Height Control Mechanism/Singapore Use Case
Hy,
I have a question about the use case presented by the Singapore Urban Authority, creating a development scenario they created those three yellow views that they want to be preserved while developing the new neighborhood, any suggestions how can you create them?
As well they have a height control mechanism (screen shot 2) were they conditioned the new development to a certain height, any suggestion how this one can be coded?
Any leads will be much appreciated,
Thank you,
Mihai
Designing Our Future – Urban Redevelopment Authority - YouTube
Hello Mihai
Thank you for your question.
The CGA models are controlled by occlusion queries using the inside / overlaps / touches function—Esri CityEngine | ArcGIS Desktop .
I created a simple building rule that checks from top to bottom for floors outside an envelop and colors them red.
version "2017.1"
@Range(0,1,2)
attr LOD = 1
@Range(1,150)
attr maxFloors = 50
attr floorheight = 4
@StartRule
Lot --> offset(-3)
comp(f) { inside: Initial }
Initial --> extrude(maxFloors*floorheight)
FloorSplit
FloorSplit-->
case overlaps(inter, "limit"):
split(y){~1:FloorSplit | floorheight: Outside}
else:
case LOD < 1: Mass
else: split(y){~1:FloorSplit | floorheight: Floor}
Mass--> color("#0000ff")
Floor--> color("#00ff00") report("Floos",1)
Outside--> color("#ff0000") // or NILHere is an example how to create an view shed occluder, just draw a shape and add this rule:
version "2017.1"
@Range(5,500)
attr height = 100
@StartRule
Occluder --> extrude(world.up,height)
label("limit")
set(material.opacity,0.3)
Finally a slope occluder to control the height of a building. Just draw a shape representing an area that shall be visible from a given angle and add this rule:
version "2017.1"
@Range(1,89)
attr angle = 30
@Range(50,1000)
attr dist = 500
@StartRule
Waterfront --> extrude(world.up.flatTop,0)
comp(f) { top = Top }
Top --> extrude(world.up,1)
comp(f) { side= Sides }
Sides --> extrude(vertex.normal, dist)
comp(f) { back: Slope | all: NIL }
Slope --> roofShed(angle)
comp(f) { vertical: NIL |
bottom: NIL |
all: Occluder }
Occluder --> extrude(world.up,-1)
label("limit")
set(material.opacity,0.3)
Hi Thomas,
I tried using the code you have provided. But doesn't generates like you have shown in screenshots. Does occlusion works in same parcel/footprint .
Code Used
Code_1.cga :-
version "2016.1"
@Range(0,1,2)
attr LOD = 1
attr maxFloors = 50
attr floorheight = 4
@StartRule
Lot-->
offset(-3)
comp(f) { inside: Initial }
Initial-->
extrude(maxFloors*floorheight)
FloorSplit
FloorSplit-->
case overlaps(inter):
split(y){~1:FloorSplit | floorheight: Outside}
else:
case LOD < 1: Mass
else: split(y){~1:FloorSplit | floorheight: Floor}
Mass--> color("#0000ff")
Floor--> color("#00ff00")
Outside--> color("#ff0000") // or NILCode_2.cga :-
version "2016.1"
@Range(1,89)
attr angle = 30
@Range(50,1000)
attr dist = 500
@StartRule
Lot -->
offset(dist)
comp(f) { border: Slope }
Slope-->
rotate(abs,scope,-angle,0,0)
extrude(world.up,1)
comp(f){bottom: Visualisation}
Visualisation--> set(material.opacity,0.3)The example with the slope around a shape in the middle is a quite unusual use case.
To make this inter occlusion queries work, the Procedural Runtime preferences need to be adjusted:
neighborhood distance for inter-occlusion needs to be set to the maximum extend of the slope (attr dist in the cga rule above)
Please refer to the help for further explanations: Context (and Occlusion) Queries
Hi Thomas, sorry to disturb you again. I was trying to use the 30⁰ rule for a river but it is loosing shape while extruding.
Lot -->
extrude(world.up, dist)
comp(f) {front: Slope }
Slope -->
rotate(abs,scope,90-angle,0,0)
extrude(world.up,0.1)
Visualisation
Visualisation --> color(0,1,0) set(material.opacity,Transparent)
I am not able to figure out how to solve this.
Thanks in advance.
