Because PowerBoolTree saves the original objects
there are many ways to use it to
effect major Editing changes on the final result. It is possible for
example to use the
PowerFillet command to fillet edges of the primitives and apply fillets to the
input
objects. You can do any editing operation that does not change the ID of
the object.
Boolean operations can be undone by selecting the operation in the tree view of
the
PowerBoolTree dialog and then clicking on the "Remove Operation"
button. Using the
Rhino Undo command on the PowerBoolTree command should be avoided at this point.

There are three ways to see the original objects to edit them. You can
select
Show Objects in the PowerBoolTree dialog or you can use the Edit/Visibility/Show
in the main menu bar or Rhino. The "Show" menu is faster because it does
not
require the evaluation of the Boolean tree. Even better, you can use the
docked PowerBoolTree
dialog to select the objects in the tree view. If you click on the object
in the tree view
of the PowerBoolTree dialog it will highlight the object in the graphics
window. Once the
object is selected you can move it to a new location. Then if you click on
the "OK"
button in the PowerBoolTree dialog, it will update the Boolean result.

The Original objects are shown here in their original position.

We can use Rhino transformation commands to change the position of the objects.
In this
case we have moved two of the cylinders from the corners to the middle.

If the "Automatic Update" option is checked, you will see the result
above (the holes will be
regenerated as you move the cutting cylinders). If "Automatic
Update" is not checked, click
on the "Update Boolean" button to see the result change.
This evaluates all operations in the
tree.

To change the Operation Type performed you need to first select the operation in
the
list box. Then use the Operation pull down to change it. In this
case we change
from a Difference to a Union of the large cylinder.

The change produces this result. Note that the Chamfer is still applied
even though the Operation
type has changed.

Another useful operation is to change the order of the Operations. The
order
number is the first number in each line. Notice that we have changed the
order of this operation from 4 to 2 in the dialog. The result is shown
below.

Here we have changed the Cylinder Difference operation from 4th to 2nd so that
it gets applied
before the top Union of the Extrusion. We have also changed the operation
back to a Difference
so that the result may be seen. Note that the cylinder only drills a hole
in the objects before
it in the Tree.

Replacing one or more objects in an Operation is simple. Just open the [+]
at
the beginning of the line and you will see a list of objects. As you
select the
objects they will be highlighted on the Rhino screen. This will enable you
to
easily determine which object you wish to remove. Once you have the
correct
object you can remove it using the "Remove Object" button.

Adding a new object into an existing operator requires that you first select the
operation and then hit the "Add Object" button.

In this case we select the Blue Box to replace the Cylinder.

You can see the results of our edits here from below. Note that the
filleting still gets applied
automatically to the Box edges because it is inside of an operation that has
filleting turned on.

It is possible to change the accuracy of the operations. In some cases
this may
make a case work that fails otherwise. Here we have selected "Very Low"
which
sets the accuracy to 1/1000th of the size of the object. This accuracy effects
non-analytical fillets. Fillets which are not cylinders or torii will have
more or less
knots depending upon the Boolean and Fillet Accuracy.

Fillet between a Cylinder and a NURB at "Very Low" accuracy.

Fillet with "Medium" accuracy.

Fillet with "Very High" accuracy.
You can find out more about modifying the Automatic Filleting Operations Here.