[ { "id": "Faisstnauer-1995-TLH", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Tracker Library: Handling VR Input Devices", "date": "1995-12", "abstract": "When building immersive virtual environments, it is\nnecessary to track the user´s head to determine its\ndirection of gaze, as well as other parts of the\nbody, for example hands to allow interaction.\nTherefore a tracking device is needed. Trackers\nusually consist of a stationary part, called\nemitter, and one or more small movable parts, called\nreceivers or sensors, which are mounted on the\npoints to track and whose position and orientation\ncan be determined by the tracking device.\nThe Tracker Library, described in this paper, is a\ndevice driver that allows to easy configure the\ntracker and retrieve the position and orientation\n\t\t data required.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 230, 238 ], "number": "TR-186-2-95-18", "pages_from": "1", "pages_to": "21", "research_areas": [], "keywords": [ "virtual environments", "tracking" ], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Faisstnauer-1995-TLH/", "__class": "Publication" }, { "id": "Tobler-1995-AAC", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "ACSGM -- An adaptive CSG meshing algorithm", "date": "1995-12", "abstract": "We present a new algorithm, called ACSGM (which is short\nfor Adaptive CSG Mesher), that converts scenes in CSG\nrepresentation into a boundary representation composed of\ntriangles. The algorithm is based on the marching cubes\nalgorithm, but instead of working at a fixed resolution, the\nsize of the cubes used in the meshing process is changed\nadaptively. While the marching cubes algorithm, which\ncalculates the vertices of the triangles of the final mesh\nusing linear interpolation, ACSGM uses ray casting for this\ncomputation. This approach not only produces exact vertices\nbut provides some additional information (e.g.\\ the normal\nvectors in these vertices) that can be used to generate a\nmore accurate approximation of the CSG object by the final\n mesh.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 216, 437, 190 ], "number": "TR-186-2-95-13", "pages_from": "1", "pages_to": "15", "research_areas": [ "Geometry" ], "keywords": [ "CSG", "meshing", "hierarchical" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Tobler-1995-AAC-paper.gz", "type": "application/octet-stream", "size": 61934, "path": "Publication:Tobler-1995-AAC", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Tobler-1995-AAC/Tobler-1995-AAC-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Tobler-1995-AAC/", "__class": "Publication" }, { "id": "Groeller-1995-GOW", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "The Geometry of Wonderland", "date": "1995-12", "abstract": "We analyze Wonderland - a model of demographic,economic\nand environmental interactions\n- by combining numerical simulations with basic ideas of\ngeometric singular perturbation theory. This theory dealing\nwith slow-fast dynamical systems helps us to gain new\ninsights into the system's behaviour. We give conditions\nfor the occurrence of rapid environmental changes in\nWonderland. Since the chosen approach is inherently geometric\n\t\twe also focus on the visualization of our results.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166, 165, 417, 430, 431, 432 ], "number": "TR-186-2-95-17", "pages_from": "1", "pages_to": "21", "research_areas": [], "keywords": [ "dynamical system", " visualization" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Groeller-1995-GOW-paper.gz", "type": "application/octet-stream", "size": 781751, "path": "Publication:Groeller-1995-GOW", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-GOW/Groeller-1995-GOW-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-GOW/", "__class": "Publication" }, { "id": "Tobler-1995-BGD", "type_id": "techreport", "tu_id": null, "repositum_id": null, "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.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 216, 399, 437, 190 ], "number": "TR-186-2-95-07", "pages_from": "1", "pages_to": "7", "research_areas": [ "Geometry" ], "keywords": [ "data structure", "C++", "geometric modeling" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Tobler-1995-BGD-paper.gz", "type": "application/octet-stream", "size": 20632, "path": "Publication:Tobler-1995-BGD", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Tobler-1995-BGD/Tobler-1995-BGD-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Tobler-1995-BGD/", "__class": "Publication" }, { "id": "Schmalstieg-1995-OCD", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Optimizing Communication in Distributed Virtual Environments\n\t\tby Specialized Protocols", "date": "1995-11", "abstract": "We present a set of protocols designed to be used for\nspecial communication needs in client-server based virtual\nenvironments. They address simulation, animation, interaction\nand VE authoring, and can be combined as needed for multiple\nlevels of participation in the VE. Separating these tasks in\ndifferent optimized protocols leads to more efficiency in\n\t\tusing the given bandwidth of todays computer networks.