setbackToArea

🎨 3D 预览 — 按面积退界

@StartRule
Lot --> primitiveQuad(8, 6)
        setbackToArea(20)
        extrude(5)
        comp(f) { top: Roof | side: Wall }

Roof --> color(0.5, 0.25, 0.15)
Wall --> color(0.75, 0.72, 0.68)