all standard Bryce primitives can participate in boolean operations, so I'm not understanding your question.

the very first boolean operation I did with Bryce 2 was to use a negative torus to cut a tunnel through a positive terrain shape.

if it wasn't for boolean operations in Bryce 2, I never would have moved up from Bryce 1.  I hated Bryce 2 when it first came out, but the lure of boolean operations made me persevere.

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