Graphics Programs Reference
In-Depth Information
void. If they are, that relationship must be broken before you can change
their nature.
In an earlier example, you saw a multishape extrusion drawn as one
rectangle inside another to create a solid with its center hollowed out all
the way through (see
Figure 17.1
). If you did not want the open space in the
center to pass all the way through the solid, you could create multiple solids
that result in the desired form, or you could use a void form to cut out the
desired space in the solid, as shown in
Figure 17.14
.
Figure 17.14
Void geometry in a solid form
The file
Ch17_Modeling_SolidandVoid.rfa
is provided as an example
and can be found at
www.sybex.com/go/masteringrevitmep2015
.
When you create a void form while in the Family Editor, it will appear
in the 3D views as a transparent form and as orange lines in plan and
elevation views as long as it is not cutting any solid geometry. The void will
not automatically cut any solid geometry unless it is drawn overlapping the
solid geometry. So, if you were to draw a void form independent from any
other geometry in the view and then move the void so that it overlaps solid
geometry, the solid would not be cut.
You can tell the void form which solid geometry to cut by selecting it and
then clicking the Cut button on the Geometry panel of the contextual tab.
You can select the void or the solid geometry first and then select the other
to establish the cut relationship.
