Area of element intersection

Hi,
I’m attempting to create a script that would calculate formwork for a bridge span. The script works fine, as far as I have tested, but there is a spot where the span connects to 3 columns. On this surface between them, there is no need for formwork, as such, I would like to exclude this surface from the formwork quantity, but can’t figure out how to find the value of this area.
The picture below shows how it all looks in Dynamo - red represents the surfaces that need formwork.

@alvis.narmonts ,

i think thats the way!


KR
Andreas

Thanks for the reply Andreas!
Your suggestions works, but I found that in situations where the surface is double sloped there appears an error when joining the curves.
This is how the situation looks in the model:


An this is the error in Dynamo:

I will mark your reply as the solution. For this error i will just have to figure what to do.

@alvis.narmonts ,

i think it is Listlevel …

you can level your list also in the node Curve.Join…

the aim is to make with the lines a polycurve → surface.Batch - > x.Area

KR

Andreas

will check. Thanks again.