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Fun with Quarter Circles - Rounded Squares

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01-03-2020 01:16 PM
by Anonymous User
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‎01-03-2020 01:16 PM

#CityEngine #quarterCircle #roundedSquares #CGA #roundedBuildings

Once again, I'm a new CityEngine user and didn't see anything describing these findings so I'm going to share:

Taking my "quarter circle" (32 sided disc) studies a step further, I developed CGA for a footprint with four 90 degree corners.  I don't know if I did the best coding ever (more on that) but I got the result I intended in the end.  The code works on squares, rectangles and even circles(?).  But not on oddly angled rectangles or triangles (see bottom and bottom left).  I think this code would work well inside of another "grided" code (x and z splits so that it's all very "sqaure").

To create these shapes I used the primitiveDisc splits as described in my first post.  But each corner gave me some problems so I separated them individually "Z1,Z2,Z3,Z4" and tweaked any translation/pivot issues individually.

Rounded corners on various footprint shapes

/**
 * File:    FourBldgCorners.cga
 * Created: 17 Dec 2019 20:40:03 GMT
 * Author:  bwamsley
 */

version "2019.1"

///////////////
##Attributes
@Range(min=1,max=100, restricted = false)
attr CornerBendRadius = 20
@Range(min=1,max=100, restricted = false)
attr BuildingH = 20
@Range(min=1,max=100, restricted = false)
attr CornerH = 20

################################
@Start

Footprint-->
	alignScopeToGeometry(yUp,0,0)
	FootprintSplit
	
FootprintSplit-->	
	split(x){CornerBendRadius: CornerBendX1
			|~1				:  BuildingWidth
			|CornerBendRadius: CornerBendX2}
			
CornerBendX1-->
	split(z){CornerBendRadius: CornerBendZ1
			|~1				:  BuildingWidth
			|CornerBendRadius: CornerBendZ2}
			
CornerBendX2-->
	split(z){CornerBendRadius: CornerBendZ3
			|~1				:  BuildingWidth
			|CornerBendRadius: CornerBendZ4}			
			
/////CornerZ1 (DARK BLUE)
CornerBendZ1-->
	primitiveDisk(32)
	CircleZ1 

CircleZ1-->	
	color(0,0,1)
	split(x){'.5 : halfCircleZ1
	|'.5 : NIL}
	
halfCircleZ1-->
	split(z){'.5 : quarterCircle1
	|'.5 : NIL}	
	
quarterCircle1-->
	setPivot(xyz,2)
	t(-(CornerBendRadius/2),0,-(CornerBendRadius/2))
	s(CornerBendRadius,0,CornerBendRadius)
	BuildingCurve			

/////CornerZ2 (TEAL)
	
CornerBendZ2-->
	primitiveDisk(32)
	CircleB 
	
CircleB-->	
	color(0,1,1)
	split(x){'.5 : halfCircleZ2
	|'.5 : NIL}
	
halfCircleZ2-->
	split(z){'.5 : NIL
	|'.5 : quarterCircle2}
	
quarterCircle2-->
	setPivot(xyz,1)
	t(-(CornerBendRadius/2),0,-(CornerBendRadius/2))
	s(CornerBendRadius,0,CornerBendRadius)
	BuildingCurve		

/////CornerZ3 (RED)

CornerBendZ3-->
	primitiveDisk(32)
	CircleC 
	
CircleC-->	
	color(2,0,0)
	split(x){'.5 : NIL
	|'.5 : halfCircleZ3}
	
halfCircleZ3-->
	split(z){'.5 : quarterCircle3
	|'.5 : NIL}	

quarterCircle3-->
	setPivot(xyz,3)
	t(-(CornerBendRadius/2),0,-(CornerBendRadius/2))
	s(CornerBendRadius,0,CornerBendRadius)
	BuildingCurve			
	
/////CornerZ4 (PURPLE)	
	
CornerBendZ4-->
	primitiveDisk(32)
	CircleD 
	
CircleD-->	
	color(1,0,1)
	split(x){'.5 : NIL
	|'.5 : halfCircleZ4}
	
halfCircleZ4-->
	split(z){'.5 : NIL
	|'.5 : quarterCircle4}
	
quarterCircle4-->
	t(-(CornerBendRadius/2),0,-(CornerBendRadius/2))
	s(CornerBendRadius,0,CornerBendRadius)
	BuildingCurve
	
BuildingCurve-->
	extrude(CornerH)	
	
BuildingWidth-->
	color("#E3CF57")
	extrude(BuildingH)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

If any one knows of a better way to organize the scopes and pivots to simplify my code, I would be grateful to learn.

Hope this helps some one!!

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