[RigidBody3D] implements full 3D 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 [member lock_rotation], [member freeze], and [member freeze_mode]. By changing various properties of the object, such as [member 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.
[b]Note:[/b] Changing the 3D transform or [member linear_velocity] of a [RigidBody3D] very often may lead to some unpredictable behaviors. If you need to directly affect the body, prefer [method _integrate_forces] as it allows you to directly access the physics state.
Called during physics processing, allowing you to read and safely modify the simulation state for the object. By default, it works in addition to the usual physics behavior, but the [member custom_integrator] property allows you to disable the default behavior and do fully custom force integration for a body.
Adds a constant directional force without affecting rotation that keeps being applied over time until cleared with [code]constant_force = Vector3(0, 0, 0)[/code].
This is equivalent to using [method add_constant_force] at the body's center of mass.
Adds a constant rotational force without affecting position that keeps being applied over time until cleared with [code]constant_torque = Vector3(0, 0, 0)[/code].
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 [method apply_impulse] at the body's center of mass.
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).
[b]Note:[/b] [member inertia] is required for this to work. To have [member inertia], an active [CollisionShape3D] must be a child of the node, or you can manually set [member inertia].
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).
[b]Note:[/b] [member inertia] is required for this to work. To have [member inertia], an active [CollisionShape3D] must be a child of the node, or you can manually set [member inertia].
Returns a list of the bodies colliding with this one. Requires [member contact_monitor] to be set to [code]true[/code] and [member max_contacts_reported] to be set high enough to detect all the collisions.
[b]Note:[/b] 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.
Returns the number of contacts this body has with other bodies. By default, this returns 0 unless bodies are configured to monitor contacts (see [member contact_monitor]).
[b]Note:[/b] To retrieve the colliding bodies, use [method get_colliding_bodies].
Damps the body's rotation. By default, the body will use the [b]Default Angular Damp[/b] in [b]Project > Project Settings > Physics > 3d[/b] or any value override set by an [Area3D] the body is in. Depending on [member angular_damp_mode], you can set [member angular_damp] to be added to or to replace the body's damping value.
The body's custom center of mass, relative to the body's origin position, when [member center_of_mass_mode] is set to [constant CENTER_OF_MASS_MODE_CUSTOM]. This is the balanced point of the body, where applied forces only cause linear acceleration. Applying forces outside of the center of mass causes angular acceleration.
When [member center_of_mass_mode] is set to [constant CENTER_OF_MASS_MODE_AUTO] (default value), the center of mass is automatically computed.
Continuous collision detection tries to predict where a moving body will collide, instead of moving it and correcting its movement if it collided. Continuous collision detection is more precise, and misses fewer impacts by small, fast-moving objects. Not using continuous collision detection is faster to compute, but can miss small, fast-moving objects.
If [code]true[/code], internal force integration will be disabled (like gravity or air friction) for this body. Other than collision response, the body will only move as determined by the [method _integrate_forces] function, if defined.
This is multiplied by the global 3D gravity setting found in [b]Project > Project Settings > Physics > 3d[/b] to produce RigidBody3D's gravity. For example, a value of 1 will be normal gravity, 2 will apply double gravity, and 0.5 will apply half gravity to this object.
The body's moment of inertia. This is like mass, but for rotation: it determines how much torque it takes to rotate the body on each axis. The moment of inertia is usually computed automatically from the mass and the shapes, but this property allows you to set a custom value.
If set to [code]Vector3.ZERO[/code], inertia is automatically computed (default value).
Damps the body's movement. By default, the body will use the [b]Default Linear Damp[/b] in [b]Project > Project Settings > Physics > 3d[/b] or any value override set by an [Area3D] the body is in. Depending on [member linear_damp_mode], you can set [member linear_damp] to be added to or to replace the body's damping value.
The body's linear velocity in units per second. Can be used sporadically, but [b]don't set this every frame[/b], because physics may run in another thread and runs at a different granularity. Use [method _integrate_forces] as your process loop for precise control of the body state.
