topic Re: create bookmark from viewshed (python script) in ArcGIS CityEngine Questions

create bookmark from viewshed (python script)

desert — Wed, 28 Aug 2024 06:23:10 GMT

Hello,

I found it tedious to manually create bookmarks at the same location as the viewshed, so I tried using a Python script for the task.

Although I'm not very familiar with Python, I was able to confirm that the result is correct.(This work was assisted by ChatGPT. I would like to express my gratitude for the exceptional capabilities of ChatGPT. :))

from scripting import * # Get a CityEngine instance ce = CE() # Function to add cameras and create bookmarks based on multiple Viewshed analyses def addCamerasAndBookmarksForViewsheds(): # Get all objects in the scene all_objects = ce.getObjectsFrom(ce.scene) # Filter out the viewshed objects viewsheds = [obj for obj in all_objects if ce.isViewshed(obj)] if not viewsheds: print("No viewshed analyses found in the scene.") return # Get the 3D view viewport = ce.get3DViews() # Iterate over each viewshed and create a camera and a bookmark for i, viewshed in enumerate(viewsheds): # Extract relevant viewshed information observer_position = ce.getObserverPoint(viewshed) angles = ce.getTiltAndHeadingAngles(viewshed) #The heading angle of the bookmark needs to be multiplied by -1 #relative to the heading angle of the viewshed. I'm not sure if this #is due to an issue with the coordinate system. tilt, heading = angles[0], angles[1] * -1 # Set the camera details to match the viewshed direction and angle viewport.setCameraPosition(observer_position[0], observer_position[1], observer_position[2]) viewport.setCameraRotation(tilt, heading, 0) # Corrected: tilt, heading, roll # You can change the AOV viewport.setCameraAngleOfView(39.6) # Create a bookmark with the given name bookmark_name = "Bookmark_{}".format(ce.getName(viewshed)) viewport.addBookmark(bookmark_name) print("Bookmark '{}' created for viewshed '{}'.".format(bookmark_name, ce.getName(viewshed))) # Main script execution if __name__ == '__main__': addCamerasAndBookmarksForViewsheds()

(view in My Videos)

It's not best, but I hope it helps in some way

Re: create bookmark from viewshed (python script)

shiunwo1 — Wed, 28 Aug 2024 10:39:39 GMT

I have a hard time believing that this was ever an intended feature. What probably happened is someone finally saw this, went "That looks like a security problem", and patched it.

Re: create bookmark from viewshed (python script)

desert — Fri, 30 Aug 2024 03:42:03 GMT

I wish there was a function to convert a viewshed into a bookmark.

Re: create bookmark from viewshed (python script)

JonasObertuefer — Wed, 11 Sep 2024 08:17:21 GMT

Hi @desert,

Interesting script, thanks for sharing. To make it work in CityEngine I had to change a couple of lines at the start:

# Filter out the viewshed objects viewsheds = ce.getObjectsFrom(ce.scene, ce.isViewshed) if not viewsheds: print("No viewshed analyses found in the scene.") return # Get the 3D view viewport = ce.get3DViews()[0]

If I understand it correctly what you really would like to see is a way to create and edit bookmarks similar to how you can with Viewsheds. If this is the case I encourage you to express this as a new idea in the Ideas forum, this way it will get more traction 🙂

Cheers
Jonas