# 界面熟悉

CityEngine的GetMapData有三类数据:

  • Basemap:地图遥感数据
  • Esri World Elevation:DEM数据
  • OpenStreetMap:一个关于街道的网站

# CGA规则文件

# 基本规则

CGA规则文件都是以规则构成的,定义一条规则形式如下:

规则名-->
    规则内容
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2

其中以@StartRule修饰的规则是最开始执行的规则。样例如下:

Start1-->
    extrude(30)
    build

@StartRule
Start2-->
    extrude(60)

build-->
    color(0,1,0)
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要查看各个规则之间的关系可以在Model Hierarchy中点击Inspect model。要补全命令可以使用alt+/

来看下具体操作每个面,并且有贴图的操作:

version "2020.0"
# 开始文件

attr height = rand(9,24)

@StartRule
Start1-->
    extrude(height)
    build

Start2-->
    extrude(60)

build-->
    comp(f){front:frontArea |
    back:backArea |
    left:leftArea |
    top:topArea |
    right:rightArea |
    bottom:bottomArea
    }
frontArea-->
    #红色
    color(1,0,0)
backArea-->
    #绿色
    color(0,1,0)
leftArea-->
    #蓝色
    color(0,0,1)
topArea-->
    roofGable(30)
    roofTexture

roofTexture-->
    comp(f){
        bottom:bottomSide|
        vertical:verticalSide|
        top:topSide
    }


topSide-->
//bottomSide-->
    setupProjection(0,scope.xy,scope.sx,scope.sy)
    texture("roof/florence_roof_tex_05.jpg")
    projectUV(0)

verticalSide-->
    setupProjection(0,scope.xy,scope.sx,scope.sy)
    texture("roof/florence_roof_tex_05.jpg")
    projectUV(0)

rightArea-->
    setupProjection(0,scope.xy,scope.sx,scope.sy)
    texture("florence_facade_12.png")
    projectUV(0)
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# 函数库

CityEngine的函数库分为:

  • Operations Geometry creation Geometry subdivision Geometry manipulation Texturing Transformations Scope Flow control Context Attributes
  • Shape attributes
  • Built-in functions
  • Other keywords
  • CGA utility functions library
  • Miscellaneous information

# 注释

行注释//,#

段注释 /* */

# 相关资料