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 249, 435 ], "number": "TR-186-2-95-14", "pages_from": "1", "pages_to": "6", "research_areas": [], "keywords": [ "virtual reality", "virtual environments", "communication", "network protocols", "distributed graphics", "client-server architectures" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1995-OCD-paper.gz", "type": "application/octet-stream", "size": 44829, "path": "Publication:Schmalstieg-1995-OCD", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-OCD/Schmalstieg-1995-OCD-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-OCD/", "__class": "Publication" }, { "id": "Schmalstieg-1995-CHI", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Constructing a Highly Immersive Virtual Environment: A\n\t\tCase Study", "date": "1995-11", "abstract": "Virtual reality (VR) applications raise enormous interest\ninside and outside computer science. Unfortunately, VR\nsystems are rather complex, involving many software and\nhardware modules being integrated. Theoretical papers are\nnot always of much aid in the actual implementation of VR\napplications. We try to fill this gap with a case study on\na simple example VR system, that is used to demonstrate\nthe most important aspects of a VR implementation, including\napplication design, implementation strategy, selection of\nhardware and software, rendering, tracking and display\ntechnology. Special attention is paid to practical issues\nthat are usually only learned by experience, and on the\ndiscussion of devices and methods that are inexpensive and\n\t\treadily available.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 230, 238 ], "number": "TR-186-2-95-12", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "virtual reality", "virtual environment", "immersion", "case study" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1995-CHI-paper.gz", "type": "application/octet-stream", "size": 94115, "path": "Publication:Schmalstieg-1995-CHI", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-CHI/Schmalstieg-1995-CHI-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-CHI/", "__class": "Publication" }, { "id": "Kopp-1995-LWB", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Lossless Wavelet Based Image Compression with Adaptive 2D\n Decomposition", "date": "1995-11", "abstract": "2D wavelets are usually generated from 1D wavelets through\nthe rectangular or through the square decomposition scheme.\nIn this paper a new adaptive 2D decomposition scheme for\ncompression related applications is presented. The adaptive\n2D decomposition selects 2D wavelet functions based on the\ncompression of the coefficients, but needs only the same\nnumber of 1D filter operations as the rectangular\ndecomposition for the compression and even less for the\ndecompression. Results for lossless image compression have\nshown improvements in the compression rate between 1% and 10%\ncompared to the square decomposition. Only in the case of\nvery small images (below 50x50) the adaptive decomposition\nwas outperformed by the square decomposition because of the\noverhead to store the selection, which 2D wavelets should\n be used.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 413 ], "number": "TR-186-2-95-11", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "image compression", "wavelets", "adaptive 2D wavelet decomposition" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Kopp-1995-LWB-paper.pdf", "type": "application/pdf", "size": 86974, "path": "Publication:Kopp-1995-LWB", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Kopp-1995-LWB/Kopp-1995-LWB-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Kopp-1995-LWB/", "__class": "Publication" }, { "id": "Groeller-1995-SDC", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Simulation und Darstellung computergenerierter Strickware", "date": "1995-11", "abstract": "In Computer Graphics a boundary representation of objects\nis often used to generate realistic synthetic images. For\ncertain objects it is more suitable to use a volume\nrepresentation. In this paper we investigate the\nvisualization of knitting patterns where the details\nof the yarn were modeled by voxel data. The visualization\nand the modeling of textiles has already been investigated\nin depth in the computer graphics literature. However most\nof the publications consider woven fabrics. In the case of\nknitwear the topological specification of the knitting\npattern allows a subdivision into basic elements. The thread\ncourse and the microstructure of the yarn are then\napproximated by voxel data. The