topic Re: Change object attribute of a leaf shape? in ArcGIS CityEngine Questions

Change object attribute of a leaf shape?

nataliebrandenberg — Tue, 15 May 2018 05:31:15 GMT

Hello!

I'd like to change an attribute of a leaf shape (flag the attribute "window" as "yes" for window shapes).

I tried creating an object attribute (str, NULL or "no") and then filling it in with this, but without success:

Window -->
s('1,'1,0.4)
t(0,0,-0.25)
i(window_asset)
set(window, "yes")

Maybe set() is the wrong function. What would be a better way?

After that I thought of using a Python script and try to select all the leaf shapes that are windows. Can you actually select just certain leaf shapes with ce.selection? How would I do that?

Cheers

Re: Change object attribute of a leaf shape?

LR — Tue, 15 May 2018 10:03:21 GMT

Set is correct. It changes, but it won't be reflected in the Inspector. Use Inspect model under Model Hierachy (but the actual info tab is under Inspector...) and you'll see. Alternatively, print(window).

Re: Change object attribute of a leaf shape?

nataliebrandenberg — Tue, 15 May 2018 10:07:32 GMT

Thanks for your answer!

However, when I export the buildings as multipatch features (with one feature per leaf shape), the attribute change is not visible in the attribute table in ArcGIS. So that's why I'm not sure, if the attribute is even changed. The better question is maybe, why I can't see the attributes in Arcmap?

Where can I use the command print(window)?

Re: Change object attribute of a leaf shape?

DanPatterson_Retired — Tue, 15 May 2018 11:25:19 GMT

City Engine Help .... might be what you are looking for, for general guidance.

Re: Change object attribute of a leaf shape?

nataliebrandenberg — Tue, 15 May 2018 11:38:29 GMT

I did use the CityEngine help. But I did not find any details on how to make sure that all the attributes of a leaf shape are exported (other than ticking Export object attributes).

Can you point me in the right direction?

Re: Change object attribute of a leaf shape?

DanPatterson_Retired — Tue, 15 May 2018 11:49:45 GMT

I was referring to links to the 'console' to print stuff

Re: Change object attribute of a leaf shape?

nataliebrandenberg — Tue, 15 May 2018 11:52:25 GMT

Ah, I see. Thank you!

Re: Change object attribute of a leaf shape?

LR — Sun, 12 Dec 2021 00:17:42 GMT

The print command goes in the CGA. You can see the printout when you generate the model, under CGA Console. If you export to GDB you have to report your attributes. It'll write a bunch (average, etc) you most likely won't need but you can delete them again. Here's a simple example:

@StartRule 
 Lot --> 
 extrude(10)
 split(x){~0.5: A | ~0.5: B}
 
 A -->
 set(Window, "yes")
 print(Window)
 report("Window", Window)
 
 B -->
 set(Window, "nope")
 print(Window)
 report("Window", Window)‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Change object attribute of a leaf shape?

nataliebrandenberg — Wed, 16 May 2018 11:34:27 GMT

It worked. Thank you very much!