Hi Mike,
>>Tell me, is there any reason why vMagnitude (Large circle radius) can be negative, so a range of -30 to +30 instead of simply 0 to 30?<<
Yes the range could be simply 0 to 30, but if you dial from start to finish you'll see that the extremes (-30, 30) are not identical.
It is similar to curves/polygon node setting "TYPE" "inscribed" / "circumscribed".
Have a great weekend
James
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