topic Re: CGA rule for slope plane/slab. ESRI house example in ArcGIS CityEngine Questions

CGA rule for slope plane/slab. ESRI house example

plfontes — Mon, 05 Jun 2023 11:59:48 GMT

Hi all,

Does anyone has the CGA code for this model (picture attached)? This screenshoot is from a old ESRI video (https://www.youtube.com/watch?v=9tYr95R6-bU&t=25s).
I am really interested to learn how to code this sloped slab that this house has. I have no idea how it was done.

Re: CGA rule for slope plane/slab. ESRI house example

JonasObertuefer — Wed, 07 Jun 2023 12:16:37 GMT

Hi @plfontes,

I hoped that I can write you back with good news but unfortunately we don't have permission to share this rule.

cheers
Jonas

Re: CGA rule for slope plane/slab. ESRI house example

CherylLau — Wed, 07 Jun 2023 12:26:43 GMT

One way to get the floorplates with the slanted part in the middle would be to split the footprint into three pieces, translate the horizontal pieces as desired, then rotate and resize the middle piece recalculating the length using trigonometry according to the desired angle.

Re: CGA rule for slope plane/slab. ESRI house example

plfontes — Wed, 07 Jun 2023 13:01:44 GMT

No worries, and I appreciate the consideration.

Re: CGA rule for slope plane/slab. ESRI house example

plfontes — Wed, 07 Jun 2023 13:02:25 GMT

Challenge accepted! 🙂
Thanks for the suggestion.

Re: CGA rule for slope plane/slab. ESRI house example

plfontes — Wed, 07 Jun 2023 14:55:25 GMT

Worked.

/** * File: slanted_slab.cga * Created: 7 Jun 2023 13:05:10 GMT * Author: PFontes */ version "2022.1" attr slabHeight = 0.3 attr higherSlabElevation = 1 attr slantedSlabWidth = 3 slantedSlabLenght = sqrt(pow( higherSlabElevation , 2) + pow( slantedSlabWidth , 2)) slantedSlabAngle = asin( higherSlabElevation / slantedSlabLenght ) @StartRule Slab --> t(0, slabHeight, 0) split(z){~1: HigherSlab | slantedSlabWidth : SlantedSlab | ~1: LowerSlab} HigherSlab --> t(0, higherSlabElevation , 0) extrude(-slabHeight) SlantedSlab --> t(0, higherSlabElevation , 0) r(slantedSlabAngle, 0, 0) s(scope.sx,1, slantedSlabLenght ) extrude(world.up, -slabHeight) LowerSlab --> extrude(-slabHeight)

Thanks @CherylLau .