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1. Python console
In Window - Show Console, select a new Python console in the console that appears on the right:
This opens a new Python command window
Enter the following command:
ce.setSelection(ce.getObjectsFrom(ce.scene, ce.withName(\"*Broadway*\")))
This command selects elements in the scene that contain Broadway in their names
2. Python editor
Using the Python editor is helpful when planning to use more advanced Python commands.
(1) Select File—New...—Python Module
(2) In the Python module wizard, select the folder location where the Python script is stored
(3) Name the python script to be created, here named myHelper
(4) Select a template, here the Main function template is used as an example.
(5) Click Finish to complete the creation.
After creation, a Python editor window is opened in the window.
(6) Create a new selectByAttribute(attr,value) function in the editor:
def selectByAttribute(attr, value):
objects = ce.getObjectsFrom(ce.scene)
selection = []
for o in objects:
attrvalue = ce.getAttribute(o, attr)
if attrvalue == value:
selection.append(o)
ce.setSelection(selection)
Then call the function in the main function:
if __name__ == '__main__':
selectByAttribute(\"connectionStart\",\"JUNCTION\")
(The meaning of the above code is to select all elements whose value is JUNCTION in the connectionStart attribute in the scene)
After writing the code, click Save, and then press F9 to run this code,
You can also specify the path of the script in the Python console, import the script, and then call the myHelper you just wrote in the console, and fill in the required parameters. The command is as follows:
>>> sys.path.append(ce.toFSPath(\"scripts\"))
>>> import myHelper
>>> myHelpers.selectByAttribute(\"connectionEnd\", \"CROSSING\")
At this time, the element whose value is CROSSING in the connectionEnd attribute is selected.
*Add a startup script
Create a new startup.py script in the CityEngine workspace, and add the following statement to this script so that the myHelper script you just wrote can be loaded when CityEngine starts.
import sys
sys.path.append({PATH_TO_YOUR_SCRIPTS_DIRECTORY})
# eg sys.path.append(\"C:\\user\\CityEngine\\MyProject\\scripts\\")
import myHelper
The next time CityEngine starts, myHelper will be loaded automatically, and the selection function can be used in the Python console in the following way:
>>> startup.myHelpers.selectByAttribute(\"connectionEnd\", \"JUNCTION\")
startup.py will only be loaded when CityEngine starts, so after modifying this script, you need to restart CityEngine.
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