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Region Union Fail: It's always the donut!

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@anikolo wrote:

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 example: how would you go about unifying the selected curves in the image? Any plugins/ methods?

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