The proceedings contain 36 papers. The topics discussed include: configurable applications for graphics employing satellites (CAGES);computer animation of the sphere eversion;wave: interactive color graphics for wavef...
The proceedings contain 36 papers. The topics discussed include: configurable applications for graphics employing satellites (CAGES);computer animation of the sphere eversion;wave: interactive color graphics for waveform analysis;a graphics operating system;the development of a dynamic interactivecomputergraphics research and educational support environment;towards device-independent graphics systems;effective application of computergraphics;computer animation of free form images;computer animation at Lawrence Livermore laboratory;on high-level programming systems for structured display programming;a special-purpose computer system for on-line generation and display of "random-dot" stimuli for stereoscopic vision experiments;three-dimensional human display model;display of electrical wave forms from the heart;a terminal-oriented clinical record system;computer animation;and a computergraphics system for modular building elevation design.
This work presents a new general approach for applying textures onto implicit surfaces. Its main contributions are: An improved set of interactive tools for subdividing implicit surfaces into convenient patches. An ef...
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ISBN:
(纸本)9780897917018
This work presents a new general approach for applying textures onto implicit surfaces. Its main contributions are: An improved set of interactive tools for subdividing implicit surfaces into convenient patches. An efficient and reliable algorithm for deriving parameterizations for these patches. A new set of useful texturing operations. These results provide a unified representation scheme for a variety of texturing techniques that were previously incompatible, allowing more efficient manipulation, storage, and rendering of textured objects and a fuller use of current texture mapping hardware.
The theory of the multivariate polyhedral splines is applied to analytic antialiasing: a triangular simplex spline is used to represent surface intensity, while a box spline is used as a filter. Their continuous convo...
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ISBN:
(纸本)9780897917018
The theory of the multivariate polyhedral splines is applied to analytic antialiasing: a triangular simplex spline is used to represent surface intensity, while a box spline is used as a filter. Their continuous convolution is a prism spline that can be evaluated exactly via recurrence. Evaluation performance can be maximized by exploiting the properties of the prism spline and its relationship to the sampling grid. After sampling, digital signal processing can be used to evaluate exactly and efficiently the sampled result of any analytic spline filter in the span of the box spline basis used as the original analytic filter.
An expressive 3D animation environment that enables users to rapidly and visually prototype animated worlds with fully 3D user-interface is presented. In this environment, there is no intrinsic difference between user...
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An expressive 3D animation environment that enables users to rapidly and visually prototype animated worlds with fully 3D user-interface is presented. In this environment, there is no intrinsic difference between user-interface and application objects. An accompanying video is presented to illustrate the approach with interactive sequences showing the visual construction of 3D animated worlds. Generally, the demonstrations in the video are recorded live and were not edited.
An approach based on a mathematical formalization of desirable properties of pictures is presented for correcting several types of perceived geometric distortions in computer-generated and photographic images. Percept...
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ISBN:
(纸本)9780897917018
An approach based on a mathematical formalization of desirable properties of pictures is presented for correcting several types of perceived geometric distortions in computer-generated and photographic images. Perceptually preferable viewing transformations are obtained from a small set of simple assumptions and shown to be decomposed into a perspective or parallel projection followed by a planar transformation. Following this, it is proven that two perceptually important properties are incompatible and cannot be satisfied simultaneously. By implementing the proposed transformations to computer-generated and photographic perspective projection images, it is found that the transformations considerably reduced distortion in wide-angle motion pictures andcomputer-generated animations.
Artistic screening is a new image reproduction technique that incorporates freely created artistic screen elements for generating halftones. This approach is particularly suited for the reproduction of images on large...
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ISBN:
(纸本)9780897917018
Artistic screening is a new image reproduction technique that incorporates freely created artistic screen elements for generating halftones. This approach is particularly suited for the reproduction of images on large posters. With this technique, full size and microscopic letters can be incorporated into the image reproduction process. Counterfeiting can be avoided by using banknotes to compromise grayscale images with intensity levels produced by microletters of varying size and shape.
Cursor snapping is a standard method for providing precise pointing in direct manipulation graphical interfaces. In this paper, we introduce image snapping, a variant of cursor snapping that works in image-based progr...
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ISBN:
(纸本)9780897917018
Cursor snapping is a standard method for providing precise pointing in direct manipulation graphical interfaces. In this paper, we introduce image snapping, a variant of cursor snapping that works in image-based programs such as paint systems. Image snapping moves the cursor location to nearby features in the image, such as edges. It is implemented by using gradient descent on blurred versions of feature maps made from the images. Interaction techniques using cursor snapping for image segmentation and curve tracing are presented.
We have developed a system for interactive manipulation of shading parameters for three dimensional rendering. The system takes as input user-defined shaders, written in a subset of C, which are then specialized for i...
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ISBN:
(纸本)9780897917018
We have developed a system for interactive manipulation of shading parameters for three dimensional rendering. The system takes as input user-defined shaders, written in a subset of C, which are then specialized for interactive use. Since users typically experiment with different values of a single shader parameter while leaving the others constant, we can benefit by automatically generating a specialized shader that performs only those computations depending on the parameter being varied;all other values needed by the shader can be precomputed and cached. The specialized shaders are as much as 95 times faster than the original user defined shader. This dramatic improvement in speed makes it possible to interactively view parameter changes for relatively complex shading models, such as procedural solid texturing.
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