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NOTE Because the tread depth must be the same for each tread, the
tread edge line will pivot around the construction line.
7 When you have finished moving tread ends, you can click the
Exit Edit Turns grip to return to the default stair edit mode, or
right-click and click Deselect All to turn off grips.
Working with Stair Body Modifiers
Body modifiers use the three-dimensional (3D) geometry of an object, such
as a mass element or a mass group, to add to or subtract from a stair component
(tread, riser, or stringer depending on the stair style). Body Modifiers only
work on a single instance of a tread, riser, or stringer at a time.
After you create a body modifier from an object, you can delete the original
object. However, if you have created a complex object, such as a mass group
comprising many mass elements, you may want to retain the object in the
drawing until you are sure you have the results you want for the stair.
Adding a Body Modifier to a Stair Component
Use this procedure to create a body modifier and add it to a stair.
You can create a three-dimensional (3D) body modifier from a mass element,
a mass group, or any other AEC object with mass. You can also create body
modifiers from ACIS solids or blocks that form 3D bodies. You must place the
object in the location you want in the drawing before defining the object as
a body modifier.
The following illustration shows you how to use a mass element as a body
modifier to add to a stair stringer component.
2198 | Chapter 27 Stairs
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