Projected area calculation of surface

Revit
1

I’m trying to calculate a projected area of this sloping surface. I can’t pull the surface directly onto the plane. So I extract the curve element then pull onto the plane. After that I use PolyCurve.ByjoinedCurves but return

(Warning: PolyCurve.ByJoinedCurves operation failed.
Curve join produced more than one WIRE in PolyCurve)

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image1497×804 401 KB

2

Calculate both loops separate and subtract the inner loop from the outer loop

3

Thanks for the reply. What I’m want to achieve is to calculate the multiple surfaces like this.

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image1113×695 147 KB

So I can’t just use GetItemAtIndex to extract to loop individually. I think it should have a more efficient way.

4

GroupCurves will work here. Archilab package.

5

It works! Thank you so much.