We first outline an overall design philosophy for rigid geometric manipulations, then examine a manipulation's characteristics: nesting, scope, pivot constraints, and axis, constraints. We show how a mnemonic notation helps us explain how a simple ...

A system for interactively describing and modifying free-form surfaces is presented. The system is based on the use of bicubic patches. Although it is not a full-fledged mechanical CAD system, it has been used to construct complex surface descriptions. ...

One of the biggest obstacles to the wider adoption of geometric modelling systems for three-dimensional objects is the relatively poor state of user interfaces. In geometric design, two forms of interface are required: one which permits rapid evaluation ...

One important message of this paper is that vision research is highly relevant to 3D graphics technology and that modern electronic graphical systems can and soon will strongly stimulate the further development of vision science. First an outline is ...

Let scene composition be the precise placement of shapes relative to each other, using affine transformations. By this definition, the steps of scene composition are the selection of objects to be moved, the choice of transformation, and the ...

A six degree-of-freedom input device presents some novel possibilities for manipulating and positioning three-dimensional objects. Some experiments in using such a device in conjunction with a real-time display are described. A particular problem which ...

We present a visually interactive approach to the design of 3-D computer-animated legged animal motion in the context of the PODA computer animation system. The design process entails the interactive specification of parameters which drive a ...

We developed a system for automatically building three-dimensional geometric objects that are defined by their topology and by geometric constraints. A solid modeller is used for sketching the object. The geometric constraints are first evaluated ...

The success of solid modelling in industrial design depends on facilities for specifying and editing parameterized models of solids through user-friendly interaction with a graphical front-end. Systems based on a dual representation, which combines ...

Interactive tools have long been important fundamental components of computer animation systems. Interactive tools in the form of electronic paint systems, cel painting systems, and in-betweening systems are major components of two-dimensional character ...

A head-mounted, wide-angle, stereoscopic display system controlled by operator position, voice and gesture has been developed for use as a multipurpose interface environment. The system provides a multisensory, interactive display environment in which a ...

An assortment of algorithms, termed three-dimensional (3D) scan-conversion algorithms, is presented. These algorithms scan-convert 3D geometric objects into their discrete voxel-map representation within a Cubic Frame Buffer (CFB). The geometric objects ...

Clark advocated quasi-general-purpose arrays of computers as the most cost-effective means to high-performance graphics and other applications as well. Such arrays can be quite inexpensive, offering orders of magnitude improvement over the cost of ...

We have undertaken to provide radiotherapists with Computer-Aided Design and 3D display tools to advance radiation treatment planning. A major part of this effort is a CAD tool for radiation treatment design that allows physicians to comfortably explore ...

The Man-computer Interactive Data Access System (McIDAS) developed at the University of Wisconsin-Madison Space Science and Engineering Center (UW-SSEC) collects large quantities of meteorological data in real time for storage, analysis and display on ...

As part of our graphics research into virtual worlds, we are building a tool for an architect and his client to use for rapid prototyping of buildings by visually “walking through” them in order to refine specifications.

Our first prototype simulated the ...

Alan Kay asked us to remember the words of Bob Barton, “good ideas don't often scale”, with respect to using the same window paradigm for everything from Macintoshes to ultra-high resolution large screens. He further suggested that good user interfaces ...