topic Referencing different styles from within the same CGA file in ArcGIS CityEngine Questions

Referencing different styles from within the same CGA file

NicolaiSteinø — Wed, 30 Jan 2013 11:17:55 GMT

Is there a way to reference different styles within a cga script?

Say you want to render different facade styles (or other characteristics defined by styles) based on a constraint map reference. How do you do that?

In my case, I want to control the amount of new buildings to replace historical buildings in an urban regeneration area by means of a gray scale map indicating the redevelopment ratios for different parts of the area. I have defined old and new building types with different names within one cga file (quite a hassle and not very clean) but I would like to simplify my script (and my work) by using styles. Only, I can't figure out a way to do it.

Can you help?

Thanks,

Nicolai

Re: Referencing different styles from within the same CGA file

MatthiasBuehler1 — Sat, 11 Dec 2021 14:03:21 GMT

Hi !

Calling or referencing styles is currently not possible. If you find out how it works .. Let me know .. 🙂

So atm, you best map the 'building style' with a map and then define each attr value by a function, e.g. anything in this direction :

myValues(key) =
    case myMappedStyle == "residential" :
        case key == "height" : 6
        case key == "facade texture" : "res_1.jpg"
..

Re: Referencing different styles from within the same CGA file

NicolaiSteinø — Sun, 03 Feb 2013 10:03:40 GMT

OK, thanks.

I'm afraid maps won't do it for me, as my criteria are not necessarily geo specific. But I'll try to think of another approach then.

Styles just seem so neat�?�

Nic

Re: Referencing different styles from within the same CGA file

MatthiasBuehler1 — Sun, 03 Feb 2013 13:23:54 GMT

Note that instead of sampling from images ( maps ), you can also sample object attributes from geometries on other layers !

E.g. if you have polygonal shapes with 'zones' defined as attrs, you can define their layer mapping, then sample for those values from shapes on other layers.

Cheers !

Re: Referencing different styles from within the same CGA file

ChristianGass1 — Wed, 06 Feb 2013 22:44:20 GMT

Rather than keeping building types in a single cga file, it might be easier to split them into separate files and import the cga file for the appropriate building type into a master.cga. The imported building type cga file can be selected conditionally, based on the value from raster constraint map layer. It will keep the code a bit neater and make it more expandable (for more building types.

I'm working on a similar problem (though hadn't considered using styles); you may find the discussions in this thread informative.