topic Re: webscene and transparency in ArcGIS CityEngine Questions

webscene and transparency

johnbrosowsky — Thu, 08 May 2014 10:24:02 GMT

In my city engine scene I make rooftops transparent in order to see into the buildings from the top. When I export to a web scene, the rooftops in web viewer are solid. How can I make the web scene observe the transparency?

Re: webscene and transparency

LukeCzar — Thu, 08 May 2014 11:17:23 GMT

Hi John,

How did you make them transparent? is it a sketchup model? did you use RULES to make those building transparent?

Lukasz

Re: webscene and transparency

johnbrosowsky — Thu, 08 May 2014 14:44:35 GMT

I imported a shapefile containing building footprints, and then used a simple rules cga to extrude the building footprint polygons, and assign color and opacity to floor, roof, and walls:

attr Height = 10

@StartRule

Lot--> extrude (Height)

comp(f){side: Facade | bottom: Floor | top: Roof}

Roof -->
set(material.color.a, 0)
color("#CDB38B")

Facade -->
color("#909090")

Floor -->
color("#F7F8E0")

Re: webscene and transparency

MatthiasBuehler1 — Fri, 09 May 2014 07:24:22 GMT

try :

set(material.opacity, 0.3)

matt

Re: webscene and transparency

johnbrosowsky — Mon, 12 May 2014 16:27:05 GMT

It still does not work. I see the partial opacity in the City Engine desktop, but in exported web scenes or collada models.

Re: webscene and transparency

MatthiasBuehler1 — Wed, 14 May 2014 11:45:30 GMT

can you post some precise screenshots of what needs to be transparent and how it looks both in CE and in the WebScene ?

are textures involved that need to be transparent ?

let me know ..

matt

Re: webscene and transparency

johnbrosowsky — Wed, 14 May 2014 15:44:19 GMT

There are no textures. I imported a shapefile of building footprints, extruded into 3D, and set the top to be transparent using the simple CGA rule I pasted above. Attached are pictures. The .cej shows a transparent roof. When I export to 3ws or collada the roof becomes solid.

Re: webscene and transparency

MatthiasBuehler1 — Sat, 11 Dec 2021 07:54:52 GMT

Hi,

sorry for the trouble...

can you please try 1 single rectangular shape with this code:

Shape -->
      extrude(5)
      set(material.opacity, 0.5)

this should work in any case. it works for me here.

let me know ..

matt

Re: webscene and transparency

johnbrosowsky — Fri, 16 May 2014 20:20:48 GMT

That works! Is it possible to get the polygons extruded from the imported shapefile to look the same?

Thanks a lot!

Re: webscene and transparency

MatthiasBuehler1 — Mon, 19 May 2014 11:59:24 GMT

Sure .. that should work.

So it seems something goes wrong with your CGA code ..

Just copy-paste my code into your code and this should work then.

Maybe start a fresh rule with this as a base. ok ?

Matt