topic Re: How do I programmatically create building footprints and assign a height attribute to the lot in CityEngine? in ArcGIS CityEngine Questions

How do I programmatically create building footprints and assign a height attribute to the lot in CityEngine?

SandeshIyer — Sun, 23 Oct 2016 00:18:37 GMT

I want to create building footprints in City Engine programmatically and specify the density of lots in a specific region and assign a height attribute for the buildings to each lot? I need to achieve all this using CGA rules and python. Can anyone point me in the right direction? I'm new to CityEngine.

Re: How do I programmatically create building footprints and assign a height attribute to the lot in CityEngine?

DanPatterson_Retired — Sun, 23 Oct 2016 00:39:34 GMT

If you are new to the software, have you seen the help topics and help files.

Help -

The rules are covered within and can be searched

Re: How do I programmatically create building footprints and assign a height attribute to the lot in CityEngine?

LR — Sat, 11 Dec 2021 08:52:10 GMT

This should help you getting started. It creates a 500x500 rectangle, gives it an attribute plus value, assigns a CGA rule and triggers model creation. Create the CGA rule ("extruder.cga") first.

Python

rect1x1 = [0,0,0, 0,0,500, 500,0,500, 500,0,0]
 shape = ce.createShape(None, rect1x1)
 ce.setAttribute(shape, 'Height', 50)
 shapeRule = "rules/extruder.cga"
 ce.setRuleFile(shape, shapeRule)
 ce.setStartRule(shape, 'Lot')
 ce.generateModels(shape, False)
 ce.waitForUIIdle()‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

CGA

attr Height = 0
@StartRule 
 Lot --> 
 extrude(Height)‍‍‍‍