"Mirror tool - ...allows you to mirror elements across an axis in order to create a mirror image of
an element ...either pick an existing reference in the model (the arrow icon) or draw the axis interactively (the pencil icon). ...Use the pick method when you have an existing element with a meaningful center axis. If nothing in the model exists as a mirror axis, use the Draw mode and draw your own axis."
"Arraying Elements - ...allows you to copy instances of an element with equal spacing between instances. Revit provides intelligent arrays that can be parametrically grouped and associated, as well as one-off, unassociated arrays. Like all the other tools we’ve reviewed, the creation options are presented on the Options bar."
"...two types of array: linear and radial.
Linear arrays - set as the default because they’re the most common. ...creates a series of elements in a line. Each element in the line can be given a set distance from the previous element or be spaced equally based on a maximum line length."
"radial array - works in a similar fashion, but it revolves around a center point. ...elements auto-rotate so that each element faces the center of the array..."
5.13.10 8:44pm-8:57pm = 13mns
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