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C 2 Gregory patch
(Eurographics Association, 1991)
G² continuity of free-form surfaces is sometimes very important in engineering applications. The conditions for G2 continuity between two Bezier patches has been studied and methods developed to ensure such continuity. ...
Computational Physics : A Modeler - Simulator for animated physical Objects
(Eurographics Association, 1991)
Physical modeling for animation is now firmly established. The present aim is to design and build a structured and well-defined tool rather than merely specific algorithms to simulate physical knowledge. We will first ...
Fast Rendering of General Ellipses
(Eurographics Association, 1991)
Even though GKS did not include circles and, in a more general form, ellipses and elliptical arcs in the list of elementary graphics primitives, CGM settled this omission with its standardization in 1987. According to CGM ...
Using temporal and spatial coherence for accelerating the calculation of animation sequences
(Eurographics Association, 1991)
Ray tracing is a well known technique for generating realistic images. One of the major drawbacks of this approach are the extensive computational requirements for image calculation. When generating animation sequences ...
Validity Issues for Modular Boundary Models
(Eurographics Association, 1991)
Modular boundary models are a class of solid models which describe a solid object as a collection of face-abutting object parts, called components. The Face-to-Face Composition (FFC) model is a specific model of this class, ...
Tessellation of Curved Surfaces under Highly Varying Transformations
(Eurographics Association, 1991)
We pursue the problem of step size determination for tessellating arbitrary degree polynomial and rational Bezier patches, under highly varying modeling and viewing transformations, to within post-viewing size and/or ...
Timewarps: A Temporal Reparameterization Paradigm for Parametric Animation
(Eurographics Association, 1991)
The ability to reparameterize the temporal axis in an animated sequence is a powerful and underexplored tool. Timewarps are described as extensions to previous work and the advantages of this tool are outlined. Timewarps ...
Constructive Page Description Opening Up the Prepress World
(Eurographics Association, 1991)
Constructive Page Description (CPD) is an overall approach allowing different kinds of data to be exchanged between a variety of systems and manipulated in arbitrary system environments. Fully changeable pages, which keep ...
Solid-Interpolating Deformations: Construction and animation of PIPs
(Eurographics Association, 1991)
Computer programs that simulate the deformations of geometric shapes have played a key role in the increasing popularity of software tools for artistic animation. Previously published techniques for specifying and animating ...
Low Sampling Densities using a psychovisual approach
(Eurographics Association, 1991)
It has long been observed that the keenness of sight is lower for diagonal directions than for horizontal or vertical ones. This anisotropy of the human eye response can be exploited by using a non-orthogonal sampling ...