[ { "id": "Wimmer-1998-SMO", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Load Balancing for Smooth LODs", "date": "1998-12", "abstract": "The paper shows how to derive an analytic formula for the following problem: given a set of objects in a continuous level of detail representation, and given a total number of polygons to display, determine the number of polygons to use for each object so that the best overall appearance is achieved. This improves on the situation of discrete levels of detail, where the problem has been shown to be equivalent to a constrained knapsack-problem.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 193, 202 ], "number": "TR-186-2-98-31", "pages_from": "1", "pages_to": "5", "research_areas": [ "Geometry" ], "keywords": [ "smooth LODs", "level of detail", "load balancing", "virtual environments" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Wimmer-1998-SMO-paper.pdf", "type": "application/pdf", "size": 209382, "path": "Publication:Wimmer-1998-SMO", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Wimmer-1998-SMO/Wimmer-1998-SMO-paper.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1998/Wimmer-1998-SMO/Wimmer-1998-SMO-paper:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Wimmer-1998-SMO/", "__class": "Publication" }, { "id": "Fuhrmann-1998-Occ", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Occlusion in Collaborative Augmented Environments", "date": "1998-12", "abstract": "Augmented environments superimpose computer enhancements on the real world. Such augmented environments are well suited for collaboration of multiple users. To improve the quality and consistency of the augmentation the occlusion of real objects by computer-generated objects and vice versa has to be implemented. We present methods how this can be done for a tracked user's body and other real objects and how irritating artifacts due to misalignments can be reduced. Our method is based on simulating the occlusion of virtual objects by a representation of the user modeled as kinematic chains of articulated solids. Registration and modeling errors of this model are being reduced by smoothing the border between virtual world and occluding real object. An implementation in our augmented environment and the resulting improvements are presented.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 204, 205, 403, 249 ], "number": "TR-186-2-98-29", "pages_from": "1", "pages_to": "14", "research_areas": [], "keywords": [ "occlusion", "augmented reality", "virtual reality" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Fuhrmann-1998-Occ-paper.pdf", "type": "application/pdf", "size": 169363, "path": "Publication:Fuhrmann-1998-Occ", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Fuhrmann-1998-Occ/Fuhrmann-1998-Occ-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Fuhrmann-1998-Occ/", "__class": "Publication" }, { "id": "Schmalstieg-1998-Usi", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Using Transparent Props for Interaction with the Virtual\nTable", "date": "1998-10", "abstract": "The Virtual Table presents stereoscopic graphics to a user\nin a workbench-like setting. This paper reports on a user interface and new\ninteraction techniques for the Virtual Table based on transparent props?a\ntracked hand-held pen and a pad. These props, but in particular the pad,\nare augmented with 3D graphics from the Virtual Table?s display. This\nconfiguration creates a very powerful and flexible interface for two-handed\ninteraction that can be applied to other back-projected stereographic\ndisplays as well: the pad can serve as a palette for tools and controls as\nwell as a window-like see-through interface, a plane-shaped and\nthrough-the-plane tool, supporting a variety of new interaction techniques.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 375, 234 ], "number": "TR-186-2-98-25", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "magic lenses", "window tools", "transparent props", "two-handed interaction", "augmented reality", "virtual reality" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1998-Usi-paper.pdf", "type": "application/pdf", "size": 479921, "path": "Publication:Schmalstieg-1998-Usi", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Schmalstieg-1998-Usi/Schmalstieg-1998-Usi-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Schmalstieg-1998-Usi/", "__class": "Publication" }, { "id": "Loeffelmann-1998-SMURF", "type_id": "techreport", "tu_id": null, "repositum_id": null, "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, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 175, 197, 166 ], "number": "TR-186-2-98-26", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "surfaces", "visualization" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Loeffelmann-1998-SMURF-paper.gz", "type": "application/octet-stream", "size": 1299140, "path": "Publication:Loeffelmann-1998-SMURF", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-SMURF/Loeffelmann-1998-SMURF-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-SMURF/", "__class": "Publication" }, { "id": "Wilkie-1998-Ase", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "A Spectral Extension to the Tag Image File Format", "date": "1998-10", "abstract": "We propose a simple, consistent and yet powerful extension to the Tagged Image File Format (commonly referred to as TIFF) that enables the user to store spectral image data.