CityEngine學習筆記（一）——shapeL

Synopsis 概要

具體語法

shapeL(frontWidth, leftWidth) { selector operator operations | selector operator 
operations }

shapeU(frontWidth, rightWidth, leftWidth) { selector operator operations | selector operator operations }

shapeO(frontWidth, rightWidth, backWidth, leftWidth) { selector operator operations | selector operator operations }

Parameters 參數

• frontWidth (float)
  Depth of front wing.
• leftWidth (float)
  Width of left wing.
• rightWidth (float)
  Width of right wing.
• backWidth (float)
  Depth of rear wing.
• selector (keyword)
  Semantic selection keyword:
  • shape: The setback polygon (i.e. the L,U or O shape)保留的房子的區域
  • remainder: Selects the remainder of the polygon.挖出來的空的區域
• operator
  The operator defines how the setback polygons are used to generate successor shapes. This also applies to shapes with more than one faces. Valid operators are:
  • : Each polygon is put into a new shape.
  • = All polygons corresponding to the selector are combined into one new shape.
• operations
  A sequence of CGA operations to execute.

The shapeL, shapeU, shapeO operations select a number of edges, depending on predefined spatial selectors, and set them back by a user-defined distance.

Related

• comp operation
• offset operation

Examples

L-Shapes

A block filled with L-shapes.

 

attr myFrontDepth = 5
attr myLeftWidth = 11

LotInner -->
    Lot
		
Lot -->
    offset(-3, inside)
    shapeL(myFrontDepth,myLeftWidth) { shape : Footprint | remainder: NIL }
	
Footprint -->
    extrude(rand(10,20)) color(1,0,0)
  

U-Shapes

A block filled with U-shapes.

attr myFrontDepth = 5
attr myRightWidth = 3
attr myLeftWidth = 11


LotInner -->
    Lot
		
Lot -->
    offset(-3, inside)
    shapeU(myFrontDepth,myRightWidth,myLeftWidth) { shape : Footprint | remainder: NIL }
	
Footprint -->
    extrude(rand(10,20)) color(1,0,0)

O-Shapes

A block filled with O-shapes.

attr myFrontDepth = 5
attr myRightWidth = 3
attr myBackDepth = 2
attr myLeftWidth = 11

		
LotInner -->
    Lot
        
Lot -->
    offset(-3, inside)
    shapeO(myFrontDepth,myRightWidth,myBackDepth,myLeftWidth) { shape : Footprint | remainder: NIL }

Footprint -->
    extrude(rand(10,20)) color(1,0,0)