Invisable Part Glitch in Meshes

So every time I would import a tunnel system I made into blender, so basically a hallow cylinder, there would be and invisible part in it, now this part spawned randomly every time I imported it, there were some times where I could not go in, some where the floor was a stud off the ground and more where there was an invisible barrier halting my progression to the end of the tunnel. Here is a list of stuff I did:

Remade it
Imported it into a meshpart
Shut off studio and blender and turned it back on
Used a different object like a block instead, or a circle.

If you have any Idea on how to fix it I would really appreciate it.

That’s the mesh’s collision geometry. Things like tunnels and concave objects don’t have great collision maps, and it’s typically better to either make it out of Parts (and using meshes for detail), or to cut up your mesh into smaller pieces (however this is usually bad practice).

There’s lots of other posts on the forums about this, search for them and read up :slight_smile:

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Thank you, I have been irritated by that for so long and only just became a member to post about it.