Is PreciseConvexDecomposition CollisionFidelity really that bad for performance?

[SwitchedDreams]

The title basically says it all,

Is using this CollisionFidelity really that bad for performance when using it sparingly?

[BullfrogBait]

I think using it sparingly is fine. It depends on how complex your mesh is.

I don’t really think there’s a lot of appropriate use cases for using that fidelity option besides large mesh terrain or something similar. You don’t need your meshes to have extremely accurate collision unless the collision errors are quite noticeable.

[Sterling_ODeaghaidh]

To put it plainly here is the answer: It Depends

ColissionFidelity is the setting that roblox uses to calculate the collision box for the object. PreciseConvexDecomposition is basically the “High Resolution” option, thus it will take more data to load as opposed to Box or Hull. Box is what you should be using on stuff that isn’t interacted with and use the Hull for moderate stuff with Precise for things the player will interact with most of the time.

[SwitchedDreams]

So hull is basically the more dumbed down version of PreciseConvex?

[XenoDenissboss1]

Almost, you could probably say its like the Box collision fidelity but instead of a box it just uses a general whole shape of the mesh youre working with

[Sterling_ODeaghaidh]

Hull and Precise calculate physics interaction by the mesh’s shape, Hull is the middle ground where box doesn’t calculate the shape at all and just does a well … box … Precise on the other hand calculates the shapes triangles and adds a collision box that conforms to the mesh so that the mesh’s shape actually interacts like a real object would IRL.