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 192, 216, 190 ], "number": "TR-186-2-98-28", "pages_from": "1", "pages_to": "7", "research_areas": [], "keywords": [ "image file format", "spectral rendering" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Wilkie-1998-Ase-paper.gz", "type": "application/octet-stream", "size": 59429, "path": "Publication:Wilkie-1998-Ase", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Wilkie-1998-Ase/Wilkie-1998-Ase-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Wilkie-1998-Ase/", "__class": "Publication" }, { "id": "Mastal-1998-Rad", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Radiosity--Calculations for Rotational Surfaces", "date": "1998-10", "abstract": "Rotational Surfaces are very important for photorealistic representations of plants and other natural phenomena. In this paper radiosity calculations for rotational surfaces are presented that handle surfaces as whole objects rather than approximating them by large numbers of plane patches. Mathematical expressions are given for the radiance of cylinders, cones and spheres that are ideal Lambertian reflectors. Although there exists no complete radiosity algorithm which uses the formulae for cylinders, cones and spheres at the moment, it can be estimated that the number of objects of a global illumination scene as well as the number of interactions could be reduced dramatically. Therefore it should be possible to render more complex scenes with plants, like forests, in reasonable time.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 220, 216, 190 ], "number": "TR-186-2-98-27", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "natural phenomena", "rotational surfaces", "radiosity" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Mastal-1998-Rad-paper.gz", "type": "application/octet-stream", "size": 67131, "path": "Publication:Mastal-1998-Rad", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mastal-1998-Rad/Mastal-1998-Rad-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mastal-1998-Rad/", "__class": "Publication" }, { "id": "Tobler-1998-DPO", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Designing a Parallel Object Oriented Graphics Framework", "date": "1998-09", "abstract": "This paper aims to present a design strategy for\ngraphics frameworks, that facilitates easy parallelization. This is\nachieved by introducing two mechanisms for dealing with the main\nissues of parallelization, that can be seamlessly integrated into\ngraphics frameworks which have been designed adhering to a few\nimplementation rules. These two main mechanisms are Remote\nAccess Nodes, that mainly deal with memory distribution and memory\naccess, and Parallelizing Group Nodes, that deal with task\ngeneration and load balancing. These objects are designed to fit into\nobject oriented, scene--graph based frameworks, which can be used as\na basis for most graphics based algorithms.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 216 ], "number": "TR-186-2-98-34", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "Object-Oriented Design", "Parallelization", "Graphics Framework" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Tobler-1998-DPO-paper.gz", "type": "application/octet-stream", "size": 66801, "path": "Publication:Tobler-1998-DPO", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Tobler-1998-DPO/Tobler-1998-DPO-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Tobler-1998-DPO/", "__class": "Publication" }, { "id": "Szir-1998-Stoch", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Stochastic Iteration for Non-diffuse Global Illumination", "date": "1998-08", "abstract": "This paper presents a single-pass, view-dependent method to solve t\nhe\nrendering equation, using a stochastic iterational scheme where\nthe transport operator is selected randomly in each iteration.\nThe requirements of convergence are given for the general case.\nTo demonstrate the basic idea, a very simple, continuous\nrandom transport\noperator is examined, which gives back the light tracing\nalgorithm incorporating Russian roulette.\nThen, a new mixed continuous and finite-element based\niteration method is proposed, which uses\nray-bundles to transfer the radiance in single random direction.\nThe resulting algorithm is fast, it provides initial results in seconds\nand accurate solutions in minutes and\ndoes not suffer from the error accumulation problem and\nthe high memory demand of other\nfinite-element and hierarchical approaches.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 206 ], "number": "TR-186-2-98-21", "pages_from": "1", "pages_to": "15", "research_areas": [], "keywords": [ "global ray-bundle tracing", "light-tracing", "Monte-Carlo Carlo integration", "global radiance", "Rendering equation" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-Stoch-paper.gz", "type": "application/octet-stream", "size": 3946749, "path": "Publication:Szir-1998-Stoch", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Stoch/Szir-1998-Stoch-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Stoch/", "__class": "Publication" }, { "id": "Szir-1998-STAR", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Stochastic Methods in Global Illumination - State of the Art Report", "date": "1998-08", "abstract": "This paper presents a state of the art report of those global illum\nination\nalgorithms which involve Monte-Carlo or quasi-Monte Carlo techniques.\nFirst it surveys the basic tasks of global illumination, which\ncan be formulated as the solution of either the rendering or the\npotential equation, then reviews the basic solution techniques,\nincluding inversion, expansion and iteration. The paper\nexplains why stochastic approaches are good to solve these\nintegral equations and highlights what kind of fundamental\nchoices we have when designing such an algorithm. It\ncompares, for example,\nfinite-element and continuous methods, pure Monte-Carlo and\nquasi-Monte Carlo techniques, different versions of importance sampling,\nRussian roulette, local and global visibility algorithms, etc.\nThen, a lot of methods are reviewed in a unified framework,\nthat also allows to make comparisons.