topic Re: Select - Select Objects By Map Layer in Python? in ArcGIS CityEngine Questions

Select - Select Objects By Map Layer in Python?

RobHoward — Wed, 02 Jan 2013 16:32:18 GMT

Hello,

I'd like to automate the following process in the GUI:

Select -> Select Objects By Map Layer -> Obstacle:obstacle

In my scene I have lots that are being generated over a river, despite the obstacle map being correctly applied (because certain roads that are going across the river, in the imported OSM data I'm using, cause CE to think that these are valid spots for lot creation). It's pretty easy in the GUI to select these lots and then set their shapeCreation attribute to off, but I'm trying to automate this process.

Seems like there should be a "setSelectionByMapLayer()" command 🙂

Any advice?

Thanks,
Rob

Re: Select - Select Objects By Map Layer in Python?

MatthiasBuehler1 — Thu, 03 Jan 2013 11:07:53 GMT

Hi !

You could try the following :

0] make an empty list for the stuff to select later on
1] Get all shapes in the layer
2] loop over all shapes
3] for each shape :
4] get the attribute value you have set up to select the shape via the GUI ( the boolean )
5] if attr == True : selectionList.append(shape)
6] after loop : select your list content.

Makes sense ?

Let me know ..

Matt

Re: Select - Select Objects By Map Layer in Python?

MatthiasBuehler1 — Thu, 03 Jan 2013 11:10:22 GMT

Here's a similar script to check out ..

Re: Select - Select Objects By Map Layer in Python?

RobHoward — Fri, 04 Jan 2013 19:25:30 GMT

Thanks, yes, that was helpful information!

I ended up using a somewhat different implementation but you helped get me going
on the right track:

def SelectAllBlocksInObstacleMap():
    ''' turn off blocks if vertices are in obstacle map defined areas '''

    Obstacle = ce.getObjectsFrom(ce.scene, ce.isLayer, ce.withName("'Obstacle'"))[0]

    allBlocks = ce.getObjectsFrom(ce.scene, ce.isBlock)

    for o in allBlocks:

        verts = ce.getVertices(o)
        if verts:
            x = verts[0]
            z = verts[2]
            sampleSpot = ce.sampleBooleanLayerAttribute(Obstacle, "obstacle", x, z)

            if sampleSpot:
                ce.setAttribute(o, '/ce/block/shapeCreation', False)

as you can see, what I was missing was knowing to use the sampleBooleanLayerAttribute command,
so once I figured that out, I was able to proceed- although your implementation seems a bit cleaner, so I might
give that a try as well. 🙂

Re: Select - Select Objects By Map Layer in Python?

MatthiasBuehler1 — Tue, 08 Jan 2013 00:15:33 GMT

Glad you found a way.

There's usually multiple ways to do things .. 😮