How would I fill a empty space?

I would like to know an idea of how I could fill this space using scripting. My main idea is to make a rain system for my game (I’m trying to avoid third party modules).

If you want to know why I am asking this question and why it is relevant to a rainfall system, it is to keep the rain off the walls or ceilings.

If you need more information, don’t hesitate to reply and ask your question.

What about creating a part that has exactly the same size, but then you :NegateAsync it?

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That’s a good idea, thank you!

Hey, I was testing what you said but looks like if I union a part, particles are still appearing in the empty space of the union.