English: Two volumes and several points with a mixture of positive and negative polarities are shown. The intersection contributed by a point is its polarity times the polarity of the volume that contains the point. The total intersection amount in this image is: N = (+1)x(+1+1+1-1-1) + 0x(+1+1-1-1-1) + (-1)x(+1-1) = +1.
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