8

Boolean Operation 1013
B ool ean Oper ati on
The fence is operand A, and the cat is ope rand B.
Upper left and right: A minus B
Second to upper left: B minus A
Second to lower lef t: Union
Lower left: Intersection
A Boolean object combines two objects by
performingaBooleanoperationonthem. In
the software, a B oolean object is made from two
overlapping objects. The original two objects are
the operands (A and B) and the Boolean object
itself is the result of the operation.
For geometry, the Boolean operations are:
• Union: The Boolean object contains the volume
of both original objects. The intersecting
or overlapping portion of the geometry is
removed.
• Intersect ion: The Boolean object contains
onlythevolumethatwascommontoboth
origina l objects (in other words, where they
overlapped).
• Subt ra ction (or d i f fer ence): The B oolean
object contains the volume of one original
object with the intersection volume subt rac ted
from it.
Bound Vertex
Binding spline ver tices v ia the Refine and Bind
functions in
Editable Spline (Vertex) (page 1–292)
is useful for connecting splines whe n building a
spline network for use with the
Surface Modifier
(page 1–833)
.
Bound vertices are black, allowing them to be
easily distinguished from standard vertices. You
cannot move a bound vertex directly. However ,
changing the segment length by scaling it or by
moving a connected vertex causes the bound
vertex to shift its position in order to remain at
the segment’s midpoint. You can change a bound
vertex’s type (right-click the vertex, and then
choose the type from the bottom of the rig ht-click
menu), and if you convert it to a Bezier or Bezier
corner, you can manipulate its handles.
Bounding Box
Bounding box shows the extents of the mod el boat.
Theboundingboxisthesmallestboxthatencloses
the maximum dimensions or
extents (page
3–1030)
of an object.
You can display selected objects in the scene as
bounding b oxes to speed up screen redraw. Use
the
Object Properties dialog (page 1–111) .