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Paper Space/Model Space

From Draftsperson.net

Paper Space is a crucial part of the AutoCAD system. It is a method whereby the pure design-based linework can easily be integrated into neat scaled official drawings incorporating titleblocks, company logos etc.

Model Space

Model space is basically "the real world". When working in model space, no thought should be given to how the drawings shall appear coming out of the printer. Everything is drawn at a scale of one to one (where meters, millimeters or inches are the preferred drawing units) and all drawing componants are positioned at the correct distances from each other, regardless of what sheet of paper they may end up being printed on. The drawings may also be positioned on a specific coordinate system, such as a national mapping grid, in order to integrate accurately with other drawings.

Paper Space

Paper space is only entered come printing time. A typical paper space layout will consist of a standardised title block containing information about the drawing; drawing number, date completed etc. This title block will be drawn to accurately fit on a standardised sheet of paper. For example, a sheet of ISO A1 measures 841mm by 594mm. Thus, a titleblock for printing on such a sheet may measure 820 drawing units by 570. It can then be printed out at a scale of 1 to 1, and will fit on the page nicely.

Viewports

All this is of course well and good, but how do we get the actual drawing information from model space into this titleblock? To do this, we utilise an item known as a viewport. A viewport is a shape (usually a rectangle but can be any shape) that is drawn into paper space. Think of them as a TV screen. Inserting a viewport into paper spaces "places a camera" into model space. You can change the angle of view, the scale factor and many other variables in the viewport settings. These changes only effect this one viewport. This lets you have, for example, one large viewport of a building site at a scale of 1:100, and right beside it another showing a detailed area at a scale of 1:10. It's the same building site, and it exists only once in model space, but it is represented twice in two different ways in the final drawing. The obvious advantage of this is any changes made in model space will instantly update in every viewport, keeping all your printable drawings up to date.

Article credits: Content on this page came from various articles on en.wikibooks.org


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