This 19 minute lesson examines layers and layer combinations. Layers are used in ArchiCAD to organize elements and are the primary means to control their visibility.
A key principle is that you need to have enough layers to be able to show and hide related groups of elements properly for all construction documents as well as all design phases. If two elements need to be shown at different times, such as furniture (which will not be seen on a floor plan for construction documents, but will be seen on a presentation plan) and fixtures or cabinets (which will be seen on both of these plans), then you need them on different layers. On the other hand, if certain elements are always turned on or off together (e.g. lower cabinets and railings), even though they are different types of elements they may be combined onto a single layer.
Similarly, one needs a layer combination for each drawing (e.g. floor plan, reflected ceiling plan, site plan, plus ones for other drawing types such as elevations, sections, etc.) and also for each typical phase of work (design, presentation, and possibly other special ones for creating objects, working on building structure, etc.).
Some layers such as exterior walls are seen on most layer combinations; others are visible on several layer combinations; and some specialized layers may only be seen in a single combination. For example, a single layer may be used to put a variety of element types (electrical components, text annotation, labels, dimensions, linework, etc.) that are only going to be seen on the electrical plan.
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