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