Autodesk Revit’s Equality Dimension ‘Anchor’ Position

Many people are familiar with the ability to apply an ‘Equal’ constraint to a multi-segmented dimension in Revit. (Determine the dimensions witness line location, select the ‘EQ’ symbol, look out for the elements as they move.)

However, this blog is about how the elements move. Having applied the equal constraint, you will notice that one element will remain stationary while the associated elements move to maintain the equal constraint, this is referred to as the ‘Anchor’ and is identified via an icon.

Only one witness line of a multi segmented dimension can be an anchor, all the remaining witness lines will move relative to it. The easiest way to describe this feature is with a simple diagram.

equally constrained multi segmented dimension image

The image above shows a typical equally constrained, multi segmented dimension. The 4 yellow windows on the right will move to the red window on the left because it is the ‘Anchor’ as shown below.

Yellow windows moved relative to red anchor image

So how can we determine which witness line is defined as the anchor? As so often with Revit, we are shown a symbol, in this case, surprise, an Anchor.

Anchor Location Image

Select the equally constrained multi segment dimension, select an element which has a witness line adjoined, (shown green in the image above), move your cursor to displayed the ‘hidden’ dimension line and select it to display the anchor.

So how do I move the anchor?

Select the anchor symbol and drag it to another witness line.

How to move the anchor image

In the image above, the anchor has been moved to the centre witness line, therefore the remaining windows move relative to the anchor.

To find out about 'Autodesk Revit's Equality Dimension Display Options' just keep an eye on our blog for my next post.

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