Is it not possible to achieve the same collisions as the default sphere with a mesh sphere?

Do the default Roblox spheres have perfect collisions that can’t be replicated with a mesh? I wanted to be able to change the shape of the sphere to something else with ease, and though just changing a mesh ID would be a good idea. But after some testing, I have found that even if you export and re-import the default sphere, the collisions are not the same.

Is it even possible?

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i would be inclined to say that doing this isn’t a good idea - the collision models that the engine generates for user-generated meshes are not (and are not intended to be) polygon-perfect.

that being said, my partner has a low-poly sphere with good collisions when CollisionFidelity is set to Hull here. This may be possible to do with other sphere meshes; I’m not quite sure. I have a hunch that it should, because a sphere should be 100% convex… at any rate, I know that it seems to be acceptable with this one

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You could just disable CanCollide for your mesh and weld a Roblox sphere to it to get the results you’re looking for

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Try to separate the sphere into 2 parts and import it that way. Make sure Collision Fidelity is set to Default. They recently updated the collision fidelity calculations and you should not have any problems.