CityEngine创建不同类型的屋顶（二）

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3.复杂坡顶

复杂坡顶无法通过CityEngine提供的单一函数就能完成，往往需要多个函数组合使用。更多的依赖于我们建筑屋顶的认识。

半四坡顶（half hip）

参考规则如下：

attr roofAngleGable=25 #屋顶下部坡度

attr roofAngleHip=25#顶部坡度

Lot-->

extrude(20)

comp(f){top:color("#0000ff")TopFacade |side:color("#ff0000")SideFacade. |all:NIL}

TopFacade-->

roofGable(roofAngleGable)

split(y){ '0.5: comp(f){bottom: NIL | horizontal:RoofHip |aslant:FlatRoof_Tex. | all:color("#00ff00")RoofSide. }}

RoofHip-->

roofHip(roofAngleHip)

FlatRoof_Tex.

歇山顶

歇山顶是我国古代建筑屋顶样式的一种。

参考规则如下：

attr roofAngleHip=30#屋顶下部坡度

attr roofAngleGable=30 #屋顶上部坡度

attr overHang=0.4#延伸出来的长度

Lot-->

extrude(20)

comp(f){top:color("#0000ff")TopFacade |side:color("#ff0000")SideFacade. | all:NIL}

TopFacade-->

roofHip(roofAngleHip,overHang)

split(y){ '0.5: comp(f){bottom: NIL | horizontal:RoofGable|all:FlatRoof_Tex. } }

RoofGable-->

roofGable(roofAngleGable)

comp(f){bottom:NIL | aslant:FlatRoof_Tex. | side:color("#00ff00")RoofSide.}

复斜屋顶

参考规则如下：

attr roofAngleGable=40 #屋顶下部坡度

attr roofAngleGable02=25#顶部坡度

Lot-->

extrude(20)

comp(f){top:color("#0000ff")TopFacade |side:color("#ff0000")SideFacade. |all:NIL}

TopFacade-->

roofGable(roofAngleGable)

split(y){ '0.5: comp(f){bottom: NIL | horizontal:RoofGable |aslant:FlatRoof_Tex. | all:color("#00ff00")RoofSide. }}

RoofGable-->

roofGable(roofAngleGable02)

comp(f){bottom:NIL |aslant:FlatRoof_Tex. | all:color("#00ff00")RoofSide. }

双重斜坡屋顶

参考规则如下：

attrroofAngleHip=40 #屋顶下部坡度

attrroofAngleHip02=25 #顶部坡度

Lot-->

extrude(20)

comp(f){top:color("#0000ff")TopFacade | side:color("#ff0000")SideFacade. | all:NIL}

TopFacade-->

roofHip(roofAngleHip)

split(y){ scope.sy*0.3:comp(f){ bottom:NIL |horizontal: RoofHip | all:FlatRoof_Tex. } }

RoofHip-->

roofHip(roofAngleHip02)

FlatRoof_Tex.

拱顶

参考规则如下：

attr curvedAngleResolution=15#相邻顶面的坡度差

@Hidden

attr ArcNum01=90/curvedAngleResolution-1

@Hidden

attr calcSegmentHt(ArcNum)= 3* (cos(ArcNum*curvedAngleResolution) - cos((ArcNum+1)*curvedAngleResolution))

Lot-->

extrude(20)

comp(f){top:color("#0000ff")VaultRoof(ArcNum01) |side:color("#ff0000")SideFacade. |all:NIL}

VaultRoof(n)-->

case n> 0:

roofGable(n*curvedAngleResolution,0,0,false,0)

split(y){ (calcSegmentHt(n)):comp(f){bottom:NIL | horizontal: VaultRoof(n-1) | aslant:FlatRoof_Tex. |all:color("#00ff00")RoofSide.}}

else:

comp(f){bottom: NIL | all:FlatRoof_Tex. }

圆屋顶

参考规则如下：

attr curvedAngleResolution=15#相邻顶面的坡度差

@Hidden

attr ArcNum01=90/curvedAngleResolution-1

@Hidden

attr calcSegmentHt(ArcNum)= 3* (cos(ArcNum*curvedAngleResolution) - cos((ArcNum+1)*curvedAngleResolution))

Lot-->

extrude(20)

comp(f){top:color("#0000ff")DomeRoof(ArcNum01) |side:color("#ff0000")SideFacade. |all:NIL}

DomeRoof(n)-->

case n> 0:

roofHip(n*curvedAngleResolution)

split(y){ (calcSegmentHt(n)):comp(f){ bottom:NIL |horizontal:DomeRoof(n-1) |all:FlatRoof_Tex.} }

else:

comp(f){bottom: NIL | all:FlatRoof_Tex.}