topic Re: Modelling buildings based on Building Coverage Ratio (BCR) and FAR values in CE in ArcGIS CityEngine Questions

Modelling buildings based on Building Coverage Ratio (BCR) and FAR values in CE

JafarNajafli — Mon, 04 Dec 2017 08:42:10 GMT

Hi all,

I'm aware that similar questions have been asked before but none of the solutions have worked for me.

Basically I have to model my buildings based on the target Building Coverage Ratio, Setback Distances and FAR values given by the client. To do this I start with defining my setback distances which leaves me the footprint area. After this point I was able to figure out how to extrude my buildings based on FAR values although I cannot find a way of how to restrict the footprint area to a certain percentage of the parcel and also interconnect both the BCR and FAR values.

I attached a screenshot too that can be helpful to understand what I want to achieve.

Any input will be appreciated (:

/**
* File: rule1.cga
* Created: 30 Oct 2017 11:36:07 GMT
* Author: Jafar Najafli
*/
@StartRule

attr Layer="PL_KONUT"
attr frontSetback = 3.5
attr backSetback = 3
attr sideSetback = 3
attr floorheight= 3
const parcelarea = geometry.area()

attr FAR = 1
attr BCR = 0.2

Parcel-->
case parcelarea > 1000:
NIL
else:
setback(frontSetback) {street.front: NIL | remainder :
setback (backSetback) {street.back: NIL | remainder:
setback (sideSetback) {street.side: NIL | remainder: footprint
   }
      }
         }

footprint-->
extrude(world.up.flatTop, floorheight*(parcelarea/geometry.area()*FAR)) Building
report ("Height", scope.sy)

Building -->
report ("floorarea", geometry.area(bottom))
report ("FAR", geometry.area()/parcelarea)
report ("BCR", geometry.area(bottom) / parcelarea) ## this reports an accurate calculation of building coverage ratio, although it does not work as a modeling function
split(y){floorheight:zemin|{floorheight:arakat}*|floorheight:catikat}
comp(f){side:cephe}

Re: Modelling buildings based on Building Coverage Ratio (BCR) and FAR values in CE

AbhishekSobbana1 — Mon, 11 Dec 2017 07:15:36 GMT

Hi,

GFA & FAR Calculations with CityEngine - YouTube, I hope this tutorial will help you to figure out FAR.

Regards

Abhishek

Re: Modelling buildings based on Building Coverage Ratio (BCR) and FAR values in CE

JafarNajafli — Tue, 12 Dec 2017 07:15:37 GMT

thanks for the link @Abhishek, I am familiar with that tutorial and it has helped me to write my rule to extrude my buildings based on FAR. But like I mentioned in my thread, my main issue here is restricting the Building Coverage Area.

For example, I want my footprint area to cover only 50% of the whole parcel and then extrude my building from that footprint. Hope I was able to explain what I want to do (:

Re: Modelling buildings based on Building Coverage Ratio (BCR) and FAR values in CE

AbhishekSobbana1 — Tue, 12 Dec 2017 09:03:37 GMT

My best guess is, you can try SplitArea function, lets say BCA is 0.5 (50% of ground cover)

splitArea(x) {(geometry.area*(1-BCA)) : GreenSpace | ~1 : Extrude_Building}

I hope this helps you.

Regards

Abhishek

Re: Modelling buildings based on Building Coverage Ratio (BCR) and FAR values in CE

AzemKURU — Sun, 27 Dec 2020 12:57:51 GMT

Hi Jafar,

Did you find a solution for your problem.

I have a similar project which I want to show possible 3D building with given FAR, BCR and setbacks.

If so, is it possible to share it.

Thanks in advance.