In the figure, the angle between the "box" faces is 90 degrees. If the angle between the "box" faces is greater than 90 degrees, it will break, and then it can be divided into six faces.
Look at the third object, the angle between the faces is 30 degrees, 40 degrees, 100 degrees, 150 degrees....
If the face angle is greater than 90 degrees, the fracture will occur (if the face angle is less than 90 degrees, the fracture will not occur.)
If you can use the angle between faces to judge, you can make the face fracture operator more free and the fracture shape more beautiful.
Look at the third object, the angle between the faces is 30 degrees, 40 degrees, 100 degrees, 150 degrees....
If the face angle is greater than 90 degrees, the fracture will occur (if the face angle is less than 90 degrees, the fracture will not occur.)
If you can use the angle between faces to judge, you can make the face fracture operator more free and the fracture shape more beautiful.