RigidBody2D

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 Go to latest Published: Sep 14, 2025 License: MIT Imports: 30 Imported by: 0

Documentation

Overview

graphics.gd/classdb/RigidBody2D implements full 2D physics. It cannot be controlled directly, instead, you must apply forces to it (gravity, impulses, etc.), and the physics simulation will calculate the resulting movement, rotation, react to collisions, and affect other physics bodies in its path.

The body's behavior can be adjusted via Instance.LockRotation, Instance.Freeze, and Instance.FreezeMode. By changing various properties of the object, such as Instance.Mass, you can control how the physics simulation acts on it.

A rigid body will always maintain its shape and size, even when forces are applied to it. It is useful for objects that can be interacted with in an environment, such as a tree that can be knocked over or a stack of crates that can be pushed around.

If you need to override the default physics behavior, you can write a custom force integration function. See Instance.CustomIntegrator.

Note: Changing the 2D transform or Instance.LinearVelocity of a graphics.gd/classdb/RigidBody2D very often may lead to some unpredictable behaviors. If you need to directly affect the body, prefer [Interface.IntegrateForces] as it allows you to directly access the physics state.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Advanced 

type Advanced = class

Advanced exposes a 1:1 low-level instance of the class, undocumented, for those who know what they are doing.

type Any 

type Any interface {
	gd.IsClass
	AsRigidBody2D() Instance
}

type CCDMode 

type CCDMode int //gd:RigidBody2D.CCDMode

const (
	// Continuous collision detection disabled. This is the fastest way to detect body collisions, but can miss small, fast-moving objects.
	CcdModeDisabled CCDMode = 0
	// Continuous collision detection enabled using raycasting. This is faster than shapecasting but less precise.
	CcdModeCastRay CCDMode = 1
	// Continuous collision detection enabled using shapecasting. This is the slowest CCD method and the most precise.
	CcdModeCastShape CCDMode = 2
)

type CenterOfMassMode 

type CenterOfMassMode int //gd:RigidBody2D.CenterOfMassMode

const (
	// In this mode, the body's center of mass is calculated automatically based on its shapes. This assumes that the shapes' origins are also their center of mass.
	CenterOfMassModeAuto CenterOfMassMode = 0
	// In this mode, the body's center of mass is set through [Instance.CenterOfMass]. Defaults to the body's origin position.
	CenterOfMassModeCustom CenterOfMassMode = 1
)

type DampMode 

type DampMode int //gd:RigidBody2D.DampMode

const (
	// In this mode, the body's damping value is added to any value set in areas or the default value.
	DampModeCombine DampMode = 0
	// In this mode, the body's damping value replaces any value set in areas or the default value.
	DampModeReplace DampMode = 1
)

type Expanded 

type Expanded [1]gdclass.RigidBody2D

func (Expanded) AddConstantForce 

func (self Expanded) AddConstantForce(force Vector2.XY, position Vector2.XY)

Adds a constant positioned force to the body that keeps being applied over time until cleared with constant_force = Vector2(0, 0).

'position' is the offset from the body origin in global coordinates.

func (Expanded) ApplyCentralImpulse 

func (self Expanded) ApplyCentralImpulse(impulse Vector2.XY)

Applies a directional impulse without affecting rotation.

An impulse is time-independent! Applying an impulse every frame would result in a framerate-dependent force. For this reason, it should only be used when simulating one-time impacts (use the "_force" functions otherwise).

This is equivalent to using Instance.ApplyImpulse at the body's center of mass.

func (Expanded) ApplyForce 

func (self Expanded) ApplyForce(force Vector2.XY, position Vector2.XY)

Applies a positioned force to the body. A force is time dependent and meant to be applied every physics update.

'position' is the offset from the body origin in global coordinates.

func (Expanded) ApplyImpulse 

func (self Expanded) ApplyImpulse(impulse Vector2.XY, position Vector2.XY)

Applies a positioned impulse to the body.

An impulse is time-independent! Applying an impulse every frame would result in a framerate-dependent force. For this reason, it should only be used when simulating one-time impacts (use the "_force" functions otherwise).

