Bryce

 Tutorial: Boolean Operations

 

No Operations
As you might imagine by now, a no operation is one in which nothing takes place. This happens when you have two objects in a group that have the same boolean attribute or one of the two objects is set to Neutral. They don't affect each other but may affect other objects in the same group with different settings.

Here is a render and wireframe of two spheres, both positive. As you can see, Bryce acknowledged the boolean settigs and clipped the corners of the group bounding box but since both are positive, nothing happened.
Here again, same group, only two negatives.
And here we have the group again, with two intersect spheres.

And the last possible combination, one negative and one intersect. The sphere on the right is negative, the left is intersect.

Any other combination other than what is listed here will result in either a negative or intersect boolean operation.

There is no practical difference in grouping two of the same boolean attributed objects and grouping one neutral and any of the boolean attributes. Since neutral is simply that, neutral. It performs no operation nor are operations performed on it. It will always render in its entireity.