periodic structure of\nknitting patterns allows for a compact representation and\nan efficient rendering. The generated images demonstrate the\n\t\tpossible realistic simulations. ", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166, 433, 434 ], "number": "TR-186-2-95-15", "pages_from": "1", "pages_to": "9", "research_areas": [ "Modeling" ], "keywords": [ "knitwear", "volume visualization", "textile modeling" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Groeller-1995-SDC-paper.gz", "type": "application/octet-stream", "size": 952940, "path": "Publication:Groeller-1995-SDC", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-SDC/Groeller-1995-SDC-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-SDC/", "__class": "Publication" }, { "id": "Schmalstieg-1995-IGC", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Implementing Gibsonian Virtual Environments", "date": "1995-10", "abstract": "We speculate on the possibilities for a realization of the\nidea of a three-dimensional Cyberspace, as sketched in\nthe novels of William Gibson using today's technology.\nVirtual reality and global networks such as the Internet\ntogether can provide the fundamentals for such an effort.\nFrom an examination of the technological principles of a\nGibsonian virtual environment, we conclude what properties\nsuch an implementation must have. An implementation of a\nsystem with these properties faces a number of problems in\nthe large and in the small; especially, the semantics of\nthe virtual environment and its inhabitants must be defined.\nWe also report on our ongoing implementation of a prototype\nsoftware system which was designed to evaluate the\n\t\tfeasibility of these ideas.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 249 ], "number": "TR-186-2-95-10", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "virtual environments", "Cyberspace" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1995-IGC-paper.gz", "type": "application/octet-stream", "size": 19142, "path": "Publication:Schmalstieg-1995-IGC", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-IGC/Schmalstieg-1995-IGC-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-IGC/", "__class": "Publication" }, { "id": "jankovic-1995-heter", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Heterogenous Morphing of Multimodal Medical Information", "date": "1995-09", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 444, 482, 166 ], "booktitle": "Proceedings of the 6th International Conference on Computer Analysis of Images and Patterns", "date_from": "1995-09-06", "date_to": "1995-09-08", "editor": "Hlavac, Vaclav; Sara, Radim", "isbn": "3-540-60268-2", "location": "Prague, Czech Republic", "publisher": "Springer", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/jankovic-1995-heter/", "__class": "Publication" }, { "id": "gervautz-1995-comp", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Computer Animation and Visualization - Current Status and Trends", "date": "1995-09", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 249, 202 ], "booktitle": "Proceedings of EUROSIM", "location": "Vienna, Austria", "note": "TALK: M. Gervautz", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/gervautz-1995-comp/", "__class": "Publication" }, { "id": "zeiller-1995-effi", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Efficient Collision Detection for General CSG Objects", "date": "1995-08", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 244, 190, 249 ], "booktitle": "Computer Animation' 95", "editor": "D. Thalmann, D. Terzopoulos", "location": "Wien, Austria", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/zeiller-1995-effi/", "__class": "Publication" }, { "id": "neumann-1995-anew", "type_id": "inbook", "tu_id": null, "repositum_id": null, "title": "A New Stochastic Radiosity Method for Highly Complex Scenes", "date": "1995-08", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 245, 413, 190 ], "booktitle": "In Photorealistic Rendering Techniques", "editor": "G. Sakas, P. Shirley, S. Müller", "isbn": "3540584757", "pages_from": "201", "pages_to": "213", "publisher": "Springer", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/neumann-1995-anew/", "__class": "Publication" }, { "id": "mazuryk-1995-two", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Two-Step Prediction and Image Deflection for Exact Head-Tracking in Virtual Environments", "date": "1995-08", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 238, 249 ], "booktitle": "Proceedings of Eurographics", "date_from": "1995-08-28", "date_to": "1995-08-29", "location": "Maastricht, Holland", "note": "TALK: T. Mazuryk 30.8.1995", "pages_from": "29", "pages_to": "41", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/mazuryk-1995-two/", "__class": "Publication" }, { "id": "neumann-1995-cons", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "The