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🎨 3D 预览 — 概率分支

@StartRule
Lot --> primitiveCube(6, 4, 0.2)
        extrude(5)
        comp(f) { top: Roof | side: Wall }

Roof --> color(0.5, 0.25, 0.15)

Wall -->
  30% : color(0.8, 0.2, 0.2)
  30% : color(0.2, 0.8, 0.2)
  else : color(0.2, 0.2, 0.8)