geometry.isConcave

🎨 3D 预览 — 是否凹面

@StartRule
Lot --> primitiveQuad(8, 6)
        shapeL(3, 2)
        case geometry.isConcave : color(0.8, 0.4, 0.2)
        else                      : color(0.2, 0.8, 0.4)