Constant Radiosity Step", "date": "1995-07", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 216, 439 ], "booktitle": "Rendering Techniques", "editor": "P. Hanrahan, W. Purgathofer", "location": "Wien, Austria", "note": "TALK: R. Tobler 13.5.1995", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/neumann-1995-cons/", "__class": "Publication" }, { "id": "Mazuryk-1995-ZRA", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Zoom Rendering: Accelerating 3-D Rendering Performance\n With 2-D Operations", "date": "1995-07", "abstract": "We propose a new method to accelerate rendering during the\ninteractive visualization of complex scenes. The method is\napplicable if the cost of per-pixel processing is high\ncompared to simple frame buffer transfer operations, as\nsupported by low-end graphics systems with high-performance\nCPUs or 2-D graphics accelerators. In this case rendering\nan appropriately down-scaled image and then enlarging it\nallows a trade-off of rendering speed and image quality.\nUsing this method, more uniform frame rates can be achieved,\n\t\tand the dynamic viewing error can be reduced.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 238, 202, 249 ], "number": "TR-186-2-95-09", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "zoom rendering", "2-D accelerators", "BitBlt", "Level of Detail", "rendering pipeline" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Mazuryk-1995-ZRA-paper.gz", "type": "application/octet-stream", "size": 62333, "path": "Publication:Mazuryk-1995-ZRA", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Mazuryk-1995-ZRA/Mazuryk-1995-ZRA-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Mazuryk-1995-ZRA/", "__class": "Publication" }, { "id": "Schmalstieg-1995-TVE", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Towards a virtual environment for interactive world building", "date": "1995-06", "abstract": "We propose an architecture for virtual environments that\nis aimed at the construction of a continuous global\ninformation space. Persistent simulation engines with freely\nprogrammable content are the key to achieve this goal. Our\napproach is based on a hybrid client-server/peer-to-peer\nnetwork: simulation data is maintained on a server that is\nresponsible for a region of the virtual environment. The\nserver exchanges information with neighboring servers, and\nallows users to participate in the environment through\nclients. The database is composed of object-oriented\nautonomous actors that communicate with each other by message\n\t\tpassing.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 249 ], "number": "TR-186-2-95-08", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "distributed virtual environments", "simulation", "client-server systems" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1995-TVE-paper.gz", "type": "application/octet-stream", "size": 29866, "path": "Publication:Schmalstieg-1995-TVE", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-TVE/Schmalstieg-1995-TVE-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Schmalstieg-1995-TVE/", "__class": "Publication" }, { "id": "traxler-1995-clac", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Calculation of tight bounding volumes for cyclic CSG-graphs", "date": "1995-05", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 237, 249 ], "booktitle": "Proceedings of 11th Spring Conference on Computer Graphics", "date_from": "1995-05-29", "date_to": "1995-06-03", "location": "Bratislava, Slovakia", "note": "TALK: C. Traxler", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/traxler-1995-clac/", "__class": "Publication" }, { "id": "elias-1995-view", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "View Dependent Solution for Monte Carlo Progressive Refinement Radiosity", "date": "1995-05", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 439, 232, 190 ], "booktitle": "Proceedings of 11th Spring Conference on Computer Graphics", "date_from": "1995-05-29", "date_to": "1995-06-03", "location": "Bratislava, Slovakia", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/elias-1995-view/", "__class": "Publication" }, { "id": "schmalstieg-1995-system", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "On System Architectures for Virtual Environments", "date": "1995-05", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 249 ], "booktitle": "Proceedings of the 11th Spring Conference on Computer Graphics", "date_from": "1995-05-29", "date_to": "1995-06-03", "location": "Bratislava, Slovakia", "note": "TALK: D. Schmalstieg 30.5.1995", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/schmalstieg-1995-system/", "__class": "Publication" }, { "id": "purgathofer-1995-gen", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Generating Semi-Stochastic Threshold Matrices for Ordered Dithering", "date": "1995-05", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 