were drawings; that is, the units of composition were This paper is an assessment of the status and use of lines and text.
computer-aided design systems in architectural practice
Application languages were added, allowing procedural in the United States. The orientation is not so much definition of common compositions. Initially, procedural towards an assessment of usage in numbers ot users as a review of the technology, its potential, its shortcomings capabilities were directed towards complex drawing primitives, such as dimensions and crosshatching. Later, and where it is likely to go. The trame ot reterence is they were used to deal with nongraphic information: twenty years: a review of ten years into the past and a for bills of material, rule checking and some forms of projection ot ten years into the future. On this anniversary automatic detailing. Reports and schedules could be of Computer-Aided Design, a view is offered of where extracted from the nongraphic data associated with a the field stood ten years ago, to give a perspective to what has been accomplished. An assessment is also drawing. These capabilities emerged incrementally, through given of where we are today and a scenario often years trial and error, in sequential product releases. CAD into the future is proposed. This projection is both a evolved pragmatically, without a strong theoretical prediction, with regard to the evolution of technology, underpinning. New features in one company's products and the definition of a set ot achievable goals for the next decade, were quickly emulated in the later releases of other companies' products. By the late 1970s, the basic structure of computer-aided drafting systems emerged computer-aided design, architecture, construction, modelling as we know them today. Ten years ago, architectural computer-aided design was dominated in the USA by Intergraph, which had The ideals and goals for CAD in architecture were set recently surpassed Autotrol as the CAD system company out in the mid-1960s. There were exciting prospects of with the largest sales in the architecture, engineering the computer serving as a design assistant, supporting and construction (AEC) market. They held about 40% and magnifying designers' abilities, checking assumptions, of the AEC market. Digital Equipment PDP-11s were and doing the detail tasks to realize a high-level just being displaced with the first 32-bit minicomputer, intentiΒ°n~, the VAX 780. The per seat cost of CAD was typically The goals included the speeding up and partial about US$100 000. Two or three shifts of operators were automation of design development through automatic necessary to justify the capital investment. detailing. Integration of design with analyses was Operation of CADD systems was complex; user proposed, so that the performances of a design (in interfaces were based on a large number of operations, terms of energy usage, costs, etc.) could be better each with its own arguments and usually accessed understood before they were fixed. The goals included through a tablet menu. Most users were specially checking designs for logic and consistency. These trained, full-time operators. Designers seldom had the changes seemed imminent, given the new power of patience to learn these systems, nor could they operate computing. Computers supported the scientific model them effectively enough to justify access to CAD of design espoused in the modern movement, and the stations. propsect of more 'rational' design prevailed 2.
Three-dimensional line drawings and perspectives By the mid-1970s, the first generation of CAD systems have been demonstrated since the early 1960s 3. There quickly evolved into powerful drafting editors, allowing was slow recognition that the object to be modelled the layout of a wide range of graphic primitives, the was not a drawing, but rather the artefact being composition of the primitives into symbols, cells and designed, such as a machine part, building or process layers, and the management of graphic information plant. Until the advent of solids modelling, however, using the electronic equivalent of pin-registered overlay 3D was thought of as a rendering tool. The first research drafting. The initial object to model within CAD systems solids modellers were developed in 19734 and the implications of developing a comprehensive building Graduate School of Architecture and Urban Planning, 405 Hilgard model for design were explored only a short time laterS'%