topic Re: Creating Streets from existing 3d polyline data in ArcGIS CityEngine Questions

Creating Streets from existing 3d polyline data

DaveMansergh — Fri, 13 May 2016 02:10:30 GMT

When importing 3d polylines into City Engine from ArcGIS 10.4, how do you retain the 3d geometry of the polyline so that when a shape creation rule (such as simple streets) is applied, the road follows its original design curves (vertical and horizontal) - as defined in the original GIS layer. When I import a 3d polyline, the vertical curves/alignment reset to the ground plane (y=0). I am trying to import 3d centrelines of road from ArcGIS in order to generate roads from the original design (as opposed to aligning with a terrain surface). Align to terrain is set to off in the create new street settings. Any suggestions?

Difficult to show clearly but the attached images show the 3d alignment screenshot from ArcScene and the flattened version screenshot from CE from the same relative position (not the CE JPG has no elevation).

Re: Creating Streets from existing 3d polyline data

JawadhHabeeb1 — Sun, 15 May 2016 14:14:19 GMT

Try this : when Importing the polylines to CityEngine Scene, make sure the Run Generate Bridges Tool is checked.

Re: Creating Streets from existing 3d polyline data

DaveMansergh — Tue, 17 May 2016 06:29:32 GMT

Hi Jawadh

Thanks for the response. That did not work, but gave me a few ideas to try. Import 3d polyline seems to work if Generate Bridges is “off” and if imported from a geodatabase (rather than a shape file). If Generate Bridges is “on”, I get some very strange results.

Dave

Re: Creating Streets from existing 3d polyline data

ThomasFuchs — Mon, 23 May 2016 19:14:54 GMT

Hi Dave

The "Generate Bridges" option sets the height depended on the attribute 'height' (if present).

This is mainly thought to be used with 2D data that has some segments (like bridges) with height information.

Maybe this is the cause of your strange results?

Re: Creating Streets from existing 3d polyline data

DaveMansergh — Tue, 24 May 2016 04:36:41 GMT

Thanks Thomas

That is useful to know. I have a workaround for my immediate problem but am still trying to understand the cause of the issue.

Regards

Dave