Boolean Difference Failed / Split Failed

Rhino Rhino for Windows
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I’m trying to subtract the piping from the building’s surface. Some work, while others don’t. Not sure the reasoning for this?

I have attempted to use both Boolean difference and the split tool both have failed.

For context: The building surface was created using grasshopper. I then converted to Mesh < OffesetMesh < MeshtoNURB

(File upload isn’t working for some reason)

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Hi 1606739 -
To troubleshoot a Boolean operation, run the Intersect command on both objects and closely inspect the resulting intersection curve(s). They need to be either closed or end on an edge of the surfaces.

If the file is too big, just export two objects that you are having problems with and upload that.
-wim

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