r

🎨 3D 预览 — 旋转阶梯

@StartRule
Lot --> Step(5)

Step(n) -->
  case n == 0 : primitiveCube(1, 1, 1)
  else        : primitiveCube(1, 1, 1)
                  t(0, 1, 0)
                  r(0, 30, 0)
                  Step(n - 1)