'position' is the offset from the body origin in global coordinates.

type Extension 

type Extension[T gdclass.Interface] struct{ gdclass.Extension[T, Instance] }

Extension can be embedded in a new struct to create an extension of this class. T should be the type that is embedding this [Extension]See Interface for methods that can be overridden by T.

func (*Extension[T]) AsCanvasItem 

func (self *Extension[T]) AsCanvasItem() CanvasItem.Instance

func (*Extension[T]) AsCollisionObject2D 

func (self *Extension[T]) AsCollisionObject2D() CollisionObject2D.Instance

func (*Extension[T]) AsNode 

func (self *Extension[T]) AsNode() Node.Instance

func (*Extension[T]) AsNode2D 

func (self *Extension[T]) AsNode2D() Node2D.Instance

func (*Extension[T]) AsObject 

func (self *Extension[T]) AsObject() [1]gd.Object

func (*Extension[T]) AsPhysicsBody2D 

func (self *Extension[T]) AsPhysicsBody2D() PhysicsBody2D.Instance

func (*Extension[T]) AsRigidBody2D 

func (self *Extension[T]) AsRigidBody2D() Instance

type FreezeMode 

type FreezeMode int //gd:RigidBody2D.FreezeMode

const (
	// Static body freeze mode (default). The body is not affected by gravity and forces. It can be only moved by user code and doesn't collide with other bodies along its path.
	FreezeModeStatic FreezeMode = 0
	// Kinematic body freeze mode. Similar to [FreezeModeStatic], but collides with other bodies along its path when moved. Useful for a frozen body that needs to be animated.
	FreezeModeKinematic FreezeMode = 1
)

type ID 

type ID Object.ID

ID is a typed object ID (reference) to an instance of this class, use it to store references to objects with unknown lifetimes, as an ID will not panic on use if the underlying object has been destroyed.

func (ID) Instance 

func (id ID) Instance() (Instance, bool)

type Implementation 

type Implementation = implementation

Implementation implements Interface with empty methods.

type Instance 

type Instance [1]gdclass.RigidBody2D

Instance of the class with convieniently typed arguments and results. 

var Nil Instance

Nil is a nil/null instance of the class. Equivalent to the zero value.

func New 

func New() Instance

func (Instance) AddConstantCentralForce 

func (self Instance) AddConstantCentralForce(force Vector2.XY)

Adds a constant directional force without affecting rotation that keeps being applied over time until cleared with constant_force = Vector2(0, 0).

This is equivalent to using Instance.AddConstantForce at the body's center of mass.

func (Instance) AddConstantForce 

func (self Instance) AddConstantForce(force Vector2.XY)

Adds a constant positioned force to the body that keeps being applied over time until cleared with constant_force = Vector2(0, 0).

'position' is the offset from the body origin in global coordinates.

func (Instance) AddConstantTorque 

func (self Instance) AddConstantTorque(torque Float.X)

Adds a constant rotational force without affecting position that keeps being applied over time until cleared with constant_torque = 0.

func (Instance) AngularDamp 

func (self Instance) AngularDamp() Float.X

func (Instance) AngularDampMode 

func (self Instance) AngularDampMode() DampMode

func (Instance) AngularVelocity 

func (self Instance) AngularVelocity() Float.X

func (Instance) ApplyCentralForce 

func (self Instance) ApplyCentralForce(force Vector2.XY)

Applies a directional force without affecting rotation. A force is time dependent and meant to be applied every physics update.

This is equivalent to using Instance.ApplyForce at the body's center of mass.

func (Instance) ApplyCentralImpulse 

func (self Instance) ApplyCentralImpulse()

Applies a directional impulse without affecting rotation.

An impulse is time-independent! Applying an impulse every frame would result in a framerate-dependent force. For this reason, it should only be used when simulating one-time impacts (use the "_force" functions otherwise).

This is equivalent to using Instance.ApplyImpulse at the body's center of mass.

func (Instance) ApplyForce 

func (self Instance) ApplyForce(force Vector2.XY)

Applies a positioned force to the body. A force is time dependent and meant to be applied every physics update.

'position' is the offset from the body origin in global coordinates.

func (Instance) ApplyImpulse 

func (self Instance) ApplyImpulse(impulse Vector2.XY)

Applies a positioned impulse to the body.

