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An efficient method for volume rendering using perspective projection

An efficient method for volume rendering using perspective p...

引用

1990 Workshop on Volume Visualization, VVS 1990

作者： Novins, Kevin L. Sillion, Frangois X. Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14850 United States

ISBN: (纸本)0897914171

Use of the perspective projection adds important perceptual cues for image comprehension. However, it has not been widely used in volume rendering because of the lack of efficient computational algorithms and concern over the non uniform sampling rate imposed by perspective ray divergence. This paper introduces two new techniques to help make perspective projection more feasible in rendering volume data. First, a method is presented for efficient slice-by-slice processing of volume data, allowing high resolution data sets by eliminating typical memory constraints. Second, an adaptive "ray splitting" approach is described which ensures that the entire volume is sampled within user-specified limits. Additionally, we present results using distributed ray tracing to achieve depth of field effects. © 1990 ACM.

关键词： Ray tracing

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A comprehensive physical model for light reflection 91

A comprehensive physical model for light reflection

引用

18th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1991

作者： He, XiaoD . Torrance, Kenneth E. Sillion, Francois X. Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897914368

A new general reflectance model for computer graphics is presented . The model is based on physical optics and describes specular, directional diffuse, and uniform diffuse reflection by a surface. The reflected light pattern depends on wavelength , incidence angle, two surface roughness parameters, and surface refractive index. The formulation is self consistent in terms of polarization , surface roughness, masking/shadowing, and energy. The model applies to a wide range of materials and surface finishes and provides a smooth transition from diffuse-like to specular reflection as the wavelength and incidence angle are increased or the surface roughness is decreased. The model is analytic and suitable for computer graphics applications. Predicted reflectance distributions compare favorably with experiment. The model is applied to metallic, nonmetallic, and plastic materials , with smooth and rough surfaces. © 1991 ACM.

关键词： Surface roughness

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A generalized graphic preprocessor for two-dimensional finite element analysis 78

A generalized graphic preprocessor for two-dimensional finit...

引用

5th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1978

作者： Haber, Robert Shephard, Mark Abel, John Gallagher, Richard Greenberg, Donald Program of Computer Graphics Department of Structural Engineering Cornell University United States

ISBN: (纸本)9781450379083

Input preprocessors have come to be recognized as important components of modern finite element programs. A method is described which utilizes interactive computer graphics digitizing techniques to create a powerful input preprocessor for finite element analysis. A limited number of general mesh generators based on linear blending functions permit the program to handle virturally all two-dimensional topologies. The processes of geometric input and specification of problem-specific "attributes" have been kept separate so that the mesh generation routines may be used with a variety of analysis programs. Graphical editors have been implemented to specify attributes for structural mechanics problems. Although this type of graphical preprocessor shows considerable promise for applications in three dimensions, there are still unresolved problems in the areas of geometrical description, perception, and interactive hardware. © 1978 Association for Computing Machinery. All rights reserved.

关键词： Mesh generation

来源：评论

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Perceptual color spaces for computer graphics 80

Perceptual color spaces for computer graphics

引用

7th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1980

作者： Meyer, Gary W. Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897910214

Perceptually uniform color spaces can be a useful tool for solving computer graphics color selection problems. However, before they can be used effectively some basic principles of tristimulus colorimetry must be understood and the color reproduction device on which they are to be used must be properly adjusted. The Munsell Book of Color and the Optical Society of America (OSA) Uniform Color Scale are two uniform color spaces which provide a useful way of organizing the colors of a digitally controlled color television monitor. The perceptual uniformity of these color spaces can be used to select color scales to encode the variations of parameters such as temperature or stress. � ACM. All rights reserved.

关键词： Color

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computer simulation of foliage shading in building energy loads 16

Computer simulation of foliage shading in building energy lo...

引用

16th Design Automation Conference, DAC 1979

作者： Schiler, Marc Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

The calculation of building thermal loads using the computer has been an accepted practice for several years. A substantial amount of research and theoretical investigation has been expended in attempts to accurately quantify a building's thermal behavior. A number of existing simulation packages acceptably model this behavior. 1,2,3,4,5,*** advantages of simulation are obvious, not only for the predictive information with respect to operating costs or fuel consumption, but as a potential aid for preliminary design. The influence and tradeoffs of a large number of design variables such as siting, orientation, window area, thermal resistivity, surface/volume ratios, and cost can all be examined at an early stage in the design process. © 1979 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Operating costs