190, 216, 441 ], "booktitle": "Proceedings of 11th Spring Conference on Computer Graphics", "date_from": "1995-05-29", "date_to": "1995-06-03", "location": "Bratislava, Slovakia", "note": "TALK: W. Purgathofer 30.5.1995", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/purgathofer-1995-gen/", "__class": "Publication" }, { "id": "feda-1995-red", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Reducing Shadow Leaks without Explicit Meshing", "date": "1995-05", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 245, 481 ], "booktitle": "Proceedings of the 11th Spring Conference on Computer Graphics", "date_from": "1995-05-29", "date_to": "1995-06-03", "location": "Bratislava, Slovakia", "note": "TALK: M. Feda 30.5.1995", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/feda-1995-red/", "__class": "Publication" }, { "id": "feda-1995-visual", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Improving the Visual Quality of Intermediate Radiosity Images", "date": "1995-05", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 245 ], "booktitle": "Proceedings of the 11th Spring Conference on Computer Graphics", "date_from": "1995-05-29", "date_to": "1995-06-03", "location": "Bratislava, Slovakia", "note": "TALK: 30.5.1995", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/feda-1995-visual/", "__class": "Publication" }, { "id": "Acquisto-1995-DCR", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "A Distortion Camera for Ray Tracing", "date": "1995-03", "abstract": "Ray tracing is a powerful technique for realistic image\ngeneration. Typically a simple camera definition is used,\nwhereby a 3D environment is mapped onto an image plane\neither by an orthographic or perspective projection. The\nconcept of the usual simple camera definition is extended\nin several ways to achieve distorted views or projections\nof the object scene. The origins of primary rays are not\nrequired to lie on a plane anymore. Thus projections onto\ncurved image surfaces are possible. The directions of\nprimary rays may be chosen according to various nonlinear\nfunctions that allow nonstandard projections of the\nenvironment. The concept of centers of interest (coins) is\nintroduced that enables to concentrate on especially\ninteresting portions of object space. A center of interest\nis a 3D position that either distorts (attracts) a portion\nof the image surface or locally influences the directions\nof primary rays. The results of a test implementation are\npresented to show the feasibility of the methods presented.\nSeveral applications of distorted images are: creating\nelemental holographic images and raster omnimax images,\n\t\tvirtual reality and arts.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 438, 166 ], "number": "TR-186-2-95-05", "pages_from": "", "pages_to": "", "research_areas": [], "keywords": [ "ray tracing", "distortion camera", "projection", "image generation" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Acquisto-1995-DCR-paper.gz", "type": "application/octet-stream", "size": 128941, "path": "Publication:Acquisto-1995-DCR", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Acquisto-1995-DCR/Acquisto-1995-DCR-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Acquisto-1995-DCR/", "__class": "Publication" }, { "id": "Loeffelmann-1995-RTE", "type_id": "techreport", "tu_id": null, "repositum_id": null, "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.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 166 ], "number": "TR-186-2-95-06", "pages_from": "1", "pages_to": "18", "research_areas": [], "keywords": [ "Ray Tracing", "Camera Model", "Projections", "Image Distortions" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Loeffelmann-1995-RTE-paper.gz", "type": "application/octet-stream", "size": 656250, "path": "Publication:Loeffelmann-1995-RTE", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Loeffelmann-1995-RTE/Loeffelmann-1995-RTE-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Loeffelmann-1995-RTE/", "__class": "Publication" }, { "id": "Groeller-1995-CCG", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Coherence in Computer Graphics", "date": "1995-03", "abstract": "Coherence denotes similarities between items or entities.\nIt describes the extent to which these items or entities\nare locally constant. An introduction to coherence and a\nsurvey of various types of coherence, that are used in\ncomputer graphics, are given. Techniques and data\nstructures for exploiting coherence in computer graphics\nare described. Incremental techniques, bounding volume\nschemes, subdivision techniques and several geometric data\nstructures are discussed in more detail. Applications of\ncoherence principles to computer graphics are treated and\n\t\ta survey of previous research is done.