An impulse is time-independent! Applying an impulse every frame would result in a framerate-dependent force. For this reason, it should only be used when simulating one-time impacts (use the "_force" functions otherwise).

'position' is the offset from the body origin in global coordinates.

func (Instance) ApplyTorque 

func (self Instance) ApplyTorque(torque Float.X)

Applies a rotational force without affecting position. A force is time dependent and meant to be applied every physics update.

Note: Instance.Inertia is required for this to work. To have Instance.Inertia, an active graphics.gd/classdb/CollisionShape2D must be a child of the node, or you can manually set Instance.Inertia.

func (Instance) ApplyTorqueImpulse 

func (self Instance) ApplyTorqueImpulse(torque Float.X)

Applies a rotational impulse to the body without affecting the position.

An impulse is time-independent! Applying an impulse every frame would result in a framerate-dependent force. For this reason, it should only be used when simulating one-time impacts (use the "_force" functions otherwise).

Note: Instance.Inertia is required for this to work. To have Instance.Inertia, an active graphics.gd/classdb/CollisionShape2D must be a child of the node, or you can manually set Instance.Inertia.

func (Instance) AsCanvasItem 

func (self Instance) AsCanvasItem() CanvasItem.Instance

func (Instance) AsCollisionObject2D 

func (self Instance) AsCollisionObject2D() CollisionObject2D.Instance

func (Instance) AsNode 

func (self Instance) AsNode() Node.Instance

func (Instance) AsNode2D 

func (self Instance) AsNode2D() Node2D.Instance

func (Instance) AsObject 

func (self Instance) AsObject() [1]gd.Object

func (Instance) AsPhysicsBody2D 

func (self Instance) AsPhysicsBody2D() PhysicsBody2D.Instance

func (Instance) AsRigidBody2D 

func (self Instance) AsRigidBody2D() Instance

func (Instance) CanSleep 

func (self Instance) CanSleep() bool

func (Instance) CenterOfMass 

func (self Instance) CenterOfMass() Vector2.XY

func (Instance) CenterOfMassMode 

func (self Instance) CenterOfMassMode() CenterOfMassMode

func (Instance) ConstantForce 

func (self Instance) ConstantForce() Vector2.XY

func (Instance) ConstantTorque 

func (self Instance) ConstantTorque() Float.X

func (Instance) ContactMonitor 

func (self Instance) ContactMonitor() bool

func (Instance) ContinuousCd 

func (self Instance) ContinuousCd() CCDMode

func (Instance) CustomIntegrator 

func (self Instance) CustomIntegrator() bool

func (Instance) Freeze 

func (self Instance) Freeze() bool

func (Instance) FreezeMode 

func (self Instance) FreezeMode() FreezeMode

func (Instance) GetCollidingBodies 

func (self Instance) GetCollidingBodies() []Node2D.Instance

Returns a list of the bodies colliding with this one. Requires Instance.ContactMonitor to be set to true and Instance.MaxContactsReported to be set high enough to detect all the collisions.

Note: The result of this test is not immediate after moving objects. For performance, list of collisions is updated once per frame and before the physics step. Consider using signals instead.

func (Instance) GetContactCount 

func (self Instance) GetContactCount() int

Returns the number of contacts this body has with other bodies. By default, this returns 0 unless bodies are configured to monitor contacts (see Instance.ContactMonitor).

Note: To retrieve the colliding bodies, use Instance.GetCollidingBodies.

func (Instance) GravityScale 

func (self Instance) GravityScale() Float.X

func (Instance) ID 

func (self Instance) ID() ID

func (Instance) Inertia 

func (self Instance) Inertia() Float.X

func (Instance) LinearDamp 

func (self Instance) LinearDamp() Float.X

func (Instance) LinearDampMode 

func (self Instance) LinearDampMode() DampMode

func (Instance) LinearVelocity 

func (self Instance) LinearVelocity() Vector2.XY

func (Instance) LockRotation 

func (self Instance) LockRotation() bool

func (Instance) Mass 

func (self Instance) Mass() Float.X

func (Instance) MaxContactsReported 

func (self Instance) MaxContactsReported() int

func (Instance) OnBodyEntered 

func (self Instance) OnBodyEntered(cb func(body Node.Instance), flags ...Signal.Flags)

