techniques to deal with this problem.\nStreamarrows, which are semi-transparent portions of the\nstreamsurface, allow the viewer to see through and diminish\nthe problem of occlusion. Cross-sections and the removal\nof certain portions of the model reduce occlusion as well\nand thus improve visual perception. Choosing the shape of\nan arrow for segmentation allows to visualize even more\ninformation at the streamsurface, e.g., the direction of\nthe flow. An anisotropic spot noise texture is further\nused to emphasize flow within a streamsurface. Finally\nanimation techniques were applied to facilitate the\ninterpretation of dynamical systems with complex shaped\n streamsurfaces.",
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"id": "loeffelmann-1996-CVA",
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"title": "Classifying the Visualization of Analytically Specified\n Dynamical Systems",
"date": "1996-04",
"abstract": "In this paper we suggest a classification of visualization\ntechniques for analytically specified dynamical systems\ninto four different approaches. We distinguish between local\nproperties, the topology of behavior, global properties, and\nclasses of dynamical systems with respect to various topics\nof visualization. By presenting advanced visualization\ntechniques that we applied during three recent projects, we\ndiscuss their embedding within the classification scheme The\ndynamical systems visualized are the ``Dynastic Cycle'',\nwhich is a model for rise and fall of dynasties in ancient\nChina, the ``Wonderland'' model, that simulates the\ninteractions of population growth, economic activities, and\nenvironmental pollution, and a model for mixed-mode\n oscillations, which occurs in chemistry. ",
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"type_id": "techreport",
"tu_id": null,
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"title": "BABEL: A Generic Data structure for Geometric Modeling",
"date": "1995-11",
"abstract": "We present a basic data structure for geometric data which\ncan be adapted to represent common geometry representations\nlike CSG, BSP, aso. The new data structure has been designed\nto be easy to use, and easy to extend. Due to the\nrepresentation of geometric data using a directed acyclic\ngraph, a number of the standard rendering algorithms can be\nused on the data structure in a very straightforward way.\nThe new data structure has been implemented as a C++ library\nand can therefore serve as high-level tool for developing\ngraphics applications, or as an extension for using C++ as a\n modeling language.",
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"type_id": "techreport",
"tu_id": null,
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"title": "Ray Tracing with Extended Cameras",
"date": "1995-03",
"abstract": "This paper presents an extension of the camera module for ray\ntracers. As an alternative to the standard pinhole camera an\nAbstract Camera Machine is introduced, which represents a\ngeneralization of the camera module at an abstract level. The\nAbstract Camera Machine itself is based on simple\ntransformations and mappings, which are chosen from a large\nset of representatives. They are integrated as sub-modules\nto complete the camera mapping procedure, which generates\nrays out of image locations (pixels). Depending on what type\nof transformations are used, many different extended cameras\ncan be built. The structure of the Abstract Camera Machine\nand an overview of the transformations and mappings are\ngiven. Some results, which were rendered by using a public\ndomain ray tracer in combination with the extended cameras,\nare presented as well. They show the feasibility of this\napproach and give an impression of the areas of application\nfor this extension to the camera module. Using extended\ncameras it is easily possible to produce special and artistic\neffects, e.g., a local zoom of especially interesting\nregions. Overviews of given scenes can be modelled and\nseveral views of the same object can be integrated into one\npicture, e.g., a building could be shown from the inside\n\t\t and the outside simultaneously.",
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"title": "Parametrizing Superquadrics",
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"location": "University of West Bohemia, Plzen, Czech Republic",
"note": "TALK: H. Löffelmann 14.2.1995",
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"title": "VEGA: Vienna Environment for Graphics Applications",
"date": "1995-02",
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"note": "TALK: R. Tober",
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"title": "VEGA: Vienna Environment for Graphics Applications",
"date": "1994-11",
"abstract": "This paper presents a software development environment\nfor rendering applications. The main parts of this\nenvironment are a set of rules concerning the coding\nstyle, a set of tools to maintain source files and a\nnumber of libraries providing graphics functionality.\nThe environment has been succesfully used in a number\n of internal projects, dealing with rendering.",
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"id": "Loeffelmann-1994-PSQ",
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"title": "Parameterizing Superquadrics",
"date": "1994-11",
"abstract": "Superquadrics are well known and often used 3D\nsurface objects in computer graphics. They are used\nfor modelling parts of scenes that are then rendered\nusing photorealistic image synthesis algorithms (e.g.,\nray tracing). For some techniques, like texturing,\nwhich are part of these rendering methods, the type\nof the parameterization of such a surface has to be\nchosen carefully and is not intuitively obvious at\nfirst sight. There are cases, where the straight\nforward extension of quadric parameterizations to\nsuperquadrics do not produce satisfying results. We\ntherefore investigate a number of different\nparameterizations in combination with the\ncorresponding formulas, and point out some\n significant differences between them.",
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"id": "Purgathofer-1994-CPI",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "A Collection of Papers of the Institute of Computer\n Graphics",
"date": "1994-08",
"abstract": "This is the first technical report of the Institute of\nComputer Graphics at the Technical University of Vienna.\nIt contains papers published by our research group between\n1992 and 1993 providing an overview of our work during that\n time.",
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"title": "Extended Camera Specification for Image Synthesis",
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