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166, 190 ], "number": "TR-186-2-95-04", "pages_from": "1", "pages_to": "19", "research_areas": [], "keywords": [ "coherence", "computer graphics", "incremental techniques", "bounding volumes", "subdivision" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Groeller-1995-CCG-paper.gz", "type": "application/octet-stream", "size": 25837, "path": "Publication:Groeller-1995-CCG", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-CCG/Groeller-1995-CCG-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-CCG/", "__class": "Publication" }, { "id": "kopp-1995-eff", "type_id": "journalpaper_notalk", "tu_id": null, "repositum_id": null, "title": "Efficient filter computation with symmetric matrix kernels", "date": "1995-02", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 413 ], "journal": "Proceedings of Winter School on Compuer Graphics (WSCG)", "pages_from": "153", "pages_to": "161", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/kopp-1995-eff/", "__class": "Publication" }, { "id": "loeffelmann-1995-para", "type_id": "journalpaper", "tu_id": null, "repositum_id": null, "title": "Parametrizing Superquadrics", "date": "1995-02", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 166 ], "journal": "Proceedings of WSCG", "lecturer": [ 399 ], "location": "University of West Bohemia, Plzen, Czech Republic", "note": "TALK: H. Löffelmann 14.2.1995", "pages_from": "162", "pages_to": "172", "research_areas": [ "Geometry" ], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/loeffelmann-1995-para/", "__class": "Publication" }, { "id": "feda-1995-spee", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Speeding Up Progressive Radiosity by Overshooting", "date": "1995-02", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 245 ], "booktitle": "Proceedings of the Winter School of Computer Graphics and Visualization (WSCG)", "date_from": "1995-02-14", "date_to": "1995-02-18", "location": "Plzen, Czech Republic", "note": "TALK: R. Tober", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/feda-1995-spee/", "__class": "Publication" }, { "id": "groeller-1995-attract", "type_id": "journalpaper_notalk", "tu_id": null, "repositum_id": null, "title": "Attract - Interactive Visualization of Dynamical Systems", "date": "1995-02", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166, 442 ], "journal": "Proceedings of WSCG'95", "pages_from": "93", "pages_to": "102", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-attract/", "__class": "Publication" }, { "id": "tobler-1995-vega", "type_id": "journalpaper", "tu_id": null, "repositum_id": null, "title": "VEGA: Vienna Environment for Graphics Applications", "date": "1995-02", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 216, 399, 190 ], "journal": "Proceedings of Winter School on Compuer Graphics (WSCG)", "location": "University of West Bohemia, Plzen, Czech Republic", "note": "TALK: R. Tober", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/tobler-1995-vega/", "__class": "Publication" }, { "id": "groeller-1995-inter", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Interactive Exploration of Dynamical Systems", "date": "1995-02", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166 ], "booktitle": "Proceedings of Visual Data Exploration and Analysis II, In IS&T/SPIE Proceedings", "location": "San Jose, USA, Convention Center", "note": "TALK: 8.2.1995", "pages_from": "132", "pages_to": "138", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-inter/", "__class": "Publication" }, { "id": "Fischel-1995-VLS", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Visualization of Local Stability of Dynamical Systems", "date": "1995-01", "abstract": "Several methods for visualizing local stability\nproperties of dynamical systems are presented. The\ncalculation of characteristic values of local stability\nfor linear and nonlinear systems is discussed. Two\nprinciples of visualizing local stability are introduced.\nThe first principle is to display the estimated stability\nvalues directly by using scaled spheres or vectors. The\nsecond principle uses numerical analysis which generates\nportions of sweeps, that are deformed in dependence of local\n\t\t stability properties.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 416, 166 ], "number": "TR-186-2-95-2", "pages_from": "1", "pages_to": "11", "research_areas": [], "keywords": [ "" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Fischel-1995-VLS-paper.gz", "type": "application/octet-stream", "size": 1753300, "path": "Publication:Fischel-1995-VLS", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Fischel-1995-VLS/Fischel-1995-VLS-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Fischel-1995-VLS/", "__class": "Publication" }, { "id": "Neumann-1995-SRM", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "The Stochastic Ray Method for Radiosity", "date": "1995-01", "abstract": "This paper solves the system of radiosity\nequations with a numerical approach rather than\nwith a physical interpretation as most current\nalgorithms do. Due to the high complexity of the\nproblem for highly complex scenes, a stochastic\nvariation of Jacobi iteration is developed which\nconverges stochastically to the correct solution.