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  • Articles  (6)
  • Ray tracing  (6)
  • Springer  (6)
  • Blackwell Publishers Ltd
  • Blackwell Publishing Ltd
  • Emerald
  • International Union of Crystallography
  • 1995-1999
  • 1985-1989  (6)
  • 1975-1979
  • 1965-1969
  • 1988  (6)
  • Computer Science  (6)
  • Economics
  • Geography
  • Natural Sciences in General
  • Energy, Environment Protection, Nuclear Power Engineering
Collection
  • Articles  (6)
Source
Keywords
Publisher
  • Springer  (6)
  • Blackwell Publishers Ltd
  • Blackwell Publishing Ltd
  • Emerald
  • International Union of Crystallography
Years
  • 1995-1999
  • 1985-1989  (6)
  • 1975-1979
  • 1965-1969
Year
Topic
  • Computer Science  (6)
  • Economics
  • Geography
  • Natural Sciences in General
  • Energy, Environment Protection, Nuclear Power Engineering
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of an algorithm for fast ray tracing using uniform space subdivision (1988)
    Springer
    The visual computer 4 (1988), S. 65-83 
    Details
    ISSN: 1432-2315
    Keywords: Ray tracing ; Space subdivision ; Rendering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Ray tracing is becoming popular as the best method of rendering high quality images from three dimensional models. Unfortunately, the computational cost is high. Recently, a number of authors have reported on ways to speed up this process by means of space subdivision which is used to minimize the number of intersection calculations. We describe such an algorithm together with an analysis of the factors which affect its performance. The critical operation of skipping an empty space subdivision can be done very quickly, using only integer addition and comparison. A theoretical analysis of the algorithm is developed. It shows how the space and time requirements vary with the number of objects in the scene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01905559
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    VISYR: a simulation tool for mobile robots using vision sensors (1988)
    Springer
    The visual computer 3 (1988), S. 298-303 
    Details
    ISSN: 1432-2315
    Keywords: Robotics ; Vision sensors ; Ray tracing ; Dynamic management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract With the advent of mobile robots and inboard vision sensors mounted directly on the robot's wrist, new kinds of problems lie in the image processing field as, for example, dynamic scene analysis or motion estimation. The lack of flexibility of real experiments led us to implement at IRISA a general simulation tool devoted to the study of robots using moving vision sensors. VISYR allows us to simulate the image perceived by a robot of its environment during its motion. The first part of the paper is devoted to the modelling of the 3D scene containing complex objects and to the design of a suitable robotics vision sensor. In the second part, a new algorithm of dynamic management of the local data basis perceived by the sensor is presented. The parameters of the vision sensors are highly adjustable and VISYR is conceived to allow the fast development of algorithms using dynamic vision data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914865
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Load balancing strategies for a parallel ray-tracing system based on constant subdivision (1988)
    Springer
    The visual computer 4 (1988), S. 197-209 
    Details
    ISSN: 1432-2315
    Keywords: Multiprocessor system ; Load balancing ; Performance evaluation ; Ray tracing ; Parallel algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Static and dynamic load balancing strategies for a multiprocessor system for a ray tracing algorithm based on constant subdivision are presented. An object space is divided into regular cubes (subspaces), whose boundary planes are perpendicular to the coordinate axes, and these are allocated to the processors in the system. Here, load balancing among the processors is the most important problem. Firstly, in a category of static load balancing, strategies for mapping the subspaces into the processors are evaluated by simulation. Moreover, we propose a hierarchical multiprocessor system in order to realize dynamic load balancing with the static one. Its architecture can overcome the limitation of the static load balancing in a large scale multiprocessor system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01887592
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  • 4
    Electronic Resource
    Electronic Resource
    GemstoneFire: adaptive dispersive ray tracing of polyhedrons (1988)
    Springer
    The visual computer 4 (1988), S. 259-270 
    Details
    ISSN: 1432-2315
    Keywords: Dispersion phenomenon ; Local attenuation coefficient ; Ray tracing ; Adaptive sampling ; Spreading ray model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Synthesizing realistic images of gemstones requires techniques beyond the scope of normal ray tracing. The ‘fire’ of such highly refractive objects is what makes gemstones attractive, and also imposes very high computational overhead to perform time consuming dispersive ray tracing. Gemstones are usually cut in polyhdrons as for example, a brillant cut. After a detailed analysis of the nature of dispersive ray tracing of polyhedral objects, we propose here a new method of using three simple rays adaptively to model the ray spreading caused by dispersive refraction. It is shown that the proposed method reduces the computational complexity to an order close to that of normal ray tracing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01901281
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  • 5
    Electronic Resource
    Electronic Resource
    Two algorithms for taking advantage of temporal coherence in ray tracing (1988)
    Springer
    The visual computer 4 (1988), S. 123-132 
    Details
    ISSN: 1432-2315
    Keywords: Ray tracing ; Ray casting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The basic ray-tracing algorithm is adapted to make ray-tracing faster for the production of motion pictures. Two algorithms are presented. The image space temporal coherence algorithm takes advantage of the fact that motion picture images do not change very much from frame to frame. The reprojection algorithm uses information about the object space saved from the previous frame to accelerate the processing of the current frame. The reprojection algorithm is used when the viewpoint of the current frame is changed by a small amount from the viewpoint of the previous frame.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01908895
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  • 6
    Electronic Resource
    Electronic Resource
    Multiprocessing for ray tracing: a hierarchical self-balancing approach (1988)
    Springer
    The visual computer 4 (1988), S. 188-196 
    Details
    ISSN: 1432-2315
    Keywords: Computer graphics ; Ray tracing ; Parallel algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A novel parallel processing algorithm for image synthesis using ray tracing is presented. The scene is first organized in a hierarchical data structure which is then cut at some level. The object descriptions along with their bounding volumes are distributed accordingly among the processors of an MIMD system. There are two independent processes in, each processor: one is demand driven and used for bounding volumes calculations while the second is data driven and used for intersection calculations. This scheme, where the first process can be executed by any, processor, suggested an algorithm with an embedded load balancing mechanism. It has almost a linear speedup and its storage requirements are small. Simulation results are presented to illustrate these features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01887591
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    Paper (German National Licenses)
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