Creating one clean surface from multiple overlapping surfaces!

[byee.lau]

Hi, I am trying to create several overlapping plane surfaces from plane curves, and would like to join them into one clean surface so that I can extrude them later.

My problem is trying to join the surfaces. I have tried:

[surfaces] -> [solidunion] -> [mergefaces]
and
[surfaces] -> [brepjoin],

however it still does not work. Could someone please give me advice?!
image and grasshopper file attached.

planar surfaces.gh (15.2 KB)

[tim.stark]

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[byee.lau]

planar surfaces.gh (15.2 KB)

Hope this helps clarify my problem.

[anikolo (Aris)]

If you are starting out with curves, I think I had a similar question to yours and @HS_Kim found me the solution:

Region Union Fail: It's always the donut!

Hi, This is a problem I hit upon again and again… When you want to create a Region union, you always have a problem with the ‘donuts’. whenever a region has a hole in it, it confuses the whole operation. I simplified the example bellow with just a rectangle and a donut. The only solution I have found is to create a union with all the ‘external’ boundaries and then subtract the ‘internal’ ones. The problem is that when you have a bunch of them, It becomes exponentially complicated. For examp…