Roblox adds per-mesh collision tuning in Studio
A new precision slider and collision overlays give builders finer control. Existing assets change only when you opt in.
Roblox has added a Tunable option for mesh collision geometry, giving builders more control over how closely an asset’s physical shape matches its visible surface. The 17 September announcement introduces a CollisionPrecision slider when a MeshPart’s CollisionFidelity is set to Tunable. Existing meshes keep their current behavior until someone changes their settings.
What builders can adjust
The initial precision depends on mesh size, so Roblox recommends getting an asset close to its intended dimensions before switching. Resizing afterward does not currently recalculate its collision geometry automatically.
Studio’s visualization tools also combine visible and collision meshes with adjustable transparency. Filters cover CanCollide, CanQuery, CanTouch and collision groups. These controls are available through Visualization Modes in the viewport.
There are practical limits. Computing precision levels for a complex mesh can initially take up to five seconds, and bulk changes can pause Studio. Roblox also reports problems with some detailed or intersecting meshes and incorrect collision previews for avatars. See the announcement’s limitations before changing a large set of assets.
Try one troublesome asset first
Our recommendation is to start with a mesh where players already encounter a reproducible collision problem. Record the current behavior, then compare several precision settings at the asset’s intended size. Use the overlay to inspect the shape and repeat the same movement or interaction test after each change.
Choose the least complex setting that handles the interaction your game needs. A more detailed collision shape is not automatically the best choice for every prop. Test gameplay behavior and performance before applying the setting across a map, especially where many copies of the same asset appear together.