自然对数(同 ln)。
log(x)
attr x = log(x)
@StartRule Lot --> Tower(8) Tower(n) --> case n == 0 : NIL else : primitiveCube(log(n + 1) * 2 + 1, 1.2, log(n + 1) * 2 + 1) t(0, 1.3, 0) Tower(n - 1)