Page 775 - Kitab3DsMax

Chapter 27: Working with Compound Objects
Note
Unlike many CAD packages that deal with solid objects, Max’s Booleans are applied to surfaces, so if the surfaces
of the two objects don’t overlap, all Boolean operations (except for Union) will have no effect. n
FIGURE 27.24
Object before any operations and with Boolean operations: Union, Intersection, Subtraction, and Merge with the
Imprint option enabled

The Attach operation combines the objects like Union but keeps them as separate elements of the same
compound object. For example, if you were to look inside a compound object created with Union, you
would not see the interior polygons of the combined object, but with Attach, the interior polygons would
still be there.
The Insert operation subtracts the second object from the first and then combines the two objects into one. If
the subtracted volume makes a dent or hole into the first object, then that hole remains after the two are com-
bined, but if the second surface has access to the first object through a hole, then the first surface covers the
subtracted volume. In Figure 27.25, two tube objects have been overlapped with a box object. The left tube is
capped at the bottom, forming a closed volume, but the right tube is open at the bottom. When made into a
ProBoolean object with the Insert operations, the closed volume is subtracted, but the open volume is not.
The Cookie option causes the operation to cut the original object without adding any of the faces from the
picked object to the original object. The Imprint option causes the outline of the operation to appear on the
original object.
All Boolean operations are added in the order in which they are applied to a list in the Parameters rollout.
You can select any of the operations in the list at any time and change the operation. For example, if you
select the Subtraction operation from the list and then change the operation type to Union and click the
Change Operation button, the Subtraction changes to a Union. With an operation selected in the list, the
Extract Selected button restores the original object. When using this button, you can choose to Remove,
Copy, or Instance the operation.

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