# Physics > Global physics properties and helper methods. ## Definition * **Type:** Class * **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md) * **Assembly:** UnityEngine.PhysicsModule ```csharp public class Physics ``` ## Static Fields | Value | Description | | --------------------------------------------------------------------------------------------------- | ----------------------------------------------------- | | [AllLayers](/engine/6000.7/script-reference/unityengine/physics/alllayers.md) | Layer mask constant to select all layers. | | [DefaultRaycastLayers](/engine/6000.7/script-reference/unityengine/physics/defaultraycastlayers.md) | Layer mask constant to select default raycast layers. | | [IgnoreRaycastLayer](/engine/6000.7/script-reference/unityengine/physics/ignoreraycastlayer.md) | Layer mask constant to select ignore raycast layer. | ## Static Properties | Property | Description | | ------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- | | [bounceThreshold](/engine/6000.7/script-reference/unityengine/physics/bouncethreshold.md) | Two colliding objects with a relative velocity below this will not bounce (default 2). Must be positive. | | [clothGravity](/engine/6000.7/script-reference/unityengine/physics/clothgravity.md) | Cloth Gravity setting. Set gravity for all cloth components. | | [defaultContactOffset](/engine/6000.7/script-reference/unityengine/physics/defaultcontactoffset.md) | The default contact offset of the newly created colliders. | | [defaultMaxAngularSpeed](/engine/6000.7/script-reference/unityengine/physics/defaultmaxangularspeed.md) | Default maximum angular speed of the dynamic Rigidbody, in radians (default 50). | | [defaultMaxDepenetrationVelocity](/engine/6000.7/script-reference/unityengine/physics/defaultmaxdepenetrationvelocity.md) | The maximum default velocity needed to move a Rigidbody's collider out of another collider's surface penetration. Must be positive. | | [defaultPhysicsScene](/engine/6000.7/script-reference/unityengine/physics/defaultphysicsscene.md) | The [PhysicsScene](/engine/6000.7/script-reference/unityengine/physicsscene.md) automatically created when Unity starts. | | [defaultSolverIterations](/engine/6000.7/script-reference/unityengine/physics/defaultsolveriterations.md) | The defaultSolverIterations determines how accurately Rigidbody joints and collision contacts are resolved. (default 6). Must be positive. | | [defaultSolverVelocityIterations](/engine/6000.7/script-reference/unityengine/physics/defaultsolvervelocityiterations.md) | The defaultSolverVelocityIterations affects how accurately the Rigidbody joints and collision contacts are resolved. (default 1). Must be positive. | | [generateOnTriggerStayEvents](/engine/6000.7/script-reference/unityengine/physics/generateontriggerstayevents.md) | Whether the physics system sends `OnTriggerStay` events. | | [gravity](/engine/6000.7/script-reference/unityengine/physics/gravity.md) | The gravity applied to all rigid bodies in the Scene. | | [improvedPatchFriction](/engine/6000.7/script-reference/unityengine/physics/improvedpatchfriction.md) | Enables an improved patch friction mode that guarantees static and dynamic friction do not exceed analytical results. | | [interCollisionDistance](/engine/6000.7/script-reference/unityengine/physics/intercollisiondistance.md) | Sets the minimum separation distance for cloth inter-collision. | | [interCollisionStiffness](/engine/6000.7/script-reference/unityengine/physics/intercollisionstiffness.md) | Sets the cloth inter-collision stiffness. | | [invokeCollisionCallbacks](/engine/6000.7/script-reference/unityengine/physics/invokecollisioncallbacks.md) | Whether or not [MonoBehaviour](/engine/6000.7/script-reference/unityengine/monobehaviour.md) collision messages will be sent by the physics system. | | [queriesHitBackfaces](/engine/6000.7/script-reference/unityengine/physics/querieshitbackfaces.md) | Whether physics queries should hit back-face triangles. | | [queriesHitTriggers](/engine/6000.7/script-reference/unityengine/physics/querieshittriggers.md) | Specifies whether queries (raycasts, spherecasts, overlap tests, etc.) hit Triggers by default. | | [reuseCollisionCallbacks](/engine/6000.7/script-reference/unityengine/physics/reusecollisioncallbacks.md) | Determines whether the garbage collector should reuse only a single instance of a Collision type for all collision callbacks. | | [simulationMode](/engine/6000.7/script-reference/unityengine/physics/simulationmode.md) | Controls when Unity executes the physics simulation. | | [sleepThreshold](/engine/6000.7/script-reference/unityengine/physics/sleepthreshold.md) | The mass-normalized energy threshold, below which objects start going to sleep. | ## Static Methods | Method | Description | | ----------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [BakeMesh](/engine/6000.7/script-reference/unityengine/physics/bakemesh.md) | Prepares the mesh for use with a [MeshCollider](/engine/6000.7/script-reference/unityengine/meshcollider.md) and uses default cooking options. | | [BoxCast](/engine/6000.7/script-reference/unityengine/physics/boxcast.md) | Casts the box along a ray and returns detailed information on what was hit. | | [BoxCastAll](/engine/6000.7/script-reference/unityengine/physics/boxcastall.md) | Like [Physics.BoxCast](/engine/6000.7/script-reference/unityengine/physics/boxcast.md), but returns all hits. | | [BoxCastNonAlloc](/engine/6000.7/script-reference/unityengine/physics/boxcastnonalloc.md) | Cast the box along the direction, and store hits in the provided buffer. | | [CapsuleCast](/engine/6000.7/script-reference/unityengine/physics/capsulecast.md) | Casts a capsule against all colliders in the Scene and