Apparently, setting a unions CollisionFidelity property to Hull doesn’t do anything but turn that object’s collision mesh into a box as seen in this place: Ambient test - Roblox the all of the walls are 1 union each with their CollisionFidelity properties set to Hull, but as you can see. You cannot walk through the doorways, or jump through the windows.
It’s a convex hull. It’s not going to allow holes inside itself because of that. Think of it as wrapping a doughnut with gift wrap. You wouldn’t wrap around the hole in the middle of the doughnut (at least I hope you wouldn’t wrap a doughnut in the first place).
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I agree with Locard. It’s like you’re wrapping a present and the wrapping paper is the collision walls.
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More visualisations:
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Would be nice if it said ConvexHull and not Hull, bit miss leading.
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