When you design a roof frame, you are in effect creating a whole series of custom pairs of reference planes in a simple and elegant manner - we will see how this is done in the next exercise. Tip: Elements can also be associated with reference planes that do not necessarily envelop the element.Ĭ = Component top level with offset attached to the upper reference planeĭ = Component bottom level with offset attached to the lower reference plane If no custom reference plane has been defined, then the elements default to the default reference planes. All the components attached with reference planes update to meet the envelope defined by the reference planes between which they are located. You can define as many custom pairs of reference planes as you like in a drawing file and these take precedence over the default pair. These planes (there are always two) can be inclined at any angle and any height that you assign to them. You can define the outline of the planes in plan - any shape you wish. However, they do not stretch to infinity.
These reference planes come in pairs, too. In this case, custom reference planes are used. Default reference planes do not afford the possibility of accounting for height differences within a component - sloping walls, for example.
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