returns detailed information on what was hit. | | [CapsuleCastAll](/engine/6000.7/script-reference/unityengine/physics/capsulecastall.md) | Like [Physics.CapsuleCast](/engine/6000.7/script-reference/unityengine/physics/capsulecast.md), but this function will return all hits the capsule sweep intersects. | | [CapsuleCastNonAlloc](/engine/6000.7/script-reference/unityengine/physics/capsulecastnonalloc.md) | Casts a capsule against all colliders in the Scene and returns detailed information on what was hit into the buffer. | | [CheckBox](/engine/6000.7/script-reference/unityengine/physics/checkbox.md) | Check whether the given box overlaps with other colliders or not. | | [CheckCapsule](/engine/6000.7/script-reference/unityengine/physics/checkcapsule.md) | Checks if any colliders overlap a capsule-shaped volume in world space. | | [CheckSphere](/engine/6000.7/script-reference/unityengine/physics/checksphere.md) | Returns true if there are any colliders overlapping the sphere defined by `position` and `radius` in world coordinates. | | [ClosestPoint](/engine/6000.7/script-reference/unityengine/physics/closestpoint.md) | Returns a point on the given collider that is closest to the specified location. | | [ComputePenetration](/engine/6000.7/script-reference/unityengine/physics/computepenetration.md) | Compute the minimal translation required to separate the given colliders apart at specified poses. | | [GetIgnoreCollision](/engine/6000.7/script-reference/unityengine/physics/getignorecollision.md) | Checks whether the collision detection system will ignore all collisions/triggers between `collider1` and `collider2` or not. | | [GetIgnoreLayerCollision](/engine/6000.7/script-reference/unityengine/physics/getignorelayercollision.md) | Are collisions between `layer1` and `layer2` being ignored? | | [IgnoreCollision](/engine/6000.7/script-reference/unityengine/physics/ignorecollision.md) | Makes the collision detection system ignore all collisions between `collider1` and `collider2`. | | [IgnoreLayerCollision](/engine/6000.7/script-reference/unityengine/physics/ignorelayercollision.md) | Makes the collision detection system ignore all collisions between any collider in layer1 and any collider in layer2. | | [Linecast](/engine/6000.7/script-reference/unityengine/physics/linecast.md) | Returns true if there is any collider intersecting the line between `start` and `end`. | | [OverlapBox](/engine/6000.7/script-reference/unityengine/physics/overlapbox.md) | Find all colliders touching or inside of the given box. | | [OverlapBoxNonAlloc](/engine/6000.7/script-reference/unityengine/physics/overlapboxnonalloc.md) | Find all colliders touching or inside of the given box, and store them into the buffer. | | [OverlapCapsule](/engine/6000.7/script-reference/unityengine/physics/overlapcapsule.md) | Check the given capsule against the physics world and return all overlapping colliders. | | [OverlapCapsuleNonAlloc](/engine/6000.7/script-reference/unityengine/physics/overlapcapsulenonalloc.md) | Check the given capsule against the physics world and return all overlapping colliders in the user-provided buffer. | | [OverlapSphere](/engine/6000.7/script-reference/unityengine/physics/overlapsphere.md) | Computes and stores colliders touching or inside the sphere. | | [OverlapSphereNonAlloc](/engine/6000.7/script-reference/unityengine/physics/overlapspherenonalloc.md) | Computes and stores colliders touching or inside the sphere into the provided buffer. | | [Raycast](/engine/6000.7/script-reference/unityengine/physics/raycast.md) | Same as above using /ray.origin/ and /ray.direction/ instead of `origin` and `direction`. | | [RaycastAll](/engine/6000.7/script-reference/unityengine/physics/raycastall.md) | Casts a ray through the Scene and returns all hits. Note that order of the results is undefined. | | [RaycastNonAlloc](/engine/6000.7/script-reference/unityengine/physics/raycastnonalloc.md) | Cast a ray through the Scene and store the hits into the buffer. | | [RebuildBroadphaseRegions](/engine/6000.7/script-reference/unityengine/physics/rebuildbroadphaseregions.md) | Rebuild the broadphase interest regions as well as set the world boundaries. | | [Simulate](/engine/6000.7/script-reference/unityengine/physics/simulate.md) | Simulate physics in the Scene. | | [SphereCast](/engine/6000.7/script-reference/unityengine/physics/spherecast.md) | Casts a sphere along a ray and returns detailed information on what was hit. | | [SphereCastAll](/engine/6000.7/script-reference/unityengine/physics/spherecastall.md) | Like [Physics.SphereCast](/engine/6000.7/script-reference/unityengine/physics/spherecast.md), but this function will return all hits the sphere sweep intersects. | | [SphereCastNonAlloc](/engine/6000.7/script-reference/unityengine/physics/spherecastnonalloc.md) | Cast sphere along the direction and store the results into buffer. | | [SyncTransforms](/engine/6000.7/script-reference/unityengine/physics/synctransforms.md) | Apply Transform changes to the physics engine. | ## Static Events | Member | Description | | ----------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------ | | [ContactEvent](/engine/6000.7/script-reference/unityengine/physics/contactevent.md) | Subscribe to this event to read all collisions that occurred during the physics simulation step. | | [ContactModifyEvent](/engine/6000.7/script-reference/unityengine/physics/contactmodifyevent.md) | Subscribe to this event to be able to customize the collision response for contact pairs. | | [ContactModifyEventCCD](/engine/6000.7/script-reference/unityengine/physics/contactmodifyeventccd.md) | Subscribe to this event to be able to customize the collision response of CCD generated contact pairs. |