City Engine: Trim Object at Border of other Shape

[JonasWeiter]

Hello,

I have got a Problem and don't know how to solve this.

I have two overlaying shapes representing the outline of a building and the outline of the property(Pic.1).

Starting from the first edge of the building I want to create s.th like a roof ranging to the outline of the property(Pic.2).

(Pic. 1)

(Pic. 2)

However I am not able to trim the yellow plane at the edge of the shape.

I tried to use the functions overlaps(), inside(), and touches() and trim() but it doesn't work.

Btw I am using Version 2014.1 and my code looks like this:

version "2014.1"

const height= rand(5,8)

const length=50

Lot-->

    comp(f){0:rest|1:Lot1 Lot2}

rest-->

    color(50,50,50)

    extrude(-.1)

Lot1-->

    extrude(height)

Lot2-->

    comp(e){0:firstedge}

firstedge-->

    i("builtin:cube")

    r(90,0,0)

    t(0,0,-scope.sx)

    comp(f){bottom:cubeBottom}

cubeBottom-->

    reverseNormals()

    t(0,scope.sx,0)

    s('1,-length,'1)

    test1  

test1-->

    case overlaps(inter):

        color(255,0,0)

        trim()

    else:

        color(255,255,0)

Can anyone help me with this?

I have also tried to use a multipolygon (combine Shapes), but even this doesn't work.

regards