Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010 User Manual page 363

Sample polygonal concrete
isolated foundation extrusion
Before you extrude the shape, you can specify its start and end points to increase or decrease the depth of
the form. By default, the extrusion start point is 0. The work plane does not need to be either the start or
end point of the extrusion – you only use it to sketch on and to set the extrusion direction.
The following procedure is a general method for creating a solid or void extrusion. Steps may vary depending
on your design intent.
To create a solid or void extrusion
1 In the Family Editor, on the Create tab
Click Solid drop-down
Click Void drop-down
NOTE If necessary, set the work plane before you sketch the extrusion. Click Create tab
Plane panel
2 Use the sketching tools to sketch the extrusion profile:
To create a single solid form, sketch a closed loop.
To create more than one form, sketch multiple, non-intersecting, closed loops.
3 To extrude the profile from the default start point of 0, on the Options Bar, for Depth, enter a
positive or negative extrusion depth.
This value changes the endpoint of the extrusion.
NOTE The extrusion depth is not retained after you create the extrusion. If you need to make multiple
extrusions with the same endpoint, sketch the extrusions, select them, and then apply the endpoint.
4 Specify the extrusion properties:
Click Create Extrusion tab
To extrude the extrusion from a different start point, under Constraints, for Extrusion Start,
enter a new point.
To set the visibility of a solid extrusion, under Graphics, for Visibility/Graphics Overrides,
click Edit, and specify the visibility settings.
Extrusion.
Extrusion.
Set.
Element panel
Forms panel, do one of the following:
Extrusion Properties.
Creating an Extrusion | 321
Work