\n", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 206 ], "number": "TR-186-2-98-23", "pages_from": "1", "pages_to": "29", "research_areas": [], "keywords": [ "error and complexity", "first-shot", "transillumination method", "stochastic ray-radiosity", "global ray-bundle tracing", "instant radiosity", "photon-map", "bi-directional path tracing", "light tracing", "photon tracing", "path tracing", "distributed ray-tracing", "Metropolis sampling", "stochastic iteration", "shooting and gathering random walks", "Russian roulette", "importance sampling", "radiosity", "finite-element techniques", "Monte-Carlo and quasi-Monte Carlo quadra", "potential equation", "Rendering equation" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-STAR-paper.gz", "type": "application/octet-stream", "size": 213405, "path": "Publication:Szir-1998-STAR", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-STAR/Szir-1998-STAR-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-STAR/", "__class": "Publication" }, { "id": "Szir-1998-QMC", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": " Analysis of the Quasi-Monte Carlo Integration of the Rendering Equation", "date": "1998-08", "abstract": "Quasi-Monte Carlo integration is said to be better than\nMonte-Carlo integration since its error bound can be in the\norder of $O(N^{-(1-\\epsilon)})$ instead of the $O(N^{-0.5})$\nprobabilistic bound of classical Monte-Carlo integration if the\nintegrand has finite variation. However, since in computer graphics\nthe integrand of the rendering equation is usually discontinous\nand thus has infinite variation, the superiority of quasi-Monte\nCarlo integration has not been theoretically justified. This\npaper examines the integration of discontinuous functions using\nboth theoretical arguments and simulations and explains what\nkind of improvements can be expected from the quasi-Monte Carlo\ntechniques in computer graphics.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 206, 190 ], "number": "TR-186-2-98-24", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "Hardy-Krause vari ation", "quasi-Monte Carlo quadrature", "Rendering equation" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-QMC-paper.gz", "type": "application/octet-stream", "size": 70135, "path": "Publication:Szir-1998-QMC", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-QMC/Szir-1998-QMC-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-QMC/", "__class": "Publication" }, { "id": "Szir-1998-Glo", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Global Ray-bundle Tracing", "date": "1998-07", "abstract": "The paper presents a single-pass, view-dependent method to solve th\ne general\nrendering equation, using a combined finite element and random\nwalk approach. Applying finite element techniques, the\nsurfaces are decomposed into planar patches on which the\nradiance is assumed to be combined from finite number of unknown\ndirectional radiance functions by predefined positional basis functions.\nThe directional radiance functions are then computed by\nrandom walk or by stochastic iteration using bundles of parallel rays.\nTo compute the radiance transfer in a single direction,\nseveral global visibility methods are considered, including\nthe global versions of the painter's, z-buffer, Weiler-Atherton's\nand planar graph based algorithms.\nThe method requires\nno preprocessing except for handling point lightsources, for\nwhich a first-shot technique is proposed.\nThe new method is particularly\nefficient for scenes including not very specular materials\nilluminated by large area lightsources or sky-light.\nIn order to increase the speed for difficult lighting situations,\nwalks can be selected\naccording to their importance. The importance can be explored adaptively\nby the Metropolis and VEGAS sampling techniques.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 206 ], "number": "TR-186-2-98-18", "pages_from": "1", "pages_to": "28", "research_areas": [], "keywords": [ "z-buffer", "Metropolis method", "importance sampling", "stochastic iteration", "Monte-Carlo and quasi-Monte Carlo integr", "global radiance", "Rendering equation" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-Glo-paper.gz", "type": "application/octet-stream", "size": 4977218, "path": "Publication:Szir-1998-Glo", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Glo/Szir-1998-Glo-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Glo/", "__class": "Publication" }, { "id": "Szir-1998-Obj", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Object-Oriented Framework and Methodology to Process Visualisation\nSystem Development", "date": "1998-07", "abstract": "In this paper a process visualisation development system and its\nassociated development methodology are presented.\nThis methodology is optimised to systems that\nhave complex structure and are built of large number of components\nbelonging to relatively small number of types.\nIn order to handle the complexity, the input requirements of the method\nis as close to the \"native language\" of the application as possible.\nThe elements of the \"native language\" are assumed to include\nengineering drawings and manuals describing the operation of\ncomponent types the system is built of. Graphics techniques are\nused to supply the engineering drawings into the development\nsystem while not only the required visual appearance is described\nbut the structure of the underlying system is also defined.\nThe elements of engineering drawings are dynamized to animate\nthe graphics presentation to reflect the current state\nof the monitored system. Component manuals are transformed to interface\nand state definitions from which a code generator generates a C++ class\nfor each component type. This C++ class must be tuned to reflect\nthe operation of a single component type.\n>From these definitions the development system automatically builds up\nthe complete visualisation program, providing easy and fast\napplication development.