topic Re: Street Edge Detection in ArcGIS CityEngine Questions

Street Edge Detection

TomMorgan — Wed, 16 Oct 2013 05:58:57 GMT

Is there a simple way to detect the presence of an adjacent block from a street shape?

To clarify, this is distinct from finding street.front in a generated block/lot.

An example would involve instancing a different set of geometries onto street surfaces that are adjacent to lots on both sides as opposed to those that only share one edge with a generated lot.

(In this case, the orange area is NOT a generated lot...)

Re: Street Edge Detection

MatthiasBuehler1 — Wed, 16 Oct 2013 07:18:28 GMT

On the CGA side of things, I'd say occlusion queries.

But since ( and this is a crucial fact ) CGA starts operating on all shapes as they exist. CGA can not (yet) change shapes or query neighboring shapes or such --> a shapes needs to be given with a set of attributes, that's the base for CGA model generation.

--> in your case, maybe the best choice would be to write a python script to do these things or to pre-process the data within ArcGIS.

Let me know.

Matt

Re: Street Edge Detection

TomMorgan — Wed, 16 Oct 2013 08:18:44 GMT

I was dreading that.

CGA shape grammars are relatively well documented, but my experience with Python integration is not... great.

Not to mention my complete role as a naif re python.

Thanks, anyway, for the swift reply.

EDIT:

Cheap cludge, but occlusion checks on all works relatively neatly. Thanks! Red faces will be used to spawn assets....

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