topic Re: Viewshed or view dome not work for closed objects in ArcGIS CityEngine Questions

Viewshed or view dome not work for closed objects

Anonymous User — Tue, 24 Aug 2021 10:28:27 GMT

Hi, I'm new to CityEngine. I'm interesting in viewshed and view dome creation. I want to create a view dome, and look through the window with barriers to analysis the visibility outside the room, but it doesn't work well. The viewshed or view dome will not analysis the models nearby (as if in a cubic), when the view distance is 3000, the length of the cubic side is about 30.

Can you help me, please!

Re: Viewshed or view dome not work for closed objects

JonasObertuefer — Wed, 25 Aug 2021 08:45:27 GMT

Hi @Anonymous User,

Your observation is correct, this is a limitation we currently have: There is a minimal distance corresponding to the View Distance value you can set in the Inspector or using the Handles. The value of the minimal distance is approximate 1% of the View Distance. So, when your View Distance is 3000 the minimal distance will be 30 and when your View Distance is 30 your minimal distance will be 0.3.

I see one possible workaround, that could do the trick for you:

Create a Viewdome with a large View Distance
Copy&Paste the Analysis Layer in the Scene Editor to get a second Viewdome at the same location
Set the View Distance of the second Viewdome to a lower value (covering the grey area)
you should now see a combination of both Viewdomes (with some slight inaccuracy)

Best,

Jonas

Re: Viewshed or view dome not work for closed objects

Anonymous User — Wed, 22 Sep 2021 08:53:54 GMT

Thank you very much!