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Painting with light 93

Painting with light

引用

20th International Conference on computer graphics and Interactive Techniques, SIGGRAPH 1993

作者： Schoeneman, Chris Dorsey, Julie Smits, Brian Arvo, James Greenberg, Donald Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897916018

We present a new approach to lighting design for image synthesis. It is based on the inverse problem of determining light settings for an environment from a description of the desired solution. The method is useful for determining light intensities to achieve a desired effect in a computer simulation and can be used in conjunction with any rendering algorithm. Given a set of lights with fixed positions, we determine the light intensities and colors that most closely match the target image painted by the designer using a constrained least squares approach. We describe an interactive system that allows flexible input and display of the solution. © 1993 ACM.

关键词： Ray tracing

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Combining hierarchical radiosity and discontinuity meshing 93

Combining hierarchical radiosity and discontinuity meshing

引用

20th International Conference on computer graphics and Interactive Techniques, SIGGRAPH 1993

作者： Lischinski, Dani Tampieri, Filippo Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897916018

We introduce a new approach for the computation of view-independent solutions to the diffuse global illumination problem in polyhedral environments. The approach combines ideas from hierarchical radiosity and discontinuity meshing to yield solutions that are accurate both numerically and visually. First, we describe a modified hierarchical radiosity algorithm that uses a discontinuity-driven subdivision strategy to achieve better numerical accuracy and faster convergence. Second, we present a new algorithm based on discontinuity meshing that uses the hierarchical solution to reconstruct an object-space approximation to the radiance function that is visually accurate. Our results show significant improvements over both hierarchical radiosity and discontinuity meshing algorithms. © 1993 ACM.

关键词： Approximation algorithms

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A global illumination solution for general reflectance distributions 91

A global illumination solution for general reflectance distr...

引用

18th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1991

作者： Sillion, Francois X. Arvo, James R. Westin, Stephen H. Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897914368

A general light transfer simulation algorithm for environments composed of materials with arbitrary reflectance functions is presented. This algorithm removes the previous practical restriction to ideal specular and/or ideal diffuse environments, and supports complex physically based reflectance distributions. This is accomplished by extending previous two-pass ray-casting radiosity approaches to handle non-uniform intensity distributions, and resolving all possible energy transfers between sample points. An implementation is described based on a spherical harmonic decomposition for encoding both bidirectional reflectance distribution functions for materials, and directional intensity distributions for illuminated surfaces. © 1991 ACM.

关键词： Reflection

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Validation of global illumination simulations through CCD camera measurements

Validation of global illumination simulations through CCD ca...

引用

Final program and Proceedings of the 5th IS and T/SID Color Imaging Conference: Color Science, Systems and Applications

作者： Pattanaik, Sumanta N. Ferwerda, James A. Torrance, Kenneth E. Greenberg, Donald Program of Computer Graphics Cornell University Ithaca NY 14853 United States

A technique for calibrating a charge coupled devices (CCD) camera for direct colorimetric comparison between the captured images of the real environment and synthetic images of the simulated environments is presented. The comparison is used to validate lighting algorithms used for computing synthetic images. The calibration model relating the pixel signal to various physical factors is tested using the CCD camera and an integrating sphere uniform light source.

关键词： Lighting

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computer graphics visualization for acoustic simulation 89

Computer graphics visualization for acoustic simulation

引用

16th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1989

作者： Stettner, Adam Greenberg, Donald P. Program of Computer Graphics Cornell University IthacaNY14853 United States

ISBN: (纸本)0897913124

computer simulations can be used to generate the spatial and temporal data describing the acoustical behavior of performance halls, but typically the analytical results are difficult to assimilate and compare. By using computer graphics to display the multi-dimensional data, substantially greater amounts of information than that conveyed by standard techniques can be communicated to the designer. This allows designs of different acoustical spaces to be tested, evaluated, and compared. An example comparing the acoustical behavior of three different concert halls demonstrates these techniques and allows for the simultaneous assimilation of much of the information necessary to evaluate the acoustical nature of a space. The use of three-dimensional images, color, animation and abstract representation allows for the comprehension of the complex results of a scientific simulation. Specifically, the simultaneous display of particular icons familiar to the discipline enabled the simultaneous presentation of up to twelve parameters. From a more general point of view, the procedures demonstrate how computer graphics can be utilized for the portrayal of multi-dimensional time dependent data. The visualization techniques are potentially useful for the display of three-dimensional vector fields in many scientific and design applications.

关键词： Data visualization

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