写出用cityegine制作弯头管件的cga规则

以下是一个简单的用CityEngine制作弯头管件的CGA规则：

version "2019.0"

@RangeOperations
attr length = 10
attr radius = 2
attr angle = 45

Lot -->
  comp(f) { 
    // Create the main cylinder
    baseCylinder(length, radius)
    // Create the curved section
    rotate(z) { 
      translate(0, radius, 0) { 
        // Create the curved cylinder
        curvedCylinder(radius, angle) 
      } 
    } 
  }

// Define base cylinder shape
@RangeOperations
attr baseHeight = 0.2
@RangeOperations
attr baseRadius = 2
@RangeOperations
attr baseSides = 16

@Hidden
attr _baseCylinder = cylinder(height: baseHeight, radius: baseRadius, sides: baseSides)

@StartRule
attr baseCylinder(height, radius) =
  extrude(height) { 
    setupProjection(0, scope.xy, scope.xz)
    _baseCylinder 
  }

// Define curved cylinder shape
@RangeOperations
attr curvedHeight = length
@RangeOperations
attr curvedSides = baseSides

@Hidden
attr _curvedCylinder = cylinder(height: curvedHeight, radius: baseRadius, sides: curvedSides)

@StartRule
attr curvedCylinder(radius, angle) =
  split(rotate(y, angle)) { 
    setupProjection(0, scope.xy, scope.xz)
    _curvedCylinder 
  }

这个CGA规则定义了一个Lot，其中包含一个主要的圆柱形部分和一个弯曲的部分。主要的圆柱形部分由基础圆柱形状定义，而弯曲的部分由弯曲的圆柱形状定义。通过使用CGA操作，这些形状被组合起来，形成弯头管件。