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The problem is that you cannot have a surface with a hole in it. If you simply make a connection from the hole to the outside of the surface, it will make a single surface with one shared edge:

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This should apply the correct boundary conditions after matching. For example:

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The problem is that you cannot have a surface with a hole in it. it (as your roof and floor do). If you simply make a connection from the hole to the outside of the surface, it will make a single surface with one shared edge:

image description

This should apply the correct boundary conditions after matching. For example:

image description