Invisible Parts in Union

So basically, I was making a room that was cylindrical, and I made a door using negate. The problem is, I cannot go through the door because of an invisible block in the way. Is there a way to take it out or something? I tried changing to Inner Box on the collisions but it didn’t work so, how would I fix this problem?

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Unions are known to be incredibly finicky when it comes to collisions. They usually are not accurate when it comes to negative spaces.

There are two good solutions to this problem: you can either cut the union into smaller shapes so the hole is more accurate, or you can create a bigger hole and fill it with door frames.

This is lightly touched upon in this thread:

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