The maximum number of contacts that will be recorded. Requires a value greater than 0 and [member contact_monitor] to be set to [code]true[/code] to start to register contacts. Use [method get_contact_count] to retrieve the count or [method get_colliding_bodies] to retrieve bodies that have been collided with.
[b]Note:[/b] The number of contacts is different from the number of collisions. Collisions between parallel edges will result in two contacts (one at each end), and collisions between parallel faces will result in four contacts (one at each corner).
If [code]true[/code], the body will not move and will not calculate forces until woken up by another body through, for example, a collision, or by using the [method apply_impulse] or [method apply_force] methods.
Emitted when a collision with another [PhysicsBody3D] or [GridMap] occurs. Requires [member contact_monitor] to be set to [code]true[/code] and [member max_contacts_reported] to be set high enough to detect all the collisions. [GridMap]s are detected if the [MeshLibrary] has Collision [Shape3D]s.
Emitted when the collision with another [PhysicsBody3D] or [GridMap] ends. Requires [member contact_monitor] to be set to [code]true[/code] and [member max_contacts_reported] to be set high enough to detect all the collisions. [GridMap]s are detected if the [MeshLibrary] has Collision [Shape3D]s.
Emitted when one of this RigidBody3D's [Shape3D]s collides with another [PhysicsBody3D] or [GridMap]'s [Shape3D]s. Requires [member contact_monitor] to be set to [code]true[/code] and [member max_contacts_reported] to be set high enough to detect all the collisions. [GridMap]s are detected if the [MeshLibrary] has Collision [Shape3D]s.
[param body_rid] the [RID] of the other [PhysicsBody3D] or [MeshLibrary]'s [CollisionObject3D] used by the [PhysicsServer3D].
[param body] the [Node], if it exists in the tree, of the other [PhysicsBody3D] or [GridMap].
[param body_shape_index] the index of the [Shape3D] of the other [PhysicsBody3D] or [GridMap] used by the [PhysicsServer3D]. Get the [CollisionShape3D] node with [code]body.shape_owner_get_owner(body.shape_find_owner(body_shape_index))[/code].
[param local_shape_index] the index of the [Shape3D] of this RigidBody3D used by the [PhysicsServer3D]. Get the [CollisionShape3D] node with [code]self.shape_owner_get_owner(self.shape_find_owner(local_shape_index))[/code].
Emitted when the collision between one of this RigidBody3D's [Shape3D]s and another [PhysicsBody3D] or [GridMap]'s [Shape3D]s ends. Requires [member contact_monitor] to be set to [code]true[/code] and [member max_contacts_reported] to be set high enough to detect all the collisions. [GridMap]s are detected if the [MeshLibrary] has Collision [Shape3D]s.
[param body_rid] the [RID] of the other [PhysicsBody3D] or [MeshLibrary]'s [CollisionObject3D] used by the [PhysicsServer3D]. [GridMap]s are detected if the Meshes have [Shape3D]s.
[param body] the [Node], if it exists in the tree, of the other [PhysicsBody3D] or [GridMap].
[param body_shape_index] the index of the [Shape3D] of the other [PhysicsBody3D] or [GridMap] used by the [PhysicsServer3D]. Get the [CollisionShape3D] node with [code]body.shape_owner_get_owner(body.shape_find_owner(body_shape_index))[/code].
[param local_shape_index] the index of the [Shape3D] of this RigidBody3D used by the [PhysicsServer3D]. Get the [CollisionShape3D] node with [code]self.shape_owner_get_owner(self.shape_find_owner(local_shape_index))[/code].
Emitted when the physics engine changes the body's sleeping state.
[b]Note:[/b] Changing the value [member sleeping] will not trigger this signal. It is only emitted if the sleeping state is changed by the physics engine or [code]emit_signal("sleeping_state_changed")[/code] is used.
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.
Kinematic body freeze mode. Similar to [constant FREEZE_MODE_STATIC], but collides with other bodies along its path when moved. Useful for a frozen body that needs to be animated.
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.
