Journal ArticleDOI
Designing surfaces in 3-D
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TLDR
An experimental system for computer-aided design of free-form surfaces in three dimensions that allows 3-D movements of the points controlling the shapes of the surfaces and the mathematical formulations used assume no knowledge of them by the user of the system.Abstract:
An experimental system for computer-aided design of free-form surfaces in three dimensions is described. The surfaces are represented in the system as parametric basis splines. The principal features of the system are: (1) the surfaces are rendered as isoparametric line drawings on a head-mounted display, and they are designed with the aid of a three-dimensional “wand,” which allows 3-D movements of the points controlling the shapes of the surfaces, (2) all of the interactions with the surfaces are in real-time, and (3) the mathematical formulations used assume no knowledge of them by the user of the system. Also examined are some of the features that should be part of a practical 3-D system for designing space-forms.read more
Citations
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Journal ArticleDOI
Hierarchical geometric models for visible surface algorithms
TL;DR: The geometric structure suggests a recursive descent, visible surface algorithm in which the computation time potentially grows linearly with the visible complexity of the scene, and the range of complexity of an environment is greatly increased.
Patent
Magical wand and interactive play experience
TL;DR: In this article, a toy 'wand' (100) and other actuation/tracking device (321, 325) are used to interact with the surrounding play environment to achieve desired goals or produce desired effects.
Proceedings ArticleDOI
Pen-based haptic virtual environment
TL;DR: A six degree-of-freedom force reflective master manipulator which has a pen-shaped grip has been developed and is exemplified in interactive deformation of a free-form surface.
Journal ArticleDOI
3-Draw: a tool for designing 3D shapes
TL;DR: A fundamentally new type of CAD system for designing shape that is intuitive, easy to use, and powerful is presented, based on a paradigm that can be described as designing directly in 3-D.
References
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Proceedings ArticleDOI
A head-mounted three dimensional display
TL;DR: The fundamental idea behind the three-dimensional display is to present the user with a perspective image which changes as he moves, and this display depends heavily on this "kinetic depth effect".
A subdivision algorithm for computer display of curved surfaces.
TL;DR: A method for producing computer shaded pictures of curved surfaces using three-dimensional curved patches, which can be 'mapped' onto patches thus providing a means for putting texture on computer-generated pictures.
ReportDOI
Surfaces for computer-aided design of space forms
TL;DR: A method is described which makes possible the description of free-form doubly curved surfaces of a very general kind, specifically devised for use in the Computer-Aided Design Project at M.I.T.