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 206 ], "number": "TR-186-2-98-19", "pages_from": "1", "pages_to": "25", "research_areas": [], "keywords": [ "model-view-controller paradigm", "object-oriented design", "process visualisation development system" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-Obj-paper.gz", "type": "application/octet-stream", "size": 305611, "path": "Publication:Szir-1998-Obj", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Obj/Szir-1998-Obj-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Obj/", "__class": "Publication" }, { "id": "Szir-1998-Pump", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Analysis and Pumping of the Albedo Function", "date": "1998-07", "abstract": "The paper\nintroduces a method, called the albedo pumping-up, to derive\nnew, physically plausible BRDFs from an existing\none or from any symmetric function.\nThis operation can be applied recursively\nby arbitrary number of times. An important application\nof this operation is the transformation of the Phong and\nBlinn models in order to make them produce\nmetallic effects.\nThe paper also examines the albedo function\nof reflectance models and comes to the conclusion\nthat widely used models violate\nenergy balance at grazing angles.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 232, 206 ], "number": "TR-186-2-98-20", "pages_from": "1", "pages_to": "13", "research_areas": [], "keywords": [ "perceptual based fitting", "metal models", "energy balance", "albedo function", "BRDF representation", "Reflectance function" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-Pump-paper.gz", "type": "application/octet-stream", "size": 530217, "path": "Publication:Szir-1998-Pump", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Pump/Szir-1998-Pump-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Pump/", "__class": "Publication" }, { "id": "Szir-1998-Ref", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "New Simple Reflectance Models for Metals and other Specular Materia\nls", "date": "1998-07", "abstract": "The paper presents new, simple and physically\nplausible, but not physically based reflectance models for\nmetals and other specular materials. The\nmost important member of this family is the modification\nof the Phong model, which can eliminate its\nnon-metallic characteristics. The new model gives back the\nideal mirror in\nthe limit case, is easier to compute than other known models\nand is particularly suitable for importance sampling to\nefficiently generate reflected directions\nin Monte-Carlo ray-tracing algorithms.\nDue to its simplicity, the new\nmodel can become an integral part of commercial CAD systems to\ndescribe the specular part or metallic behavior.\nThe paper also examines the energy balance of the previously\nknown and the newly proposed BRDFs concentrating on the behavior\nat grazing angles, and comes to the conclusion that the Ward and\nthe Cook-Torrance models cannot guarantee energy balance and thus\nare not physically plausible. Finally, the generated images\ndemonstrate how the metallic impression can be provided by the\nnew models.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 232, 206 ], "number": "TR-186-2-98-17", "pages_from": "1", "pages_to": "15", "research_areas": [], "keywords": [ "importance sampling", "albedo function", "BRDF representation", "Reflectance function" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-Ref-paper.gz", "type": "application/octet-stream", "size": 2964360, "path": "Publication:Szir-1998-Ref", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Ref/Szir-1998-Ref-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Ref/", "__class": "Publication" }, { "id": "Berger-1998-Col", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Color-Table Animation of Fast Oriented Line Integral\nConvolution\n \t\t\t\t for Vector Field Visualization", "date": "1998-07", "abstract": "Fast Oriented Line Integral Convolution (FROLIC), which is\na variant\nof LIC, illustrates 2D vector fields by approximating a\nstreamlet by\na set of disks with varying intensity. FROLIC does not only\nshow the\ndirection of the flow but also its orientation.\nThis paper presents color-table animation of FROLIC images.\nVarious\ncolor-table compositions are discussed in detail. When\nanimating\nFROLIC images visual artifacts (pulsation, synchronization)\nmust be\navoided. Several strategies in this respect are dealt with.\nColor-table animation of FROLIC has been implemented as\nVisual C++\napplication for Windows NT, whereby the calculation of the\ndynamical\nsystem is performed with Mathematica. This allows\nresearchers from\nvarious disciplines to conveniently explore and investigate\n \t\tanalytically defined 2D and 3D vector fields.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 405, 166 ], "number": "TR-186-2-98-22", "pages_from": "1", "pages_to": "19", "research_areas": [], "keywords": [ "color-table animation", "Line Integral Convolution", "FROLIC" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Berger-1998-Col-paper.pdf", "type": "application/pdf", "size": 765400, "path": "Publication:Berger-1998-Col", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Berger-1998-Col/Berger-1998-Col-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Berger-1998-Col/", "__class": "Publication" }, { "id": "Tobler-1998-FFA", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "A new Form Factor Analogy and its Application to\nStochastic Global Illumination Algorithms", "date": "1998-06", "abstract": "A new form factor analogy, that has been derived\nfrom results of integral geometry, is introduced. The new analogy is\nshown to be useful for stochastic evaluation of the local form of the\nrendering equation used in various Monte Carlo methods for calculating\nglobal illumination. It makes it possible to improve importance\nsampling in these methods, thereby speeding up convergence. A new\nclass of bidirectional reflection distribution functions that directly\nbenefits from the analogy and permits exact evaluation and\ncalculation of correctly distributed vectors for Monte Carlo\nintegration is presented.