Maybe your negative object is intersecting with a neutral group?

• Lets say you have a positive cube called 'positiveCube'.
• And a slightly smaller negative cube called 'negativeCube'.
• Now you position negativeCube, inside positiveCube and group them, making a holow cube.
• Lets call the resulting group 'hollowCubeGroup'.

You could say now say that:

hollowCubeGroup = (positiveCube - negativeCube) = (positive - negative)

By default, bryce now says:

postiveCube = positive
negativeCube = negative
hollowCubeGroup = neutral

• Now you make a negative rectangle, to cut out a window, lets call it 'negativeWindow'.
• position negativeWindow to intersect, with your hollowCubeGroup, where you want it to cut out a window.
• Now group 'hollowCubeGroup' and 'negativeWindow', creating a new group 'hollowCubeWithWindow'.

What happens is, you group a **negative **'negativeWindow' with a neutral 'hollowCubeGroup' creating:

hollowCubeWithWindow = (hollowCubeGroup - negativeWindow) = (neutral - negative)

In this case, it does not matter that 'positiveCube' inside 'hollowCubeGroup' is positive, because 'hollowCubeGroup' shields it from any further outside influences.

The solution is to make 'hollowCubeGroup' positive as well, so that:

*hollowCubeWithWindow *= (*hollowCubeGroup *- negativeWindow) = (*positive *- negative)

Which should then result in 'negativeWindow' cutting a nice window out of our 'hollowCubeGroup'.

@Note: To simplify things you could ofcourse group 'positiveCube' 'negativeCube' and 'negativeWindow' in one group, creating:

hollowCubeWithWindow = (positiveCube - negativeCube - negativeWindow) = (positive - negative - negative)

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