CGA : FAR calculations

MatthiasBuehler1

Hi !


I've been asked to provide a few simple examples of how to work with the 'FAR' value in CE.

Hereâ??s 2 examples :

1] is very easy and shows how the FAR can be calculated with CGA, given an attribute with the parcel area.

2] is abit more complex. The 2 images show some details of this second example.

Note that the 2nd example shows how :
a] the â??parcelAreaâ?? object attribute of an other shape ( parcel Shape ) is sampled
b] a recursion is used to create as many floors as possible until the target FAR is reached.
[ATTACH=CONFIG]23447[/ATTACH]

[ATTACH=CONFIG]23448[/ATTACH]
[ATTACH=CONFIG]23449[/ATTACH]

I'm sure there's more questions .. Let me know ..

Matt

FAR_Examples.zip

parcelAO.png

attrMapping.png

Anonymous User

Original User: matthiasbuehler

1] and 3]

basically you write a recursive rule which breaks out of the loop when you have built enough floors.

start with the total number of m2 you need to build, then subtract the floor area in each floor.

the basic structure of the recursion is discussed in the video.

pseudo code :

parcel --> set parcelarea attribute
  do first setback
  Recursion ( parcelArea)

Recursion ( restArea ) -->
    case restArea < 0 : NIL
    else :
        extrude(floorHeight)
        FloorVolume
        // copy shape !
        comp(f) { top : Recursion ( restArea ) - geometry.area() }

you always take the top face of a floor volume box to go to the next floor until you're done.

you can pair this with a setback on each floor. Check the CGA forum for the 'simple recursive highrise' rule.


2]
sadly, accessing the first Edge length is not directly possible. Use scope.sx ( the shape width instead ), ok ?