What is CAD?

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CAD (What is it?)

Computer aided design gives the illustrator a new tool. It uses computer power to digitally store and resolve exact information about any form the designer defines. -D CAD allows users to easily make perfectly scaled plans and elevations that are simple to edit and plot, extract lists of objects or calculate the optimal use of materials. -D CAD exponentially extends the powers of the illustrator-designer allowing the creation of models that contain precise data about forms as they would exist in space. With suitable software and skill these -D models may be scaled, rotated, mirrored and sectioned without distortion. They then may be rendered with perspective, surface textures, reflections, shadows, within environments or simply as projected line drawings. The computer is able to keep all the necessary information organised while it performs the millions of calculations necessary to do CAD, thanks to the brilliant work of imaginative mathematicians and software developers who are currently striving to make ever more efficient algorithms and stable code.

Modeling, Drafting and Rendering (Paper and Pencils)

With pencil and rule a competent draftsperson can calculate the geometry of a complex object but each view of the object must be replotted (a laborious and very complex process in the case of perspective rendering). Since the designer is relying upon the pencil and paper (the former being generally too big and the latter too small) to act as geometrical calculators, errors may be introduced, intersections confused and time is lost. Typically, hand drawn construction drawings have some degree of ambivalence because one view often contradicts another. One well conceived and executed -D CAD model, if transported through every step of the design process from designer to client to designer to engineer to draftsperson to illustrator to contractor to detailer to client to tradesman etc. really reduces misunderstandings and improves efficiency. The credibility of those who design will be immeasurably improved if they can successfully incorporate CAD into their routine. Conventional media will always have at least two places in the process, allowing the unique expression of the hand in rendering CAD generated perspectives and for sketching initial concepts in order to convey them to the CAD designer. Otherwise, the surest way to a design that does not stumble over its own inconsistencies and omissions is to generate one -D model that is checked, criticised, corrected and embellished by all concerned parties as it moves toward realisation.

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CAD (value?)

The savings of having a single, consistent, complete digital model (or information set) that can be rendered as a pretty picture, material list or instructions for production machinery or workers, is obvious. Ask any automobile manufacturer. Economy of scale has already forced them to fully implement CAD into their creative and production processes. Since the middle of 14, affordable, powerful personal computers and elegant, robust software packages have been available so that individual designers and architects may now also partake in this inevitable revolution. To date the implementation of these new tools in the construction field is limited. Most architects, civil engineers and designers are still caught between pencils and plotters and have as yet realised little gain from CAD. Often we are embarrassed by our ignorance of computer technology. We should shed our shame and appreciate that with such rapid development everyone is ignorant, but for the bold and inquisitive, a new level of competence is at hand.

CAD (try it!)

The architect who wishes to try a little advanced CAD might start by engaging a competent -D CAD illustrator-draftsperson for a project. Involve him or her fully from the beginning by explaining your concept with words and sketches and have them model your idea directly. (Do not waste time drafting plans and elevations at this stage.) Take the time to study their progress and do not be alarmed if they find many unresolved intersections and things that dont work. This is normal. The power of -D CAD is revealing itself. Isnt it preferable that the exact geometry of your creation be appreciated by you now rather than in eight months when the general contractor calls to tell you the stairs dont fit? When you and your illustrator are satisfied with the design have them render some images for your clients approval. (Spending time and money on printing at this phase is not necessary if your client can come in and study your progress on the monitor, access GIF images via the internet like the ones in this article or be sent a video of screen captured images.) Keep up this process. Unity and precision are the watch words for productive implementation of CAD. Make one model, stick with it for assured consistency and trust its ongoing accuracy. Involve contractors with pertinent expertise to verify details, if necessary. When your model is acceptable (refined to perfection) have your illustrator produce some perspective renderings and print them. These are useful not only as confirmation documents for your client but they also help contractors appreciate your intent. Then have the illustrator generate -D plans and elevations directly from the model. You may wish to import these drawings into your own computers drafting software in order to annotate and detail them, have the illustrator print them and annotate them by hand or have the illustrator do all the annotations appreciating that this takes some time and he or she will require specific instructions as to what you expect and require. A printed document at this juncture is appropriate in order to make the design concrete, but as the project continues encourage contractors or subs to obtain a diskette of the model if they also use CAD so that they may take advantage of the established geometry contained therein. If your client is agreeable have the digital model updated with site dimensions as the building progresses and submit diskettes containing the model and all derivative CAD shop drawings to the owner on completion. After having studied the tools and techniques of a competent CAD designer throughout one project and having seen the resulting error-free plans, you may wish to upgrade your hardware, software and skills and empower yourself with CAD.

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