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 216, 177, 207, 190 ], "number": "TR-186-2-98-33", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "Sampling", "BRDF", "Global Illumination" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Tobler-1998-FFA-paper.gz", "type": "application/octet-stream", "size": 304660, "path": "Publication:Tobler-1998-FFA", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Tobler-1998-FFA/Tobler-1998-FFA-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Tobler-1998-FFA/", "__class": "Publication" }, { "id": "fuhrmann-1998-reaX", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Real-TimeTechniques for 3D Flow Visualization", "date": "1998-05", "abstract": "Visualization of three dimensional flow has to overcome a lot of problems to be effective. Among them are occlusion of distant details, lack of directional and depth hints and cluttering. In this paper we present methods which address these problems for realtime graphic representations applicable in virtual environments. We use animated, opacity-mapped streamlines as visualization icon for 3D flow visualization. We present a texture mapping technique to keep the level of texture detail along a streamline nearly constant even when the velocity of the flow varies considerably. An algorithm is described which distributes the dashtubes evenly in space. We apply magic lenses and magic boxes as interaction techniques for investigating densly filled areas without overwhelming the observer with visual detail. Implementation details of these methods and their integration in our virtual environment conclude the paper.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 204, 166 ], "number": "TR-186-2-98-16", "pages_from": "1", "pages_to": "7", "research_areas": [], "keywords": [ "focussing", "virtual reality", "texture techniques", "flow visualization", "realtime" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "fuhrmann-1998-reaX-paper.pdf", "type": "application/pdf", "size": 343680, "path": "Publication:fuhrmann-1998-reaX", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/fuhrmann-1998-reaX/fuhrmann-1998-reaX-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/fuhrmann-1998-reaX/", "__class": "Publication" }, { "id": "Mantler-1998-DynX", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Dynamic Load Balancing in Distributed Virtual Environments", "date": "1998-04", "abstract": "This paper introduces a new approach for improving the scalability of distributed virtual environments by using a combination of visibility culling for communication and dynamic load balancing to keep the system load evenly distributed. Further communication optimizations as well as some preliminary results are presented.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 407, 202 ], "number": "TR-186-2-98-13", "pages_from": "1", "pages_to": "2", "research_areas": [], "keywords": [ "Collaboration", "Load Balancing Distributed System", "Network", "Virtual Reality" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Mantler-1998-DynX-paper.gz", "type": "application/octet-stream", "size": 37588, "path": "Publication:Mantler-1998-DynX", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mantler-1998-DynX/Mantler-1998-DynX-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mantler-1998-DynX/", "__class": "Publication" }, { "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, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 184, 399, 166 ], "number": "TR-186-2-98-14", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "interactivity", "visualization over the internet" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Mroz-1998-Bri-paper.gz", "type": "application/octet-stream", "size": 46564, "path": "Publication:Mroz-1998-Bri", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mroz-1998-Bri/Mroz-1998-Bri-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mroz-1998-Bri/", "__class": "Publication" }, { "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, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 184, 399, 166 ], "number": "TR-186-2-98-15", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "augmented reality,information visualizat", "web technologies", "Visualization" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Mroz-1998-SelX-paper.gz", "type": "application/octet-stream", "size": 1274065, "path": "Publication:Mroz-1998-SelX", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mroz-1998-SelX/Mroz-1998-SelX-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mroz-1998-SelX/", "__class": "Publication" }, { "id": "Hesina-1998-ANEX", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "A Network Architecture for Remote Rendering", "date": "1998-04", "abstract": "Internet-based virtual environments (VEs) let users explore\nmultiple virtual\nworlds with many different geometric models which are downloaded rather than\npre-distributed. To avoid long download times, we have developed a method that\noptimally utilizes network bandwidth by downloading only the exact portion of\ngeometry that is necessary for rendering. The solution is based on progressive\ngeometry data structures (smooth levels of detail) and selective download.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 205, 202 ], "number": "TR-186-2-98-02", "pages_from": "1", "pages_to": "4", "research_areas": [], "keywords": [ "distributed virtual environments", "smooth levels of details", "remote rendering" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Hesina-1998-ANEX-paper.pdf", "type": "application/pdf", "size": 133635, "path": "Publication:Hesina-1998-ANEX", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Hesina-1998-ANEX/Hesina-1998-ANEX-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Hesina-1998-ANEX/", "__class": "Publication" }, { "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.