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This physics body implements all the physics logic needed to simulate a car. It is based on the raycast vehicle system commonly found in physics engines. Aside from a CollisionShape3D for the main body of the vehicle, you must also add a VehicleWheel3D node for each wheel. You should also add a MeshInstance3D to this node for the 3D model of the vehicle, but this model should generally not include meshes for the wheels. You can control the vehicle by using the brake, engine_force, and steering properties. The position or orientation of this node shouldn't be changed directly.
Slows down the vehicle by applying a braking force. The vehicle is only slowed down if the wheels are in contact with a surface. The force you need to apply to adequately slow down your vehicle depends on the RigidBody3D.mass of the vehicle. For a vehicle with a mass set to 1000, try a value in the 25 - 30 range for hard braking.
Accelerates the vehicle by applying an engine force. The vehicle is only sped up if the wheels that have VehicleWheel3D.use_as_traction set to true and are in contact with a surface. The RigidBody3D.mass of the vehicle has an effect on the acceleration of the vehicle. For a vehicle with a mass set to 1000, try a value in the 25 - 50 range for acceleration.
Note: The simulation does not take the effect of gears into account, you will need to add logic for this if you wish to simulate gears.
A negative value will result in the vehicle reversing.
The steering angle for the vehicle. Setting this to a non-zero value will result in the vehicle turning when it's moving. Wheels that have VehicleWheel3D.use_as_steering set to true will automatically be rotated.
Note: This property is edited in the inspector in degrees. In code the property is set in radians.
