CityEngine Python Scripting: Batch grow streets and export as shape file

StephenCondors — Fri, 11 Jul 2014 01:03:57 GMT

Hi all,

I'm fairly new to CityEngine but am hoping to build a python script that will allow me to batch grow a series of street networks (with some set parameters) and export each street network to a shape file as follows:

Pseudo code:

Start a new scene

Do while i < 100

{

-growstreets(with some parameters)

-select streets

-export streets as .shp file with name: "streets" & i & ".shp"

-select streets

-delete streets

i ++

}

I'm not new to programming but I am new to CityEngine and python.

I assume this is possible? !If anyone could point me in the direction of some suitable examples it would be much appreciated.

Many Thanks

Stephen

edit: I am playing with ce.growStreets(graph, settings) - however this function requires that I specify a graph from which streets are grown. Using the UI I can simply graph->grow streets in a blank world - can someone suggest how I do the same thing in a script (i.e. not pass a graph or pass an empty one). Thanks

edit2: OK - I am slowly moving forwards here - the following will create a new street network each time it is run, now i just need to export , delete the layer etc.

from scripting import *

# get a CityEngine instance

ce = CE()

def test():

newGraph = ce.addGraphLayer('new')

ce.growStreets(newGraph)

if __name__ == '__main__':

test()

pass

At this stage I'm unsure if a mod should delete this thread - but perhaps it will be use to someone else just starting out.

edit3: Close to a final solution - if I am doing this in a very cumbersome way please let me know

'''

Created on Jul 11, 2014

@author: Stephen

'''

from scripting import *

# get a CityEngine instance

ce = CE()

def batchGrowStreets():

for i in range(1,11😞

##Create a new graph layer

newGraph = ce.addGraphLayer('new')

##Grow streets on it

ce.growStreets(newGraph)

##Select them

graph = ce.getObjectsFrom(ce.scene)

##setup the export file

exportSettings = SHPExportGraphSettings()

exportSettings.setFilename(ce.toFSPath("testCE" + str(i) + ".shp"))

##Export graph as shape file

ce.export(graph, exportSettings)

##delete everything

ce.delete(ce.getObjectsFrom(ce.scene))

if __name__ == '__main__':

batchGrowStreets()

pass

Re: CityEngine Python Scripting: Batch grow streets and export as shape file

deleted-user-qCpyynw67wg8 — Sun, 13 Aug 2017 06:48:08 GMT

Hi,

how owe did you get on with this? I'm looking at getting roads generated from city engine into Infraworks and this would be really useful

thanks

Neil

Re: CityEngine Python Scripting: Batch grow streets and export as shape file

ThomasFuchs — Tue, 15 Aug 2017 15:24:31 GMT

Hi Neil,

Thank you for your question.

CityEngine is a versatile software that supports export to Autodesk data formats:

Supported File-Based Data Formats | InfraWorks | Autodesk Knowledge Network

Here is a suggestion for each data type:

For exporting Graph Segments use AutoCAD DXF refer: CE Help - Exporting Graph Segments
For exporting Street Shapes also use AutoCAD DXF refer: CE Help - Exporting Shapes
For exporting Street Models generated with e.g. CE Example Complete Streets 2016 you could use Autodesk FBX refer: CE Help - Exporting Models

All these exporters can be automated with CityEngine Python CE Help - Python Scripting Category Commands .

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CityEngine Python Scripting: Batch grow streets and export as shape file

Re: CityEngine Python Scripting: Batch grow streets and export as shape file

Re: CityEngine Python Scripting: Batch grow streets and export as shape file