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 212, 166 ], "number": "TR-186-2-98-09", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "visualization", "dynamical systems", "critical points", "vector field topology" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Loeffelmann-1998-VDS-paper.gz", "type": "application/octet-stream", "size": 790794, "path": "Publication:Loeffelmann-1998-VDS", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-VDS/Loeffelmann-1998-VDS-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-VDS/", "__class": "Publication" }, { "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, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 408, 197, 399, 166 ], "number": "TR-186-2-98-12", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "volume rendering", "multi-modal and multi-dimensional data v", "visualization systems", "visualization of medical data" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Castro-1998-TFS-paper.gz", "type": "application/octet-stream", "size": 1213209, "path": "Publication:Castro-1998-TFS", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Castro-1998-TFS/Castro-1998-TFS-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Castro-1998-TFS/", "__class": "Publication" }, { "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.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166, 399, 165 ], "number": "TR-186-2-98-07", "pages_from": "1", "pages_to": "18", "research_areas": [], "keywords": [ "visualization", "dynamical systems" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Groeller-1998-VDS-paper.pdf", "type": "application/pdf", "size": 3922828, "path": "Publication:Groeller-1998-VDS", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-VDS/Groeller-1998-VDS-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-VDS/", "__class": "Publication" }, { "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. ", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166, 399, 165 ], "number": "TR-186-2-98-06", "pages_from": "1", "pages_to": "31", "research_areas": [], "keywords": [ "visualization", "dynamical systems" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Groeller-1998-VAD-paper.pdf", "type": "application/pdf", "size": 2696574, "path": "Publication:Groeller-1998-VAD", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-VAD/Groeller-1998-VAD-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-VAD/", "__class": "Publication" }, { "id": "Groeller-1998-TunVis", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "TunVis: Visualizing specific geologic features for\ntunnel planning and construction", "date": "1998-02", "abstract": "This paper describes a method and a system for visualizing a\nvirtual tunnel through an existing geologic formation and a\nmethod for the generation of a camera animation along the tunnel\naxis. The tunnel is built from geologic data coming from vertical\nsample drills from the mountain top along the selected tunnel axis.\nIts wire frame model is then edited by a geologist and image\ninformation of the rock appearance is textured onto the tunnel\nwall, resulting in a photorealistic representation of the expected\ngeologic rock formations. Finally a camera animation and video\noptions are defined to render a video sequence of the camera\n movement.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 412, 165, 166 ], "number": "TR-186-2-98-08", "pages_from": "1", "pages_to": "12", "research_areas": [], "keywords": [ "visualization", "geologic features", "tunnel planning" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Groeller-1998-TunVis-paper.pdf", "type": "application/pdf", "size": 463507, "path": "Publication:Groeller-1998-TunVis", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-TunVis/Groeller-1998-TunVis-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-TunVis/", "__class": "Publication" }, { "id": "Kopp-1998-IDD", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Interleaved Dimension Decomposition", "date": "1998-01", "abstract": "Wavelets in 2D or higher dimensions are often\ngenerated by a decomposition scheme from 1D wavelets. There are two\ndecomposition schemes called the standard and the nonstandard\ndecomposition which are used in most applications of higher\ndimensional wavelets. This paper introduces a new decomposition\nmethod, the interleaved dimension decomposition and compares its\nadvantages and disadvantages with the other decompositions. Based\non the properties of the interleaved dimension decomposition,\napplications to computer graphics are sketched including\nmultiresolution painting, morphing in 2D and 3D, and image\ncompression.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 413, 190 ], "number": "TR-186-2-98-03", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "Wavelets", "morphing", "multiresolution painting", "image compression" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Kopp-1998-IDD-paper.pdf", "type": "application/pdf", "size": 202245, "path": "Publication:Kopp-1998-IDD", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Kopp-1998-IDD/Kopp-1998-IDD-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Kopp-1998-IDD/", "__class": "Publication" }, { "id": "Szalavari-1998-CGAR", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Collaborative Gaming in Augmented Reality", "date": "1998-01", "abstract": "We introduce a local collaborative environment for gaming.\nIn our setup multiple users can interact with the virtual game and the real\nsurroundings at the same time. They are able to communicate with other\nplayers during the game. We describe an augmented reality setup for\nmultiple users with see-trough head-mounted displays, allowing dedicated\nstereoscopic views and individualized interaction for each user. We use\nface-snapping for fast and precise direct object manipulation. With face\nsnapping and the subdivision of the gaming space into spatial regions, the\nsemantics of actions can be derived out of geometric actions of the user.