\nThe new method, called Stochastic Ray Method, is a\nsignificant improvement of Stochastic Radiosity. A\nlarge number of independent rays is chosen\nstochastically by importance sampling of the\npatches according to their power after the previous\niteration step. They all carry an equal amount of\npower into random directions, thereby representing\ntogether the total energy interreflection of the\nentire environment in a stochastic manner.\nAssuming a correctly distributed initial solution,\nwhich can be reached easily, the iteration\nprocess converges quickly and reduces the error\nin the result faster than other stochastic\nradiosity approaches. The new algorithm can\neasily be extended to treat various phenomena which\nare normally rather costly to incorporate in\nradiosity environments: specular reflection and\nspecular transmittance, non-diffuse emission and\n point light sources.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 190, 216, 232, 439, 245, 440 ], "number": "TR-186-2-95-3", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "rendering", "radiosity", "stochastic", "raytracing" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neumann-1995-SRM-paper.gz", "type": "application/octet-stream", "size": 55968, "path": "Publication:Neumann-1995-SRM", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Neumann-1995-SRM/Neumann-1995-SRM-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Neumann-1995-SRM/", "__class": "Publication" }, { "id": "Groeller-1995-IED", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Interactive Exploration of Dynamical Systems", "date": "1995-01", "abstract": "Nonlinear deterministic dynamical systems often exhibit\ncomplex and chaotic behavior which is difficult to\ncomprehend. Visualizing the characteristics of such systems\nis therefore essential for an understanding of the underlying\ndynamics. In this paper concepts for the interactive\ngraphical exploration of analytically defined dynamical\nsystems are discussed. Emphasis is put on interactivity which\nshall facilitate the investigation and exploration of such\nsystems. The following topics on dynamical systems are\ntreated in more detail: interactive specification, simple and\nfast graphical representation, and interactive modification.\nThe paper concentrates on 2D and 3D orthographic projections\nof higher-dimensional phase spaces and on the display of\nbifurcation diagrams. A prototype software system which\nincorporates the previously presented ideas is shortly\ndiscussed. The software system is intended to offer a quick\ninsight into the dynamics of a dynamical system and to enable\n\t\tfast investigation of variations of a dynamical system.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166 ], "number": "TR-186-2-95-1", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "dynamical system", "interactive analysis", "phase space", "bifurcation", "chaos theory" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Groeller-1995-IED-paper.gz", "type": "application/octet-stream", "size": 127462, "path": "Publication:Groeller-1995-IED", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-IED/Groeller-1995-IED-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-IED/", "__class": "Publication" }, { "id": "gervautz-1995-repre", "type_id": "journalpaper_notalk", "tu_id": null, "repositum_id": null, "title": "Representation and Realistic Rendering of Natural Phenomena with Cyclic CSG-Graphs", "date": "1995", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 249, 237 ], "issn": "01782789", "journal": "Visual Computer", "volume": "11", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/gervautz-1995-repre/", "__class": "Publication" }, { "id": "purgathofer-1995-imp", "type_id": "inbook", "tu_id": null, "repositum_id": null, "title": "Improved Matrices for Ordered Dithering", "date": "1995", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 190, 216, 441 ], "booktitle": "Graphics Gems V", "editor": "Alan Paeth", "publisher": "Academic Press", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/purgathofer-1995-imp/", "__class": "Publication" }, { "id": "groeller-1995-dyn", "type_id": "talk", "tu_id": null, "repositum_id": null, "title": "Visualisierung dynamischer Systeme unter Berücksichtigung lokaler Eigenschaften", "date": "1995", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 166 ], "date_to": "1995-03-24", "event": "Konversatorium aus Operatins Research", "location": "TU Wien, Austria", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": 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