func (Instance) OnBodyExited 

func (self Instance) OnBodyExited(cb func(body Node.Instance), flags ...Signal.Flags)

func (Instance) OnBodyShapeEntered 

func (self Instance) OnBodyShapeEntered(cb func(body_rid RID.Any, body Node.Instance, body_shape_index int, local_shape_index int), flags ...Signal.Flags)

func (Instance) OnBodyShapeExited 

func (self Instance) OnBodyShapeExited(cb func(body_rid RID.Any, body Node.Instance, body_shape_index int, local_shape_index int), flags ...Signal.Flags)

func (Instance) OnSleepingStateChanged 

func (self Instance) OnSleepingStateChanged(cb func(), flags ...Signal.Flags)

func (Instance) PhysicsMaterialOverride 

func (self Instance) PhysicsMaterialOverride() PhysicsMaterial.Instance

func (Instance) SetAngularDamp 

func (self Instance) SetAngularDamp(value Float.X)

func (Instance) SetAngularDampMode 

func (self Instance) SetAngularDampMode(value DampMode)

func (Instance) SetAngularVelocity 

func (self Instance) SetAngularVelocity(value Float.X)

func (Instance) SetAxisVelocity 

func (self Instance) SetAxisVelocity(axis_velocity Vector2.XY)

Sets the body's velocity on the given axis. The velocity in the given vector axis will be set as the given vector length. This is useful for jumping behavior.

func (Instance) SetCanSleep 

func (self Instance) SetCanSleep(value bool)

func (Instance) SetCenterOfMass 

func (self Instance) SetCenterOfMass(value Vector2.XY)

func (Instance) SetCenterOfMassMode 

func (self Instance) SetCenterOfMassMode(value CenterOfMassMode)

func (Instance) SetConstantForce 

func (self Instance) SetConstantForce(value Vector2.XY)

func (Instance) SetConstantTorque 

func (self Instance) SetConstantTorque(value Float.X)

func (Instance) SetContactMonitor 

func (self Instance) SetContactMonitor(value bool)

func (Instance) SetContinuousCd 

func (self Instance) SetContinuousCd(value CCDMode)

func (Instance) SetCustomIntegrator 

func (self Instance) SetCustomIntegrator(value bool)

func (Instance) SetFreeze 

func (self Instance) SetFreeze(value bool)

func (Instance) SetFreezeMode 

func (self Instance) SetFreezeMode(value FreezeMode)

func (Instance) SetGravityScale 

func (self Instance) SetGravityScale(value Float.X)

func (Instance) SetInertia 

func (self Instance) SetInertia(value Float.X)

func (Instance) SetLinearDamp 

func (self Instance) SetLinearDamp(value Float.X)

func (Instance) SetLinearDampMode 

func (self Instance) SetLinearDampMode(value DampMode)

func (Instance) SetLinearVelocity 

func (self Instance) SetLinearVelocity(value Vector2.XY)

func (Instance) SetLockRotation 

func (self Instance) SetLockRotation(value bool)

func (Instance) SetMass 

func (self Instance) SetMass(value Float.X)

func (Instance) SetMaxContactsReported 

func (self Instance) SetMaxContactsReported(value int)

func (*Instance) SetObject 

func (self *Instance) SetObject(obj [1]gd.Object) bool

func (Instance) SetPhysicsMaterialOverride 

func (self Instance) SetPhysicsMaterialOverride(value PhysicsMaterial.Instance)

func (Instance) SetSleeping 

func (self Instance) SetSleeping(value bool)

func (Instance) Sleeping 

func (self Instance) Sleeping() bool

func (Instance) Virtual 

func (self Instance) Virtual(name string) reflect.Value

type Interface 

type Interface interface {
	// Called during physics processing, allowing you to read and safely modify the simulation state for the object. By default, it is called before the standard force integration, but the [Instance.CustomIntegrator] property allows you to disable the standard force integration and do fully custom force integration for a body.
	IntegrateForces(state PhysicsDirectBodyState2D.Instance)
}

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