\nFurther, we introduce a layering concept allowing individual views onto the\ncommon data structure. The layer concept allows to make privacy management\nvery easy by simply manipulating the common data structure. Moreover,\nassigning layers to spatial regions carefully, a special privacy management\nis often not necessary. Moving objects from one region into another will\nautomatically change their visibility and privacy for each participant. We\ndemonstrate our system with two example board-games: Virtual Roulette and\nMah-Jongg, both relying heavily on social communication and the need of a\nprivate space.\n", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 234, 410, 249 ], "number": "TR-186-2-98-10", "pages_from": "1", "pages_to": "19", "research_areas": [], "keywords": [ "augmented reality", "interaction techniques", "CSCW", "virtual gaming" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szalavari-1998-CGAR-paper.pdf", "type": "application/pdf", "size": 2463020, "path": "Publication:Szalavari-1998-CGAR", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szalavari-1998-CGAR/Szalavari-1998-CGAR-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szalavari-1998-CGAR/", "__class": "Publication" }, { "id": "Koenig-1998-NC", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Real Time Simulation and Visualization of NC Milling\nProcesses for Inhomogeneous Materials on Low-End Graphics Hardware", "date": "1998-01", "abstract": "Simulation and visualization of NC milling processes\nhas become an\nimportant step in computer aided manufacturing. The usage of stock\nmaterials with specific locally varying properties (like density,\naccuracy, color, ...) becomes more and more important with new\ntechnologies emerging in the material industry. Our new approach,\nusing volumetric representation, has been adapted to this needs and\ncopes with inhomogeneous material properties. Taking color as one\npossible material property, our approach enables the visualization\nof milled wood or compound materials.\nFurthermore, our approach has been developed with the usage of\nlow-end graphics hardware in mind. The algorithms have been\noptimized to ensure interactive update rates even on standard\npersonal computers without hardware graphics acceleration.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 197, 166 ], "number": "TR-186-2-98-04", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "visualization", "NC milling" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Koenig-1998-NC-paper.gz", "type": "application/octet-stream", "size": 2275863, "path": "Publication:Koenig-1998-NC", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Koenig-1998-NC/Koenig-1998-NC-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Koenig-1998-NC/", "__class": "Publication" }, { "id": "Loeffelmann-1998-EVC", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Enhancing the Visualization of Characteristic Structures\n\t in Dynamical Systems", "date": "1998-01", "abstract": "We present a thread of streamlets as a new\ntechnique to visualize\ndynamical systems in three-space. A trade-off is made between\nsolely visualizing a mathematical abstraction through\nlower-dimensional manifolds, i.e., characteristic structures such\nas fixed point, separatrices, etc., and directly encoding\nthe flow through stream lines or stream surfaces. Bundlers of\nstreamlets are\nselectively placed near characteristic trajectories.\nAn over-population of phase space with occlusion problems as a\nconsequence is omitted. On the other hand, information loss\nis minimized since characteristic structures of the flow are still\n illustrated in the visualization.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 166 ], "number": "TR-186-2-98-05", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "visualization", "dynamical systems" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Loeffelmann-1998-EVC-paper.gz", "type": "application/octet-stream", "size": 1398615, "path": "Publication:Loeffelmann-1998-EVC", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-EVC/Loeffelmann-1998-EVC-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-EVC/", "__class": "Publication" }, { "id": "Fuhrmann-1998-CVA", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Collaborative Visualization in Augmented Reality", "date": "1998-01", "abstract": "STUDIERSTUBE is an augmented reality system that has\nseveral advantages over conventional desktop and other virtual\nreality environments, including true stereoscopy, 3D-interaction,\nindividual viewpoints and customized views for multiple users,\nunhindered natural collaboration and low cost. We demonstrate the\napplication of this concept for the interaction of multiple users\nand illustrate it with several visualizations of dynamical systems\nin DynSys3D, a visualization system running on top of AVS. We also\nshow how the integration of AR into a commercial visualization\nsystem can be achieved. Several examples constructed in DynSys3D -\ndeveloped for the visualization of complex dynamical systems in\nAVS - will complement the presentation.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 204, 249, 399, 202 ], "number": "TR-186-2-98-01", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "Visualization", "Augmented Reality" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Fuhrmann-1998-CVA-paper.pdf", "type": "application/pdf", "size": 637112, "path": "Publication:Fuhrmann-1998-CVA", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Fuhrmann-1998-CVA/Fuhrmann-1998-CVA-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Fuhrmann-1998-CVA/", "__class": "Publication" }, { "id": "Szalavari-1998-Col", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Collaborative Gaming in Augmented Reality, Proceedings of VRST'98, pp.195-204, November 2-5, 1998", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 234, 249, 410 ], "note": "", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szalavari-1998-Col/", "__class": "Publication" }, { "id": "Tobler-1998-Lin", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Linearly Combining Shading Models for Texturing in