Unity Script Reference

Rigidbody Inherits from Component

Control of an object's position through physics simulation.

Rigidbody components take control over an object's position - it makes the objects fall down under the influence of gravity, and can calculate how objects will respond to collisions.

When manipulating rigidbody parameters you should work inside the FixedUpdate function. Physics simulation is carried out in discrete timesteps. The FixedUpdate function is called immediately before each step.

Things to watch out for when using rigid bodies:

1. If your simulation looks like slow motion and not solid:
This is a problem of scale. When your game world is huge everything will appear to be move very slowly. Make sure all your models are in real world sizes. For example a car should be around 4 meters long. A character around 2 meters high. An object falls at the same acceleration no matter big or small, heavy or light. If your game world has a large scale, objects will still fall at the same acceleration. But since everything is larger, objects will appear like they fall slower.

Variables

velocity	The velocity vector of the rigidbody.
angularVelocity	The angular velocity vector of the rigidbody.
drag	The drag of the object.
angularDrag	The angular drag of the object.
mass	The mass of the rigidbody.
useGravity	Controls whether gravity affects this rigidbody.
isKinematic	Controls whether physics affects the rigidbody.
freezeRotation	Controls whether physics will change the rotation of the object.
constraints	Controls which degrees of freedom are alowed for the simulation of this Rigidbody.
collisionDetectionMode	The Rigidbody's collision detection mode.
centerOfMass	The center of mass relative to the transform's origin.
worldCenterOfMass	The center of mass of the rigidbody in world space (Read Only).
inertiaTensorRotation	The rotation of the inertia tensor.
inertiaTensor	The diagonal inertia tensor of mass relative to the center of mass.
detectCollisions	Should collision detection be enabled? (By default always enabled).
useConeFriction	Force cone friction to be used for this rigidbody.
position	The position of the rigidbody.
rotation	The rotation of the rigdibody.
interpolation	Interpolation allows you to smooth out the effect of running physics at a fixed frame rate.
solverIterationCount	Allows you to override the solver iteration count per rigidbody.
sleepVelocity	The linear velocity, below which objects start going to sleep. (Default 0.14) range { 0, infinity }.
sleepAngularVelocity	The angular velocity, below which objects start going to sleep. (Default 0.14) range { 0, infinity }.
maxAngularVelocity	The maximimum angular velocity of the rigidbody. (Default 7) range { 0, infinity }.

Functions

SetDensity	Sets the mass based on the attached colliders assuming a constant density.
AddForce	Adds a force to the rigidbody. As a result the rigidbody will start moving.
AddRelativeForce	Adds a force to the rigidbody relative to its coordinate system.
AddTorque	Adds a torque to the rigidbody.
AddRelativeTorque	Adds a torque to the rigidbody relative to the rigidbodie's own coordinate system.
AddForceAtPosition	Applies force at position. As a result this will apply a torque and force on the object.
AddExplosionForce	Applies a force to the rigidbody that simulates explosion effects. The explosion force will fall off linearly with distance to the rigidbody.
ClosestPointOnBounds	The closest point to the bounding box of the attached colliders.
GetRelativePointVelocity	The velocity relative to the rigidbody at the point relativePoint.
GetPointVelocity	The velocity of the rigidbody at the point worldPoint in global space.
MovePosition	Moves the rigidbody to position.
MoveRotation	Rotates the rigidbody to rotation.
Sleep	Forces a rigidbody to sleep at least one frame.
IsSleeping	Is the rigidbody sleeping?
WakeUp	Forces a rigidbody to wake up.
SweepTest	Tests if a rigidbody would collide with anything, if it was moved through the scene.
SweepTestAll	Like Rigidbody.SweepTest, but returns all hits.

Messages Sent

OnCollisionEnter	OnCollisionEnter is called when this collider/rigidbody has begun touching another rigidbody/collider.
OnCollisionExit	OnCollisionEnter is called when this collider/rigidbody has stopped touching another rigidbody/collider.
OnCollisionStay	OnCollisionStay is called once per frame for every collider/rigidbody that is touching rigidbody/collider.

Inherited members

Inherited Variables

rigidbody	The Rigidbody attached to this GameObject (null if there is none attached).
camera	The Camera attached to this GameObject (null if there is none attached).
light	The Light attached to this GameObject (null if there is none attached).
animation	The Animation attached to this GameObject (null if there is none attached).
constantForce	The ConstantForce attached to this GameObject (null if there is none attached).
renderer	The Renderer attached to this GameObject (null if there is none attached).
audio	The AudioSource attached to this GameObject (null if there is none attached).
guiText	The GUIText attached to this GameObject (null if there is none attached).
networkView	The NetworkView attached to this GameObject (Read Only). (null if there is none attached).
guiTexture	The GUITexture attached to this GameObject (Read Only). (null if there is none attached).
collider	The Collider attached to this GameObject (null if there is none attached).
hingeJoint	The HingeJoint attached to this GameObject (null if there is none attached).
particleEmitter	The ParticleEmitter attached to this GameObject (null if there is none attached).
particleSystem	The ParticleSystem attached to this GameObject (null if there is none attached).
tag	The tag of this game object.
name	The name of the object.
hideFlags	Should the object be hidden, saved with the scene or modifiable by the user?

Inherited Functions

GetComponent	Returns the component of Type type if the game object has one attached, null if it doesn't.
GetComponentInChildren	Returns the component of Type type in the GameObject or any of its children using depth first search.
GetComponentsInChildren	Returns all components of Type type in the GameObject or any of its children.
GetComponents	Returns all components of Type type in the GameObject.
CompareTag	Is this game object tagged tag?
SendMessageUpwards	Calls the method named methodName on every MonoBehaviour in this game object and on every ancestor of the behaviour.
SendMessage	Calls the method named methodName on every MonoBehaviour in this game object.
BroadcastMessage	Calls the method named methodName on every MonoBehaviour in this game object or any of its children.
GetInstanceID	Returns the instance id of the object.
ToString	Returns the name of the game object.

Inherited Class Functions

operator bool
Instantiate	Clones the object original and returns the clone.
Destroy	Removes a gameobject, component or asset.
DestroyImmediate	Destroys the object obj immediately. It is strongly recommended to use Destroy instead.
FindObjectsOfType	Returns a list of all active loaded objects of Type type.
FindObjectOfType	Returns the first active loaded object of Type type.
operator ==	Compares if two objects refer to the same.
operator !=	Compares if two objects refer to a different object.
DontDestroyOnLoad	Makes the object target not be destroyed automatically when loading a new scene.