How to cut up the roof using another geometry?

Is there a simple way of cutting up the roof following the outlines of the trusses?
Please see the green lines on the attached picture.

Not really sure what you’re asking. If all you want is that shape cut away from the roof then extrude that shape in the top view and use it to cut the roof. Else post your file.

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I managed to solve this issue somehow…but got a new problem.

I am trying to use split to make a hole on the roof. Just as object 1 in the attached picture. But when I try to do it in another place (nr 2) it says “split failed, objects may not intersect or intersections may not split object”. In place nr 2 I have already used split before and then i filled it up again. Could that have something to do with it?

Hello - please Export the cutting curve and the objects to split to a new file and post it here or send to with a link back here in your comments.


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Hi, sorry for the late reply.

Here´s the file.

Helpwithcut.3dm (240.2 KB)

Hello - UntrimHoles the bit where you have seemingly filled a hole with new surfaces-

then split .


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Hi Pascal

Thanks for the help! I can now trim the surface again at that particular spot.