Global Illumination Algorithms", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 145, 190, 216 ], "note": "In Proceedings of the WinterSchool of Computer Graphics, Plzen, Czech Republic, February 1998.", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Tobler-1998-Lin/", "__class": "Publication" }, { "id": "Szalavari-1998-Aug", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Augmented Reality Enabled Collaborative Work in \"Studierstube\"", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 204, 234, 249 ], "note": "Abstract, EURO-VR'97 conference, Amsterdam, The Netherlands, Nov. 10-11, 1998.", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szalavari-1998-Aug/", "__class": "Publication" }, { "id": "Schoenhacker-1998-Pre", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Presenting Dynamic Tactile Bitmap Graphics Using a Standard Braille Character Glyph Display", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 136 ], "note": "in: A.D.N. Edwards, A. Arato, W. Zagler (eds.), Computers and Assistive Technology - ICCHP'98, Proceedings of the XV. IFIP World Computer Congress, 31 August - 4 September 1998, Vienna/Austria and Budapest/Hungary, OCG Schriftenreihe Band 118, pp.141-147.

Paluszny, M., Buehler, K.: Canal surfaces and inversive geometry. (English) Daehlen, Morten (ed.) et al., Mathematical methods for curves and surfaces II. Nashville, TN: Vanderbilt Univ. Press. 367-374 (1998). MSC 1991: *65D17", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Schoenhacker-1998-Pre/", "__class": "Publication" }, { "id": "xmas-1998", "type_id": "xmascard", "tu_id": null, "repositum_id": null, "title": "X-Mas 1998", "date": "1998", "abstract": "Die Schneeflocken wurden mit ART (Advanced Rendering Toolkit), einem am Institut fur Computergraphik entwickelten Programmsystem zur Berechnung von realistischen Bildern, erzeugt. Als Vorlage dienten Photos von echten Schneeflocken. Die sichtbaren Farbeffekte entstehen durch physikalisch korrekte Simulation der Lichtbrechung. Dieses Bild ist auch in seiner vollen Auflösung von 1536x1024 im von Greg Larson et al. eingeführten TIFF LogLuv-Format zum Download bereit (es unterstützen leider erst sehr wenige Programme diese Erweiterung des TIFF-Formates).\r\n\r\nThis image was rendered with the spectral ray tracer of ART, the Advanced Rendering Toolkit, a software package for rendering realistic images developed at the Institute of Computer Graphics. The snowflakes have been modelled based on photos of real snowflakes. The colour effects are due to the use of a physically correct simulation of light dispersion. You can also download this image in the high dynamic range TIFF LogLuv image format developed by Greg Larson et al. in full 1536x1024 resolution here (note that most programs are not yet able to view this extension to the TIFF format).", "authors_et_al": false, "substitute": null, "main_image": { "description": "", "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 1536, "image_height": 1024, "name": "xmas-1998-image.png", "type": "image/png", "size": 2616280, "path": "Publication:xmas-1998", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/xmas-1998/xmas-1998-image.png", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1998/xmas-1998/xmas-1998-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 192 ], "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": "", "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 1536, "image_height": 1024, "name": "xmas-1998-image.png", "type": "image/png", "size": 2616280, "path": "Publication:xmas-1998", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/xmas-1998/xmas-1998-image.png", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1998/xmas-1998/xmas-1998-image:thumb{{size}}.png" }, { "description": "", "filetitle": "LogLuv", "main_file": false, "use_in_gallery": false, "access": "public", "image_width": 1536, "image_height": 1024, "name": "xmas-1998-LogLuv.tiff", "type": "image/tiff", "size": 3084876, "path": "Publication:xmas-1998", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/xmas-1998/xmas-1998-LogLuv.tiff", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1998/xmas-1998/xmas-1998-LogLuv:thumb{{size}}.png" } ], "projects_workgroups": [ "xmas" ], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/xmas-1998/", "__class": "Publication" }, { "id": "Schmalstieg-1998-Stu", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Studierstube - An Environment for Collaboration in Augmented Reality", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 204, 234, 249 ], "note": "Virtual Reality - Systems, Development and Applications, Vol. 3, No. 1, pp. 37-49, 1998.", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Schmalstieg-1998-Stu/", "__class": "Publication" }, { "id": "Schmalstieg-1998-ATr", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "A Transparent Personal Interaction Panel for the Virtual Table", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 375 ], "note": "Computergraphik Topics, pp. 19-20, Vol. 10., No. 5, Fraunhofer Gesellschaft, Darmstadt, Germany, 1998.", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Schmalstieg-1998-ATr/", "__class": "Publication" }, { "id": "Raidl-1998-Gen", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Genetic Algorithms for the Multiple Container Packing Problem", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 147, 150 ], "note": "Proc. of the 5th Int. Conference on Parallel Problem Solving from Nature, Amsterdam, The Netherlands, Springer LNCS 1498, pp. 875-884, September 1998.", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Raidl-1998-Gen/", "__class": "Publication" }, { "id": "Raidl-1998-Evo", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Evolutionary Optimized Tensor Product Bernstein Polynomials versus Backpropagation Networks", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 147, 150 ], "note": "Proc. of the Int. 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