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Prepare a Mesh for Mesh colliders
Wheel colliders

Mesh collider component reference

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The meshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info
See in Glossary colliderAn invisible shape that is used to handle physical collisions for an object. A collider doesn’t need to be exactly the same shape as the object’s mesh - a rough approximation is often more efficient and indistinguishable in gameplay. More info
See in Glossary takes a mesh asset and builds a collider that matches the geometry of that mesh. It’s more accurate for collisionA collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a Rigidbody component and is in motion. More info
See in Glossary detection than using primitives, and is a better option for complicated meshes.

Mesh colliders that are marked as Convex can collide with other mesh colliders.

Property Description
Convex Make the mesh collider collide with other mesh colliders. Convex mesh colliders are limited to 255 triangles.
Is Trigger Use the collider as a trigger for events. When Is Trigger is enabled, other colliders pass through this collider, and trigger the messages OnTriggerEnter, OnTriggerStay, and OnTriggerExit.
Provides Contacts Generate contact information for this collider at all times. Usually, a collider only generates contact data if there is something to send it to; in this case, the messages OnCollisionEnter, OnCollisionStay, or OnCollisionExit. When Provides Contacts is enabled, the collider generates contact data for the physics system at all times. Contact generation is resource-intensive, so Provides Contacts is disabled by default.
Cooking Options Enable or disable the mesh cooking options that affect how the physics system processes meshes. When you set the Cooking Options to any other value than the default settings (that is, everything enabled except None), the mesh collider must use a mesh that has an isReadable value of true. For details on mesh cooking, refer to Prepare a mesh for mesh colliders. Select from the following options:
  • None: Disables all Cooking Options. This is disabled by default.
  • Everything: Enables all Cooking Options. This is enabled by default.
  • Cook for Faster Simulation: The cooking process preprocesses the mesh data and stores it in memory to speed up runtime calculations. This is useful for complex meshes in the scene. When this setting is disabled, the physics system uses a faster cooking time, but retrieves the mesh data more slowly at runtime. This is enabled by default.
  • Enable Mesh Cleaning: The cooking process attempts to clear the mesh of degenerate triangles on the mesh (that is, triangles in which all three points are collinear, and do not form a triangle shape) and other geometrical artifacts. This results in a mesh that is better suited for use in collision detection, and tends to produce more accurate contact points. When this setting is disabled, the physics system uses a faster cooking time but implements less optimization. This is enabled by default.
  • Weld Colocated Vertices: The cooking process combines vertices that have the same position. This results in a mesh that is better suited for use in collision detection, and tends to produce more accurate contact points. When this setting is disabled, the physics system uses a faster cooking time but implements less optimization. This is enabled by default.
  • Use Fast Midphase: The cooking process uses the fastest mid-phase acceleration structure and algorithm available for your output platform. The fastest algorithm doesn’t require any R-Trees for spatial access. If you encounter midphase issues at runtime, disable this option; Unity then uses the slower legacy midphase algorithm instead. This is enabled by default.
Material Reference to the Physics MaterialA physics asset for adjusting the friction and bouncing effects of colliding objects. More info
See in Glossary that determines how this collider interacts with others.
Mesh Reference to the mesh to use for collisions.

Layer overrides

The Layer Overrides section provides properties that allow you to override the project-wide Layer-based collision detection settings for this collider.

Property Description
Layer Override Priority Define the priority of this collider override. When two colliders have conflicting overrides, the settings of the collider with the higher value priority are taken.
For example, if a collider with a Layer Override Priority of 1 collides with a Collider with a Layer Override Priority of 2, the physics system uses the settings for the Collider with the Layer Override Priority of 2.
Include Layers Choose which Layers to include in collisions with this collider.
Exclude Layers Choose which Layers to exclude in collisions with this collider.

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Prepare a Mesh for Mesh colliders
Wheel colliders
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