Part Boolean/ja

このコマンドはブーリアン用ツールを一つにまとめたものです。実行される操作と使用されるパラメーターを下記のダイアログから指定することができます。より手軽なブーリアン演算についてはPart Fuse、Part Common、Part Cutも見てください。

The Part Boolean command can perform four boolean operations. A task panel is used to specify the operation and the objects.

For quicker access to the boolean operations, use Part Cut, Part Fuse, Part Common and Part Section.

The Boolean Operation task panel

Usage

1. Optionally select one or two shapes.
2. There are several ways to invoke the command:
   • Press the Boolean... button.
   • Select the Part → Boolean → Boolean... option from the menu.
3. The Boolean Operation task panel opens.
4. Selected shapes are already checked in the shape lists.
5. Select the appropriate Boolean operation. Union, Difference, and intersection only accept solid shapes, Section also accepts non-solid shapes.
6. Optionally (un)check an item in the First shape list.
7. Optionally (un)check an item in the Second shape list.
8. Optionally press the Swap selection button to swap the shapes. This only makes sense for the Difference operation, as its result depends on the order.
9. Do one of the following:
   • Press the Apply button to confirm:
     1. A Fuse, Cut, Common, or Section object is created according to the selected operation.
     2. Optionally keep creating boolean objects.
   • Press the Close button to close the task panel and finish the command.

Coplanar problems

The boolean operations are performed by the internal geometry kernel, OpenCASCADE Technology (OCCT). This library sometimes has problems producing boolean results when the input objects share an edge or a face. To be sure the boolean operation is successful the recommendation is that the shapes intersect each other clearly; this means that in most cases, one shape should protrude or be larger in size than the other shape.

In cases of coplanarity, even if the first boolean operation succeeds, subsequent boolean operations may fail. In this case, the problem may not be in the last operation done, but in the older ones, that is, in the nested operations as indicated in the tree view. To troubleshoot these issues, it is recommended to use the Part CheckGeometry command to inspect all objects for problems.

Left: shapes that share a face, a boolean cut may produce incorrect results. Right: shapes that intersect each other clearly, the boolean cut will be successful in most cases.

Left: shapes that share a face, a boolean union may produce incorrect results. Right: shapes that intersect each other clearly, the boolean union will be successful in most cases.