Version: 2023.1
언어: 한국어
Target Joint 2D
Constant Force 2D

# 휠 조인트 2D

Use the Wheel Joint 2D to simulate a rolling wheel, on which an object can move. You can apply motor power to the joint. The wheel uses a suspension spring to maintain its distance from the main body of the vehicle.

## 프로퍼티

프로퍼티 기능
Enable Collision Enable this property to enable collisions between the two connected GameObjects.
Connected Rigid Body Specify the other GameObject this joint connects to. If you leave this as None, the other end of the joint is fixed to a point in space defined by the Connected Anchor setting. Select the circle icon to the right to view a list of GameObjects to connect to.
Auto Configure Connected Anchor Enable this property to automatically set the anchor location for the other GameObject this Hinge Joint 2D connects to. You do not need to enter coordinates for the Connected Anchor property if you enable this property.
Anchor Define where (in terms of x, y-coordinates on the Rigidbody 2D) the end point of the joint connects to this GameObject.
Connected Anchor Define where (in terms of x, y-coordinates on the Rigidbody 2D) the end point of the joint connects to the other GameObject.
Suspension Select this to expand this property’s settings.
Damping Ratio Set the degree to suppress spring oscillation. In the range 0 to 1, the higher the value, the less movement.
Frequency Set the frequency at which the spring oscillates while the GameObjects are approaching the separation distance you want (measured in cycles per second). In the range 0 to 1,000,000 - the higher the value, the stiffer the spring. Note: Setting Frequency to zero will create the stiffest spring type joint possible.
Angle Set the world movement angle for the suspension.
Use Motor Enable this to apply motor force to the joint.
Motor Select this to expand this property’s settings.
Motor Speed Target speed (degrees per second) for the motor to reach.
Maximum Motor Force Set the maximum torque (or rotation) the motor can apply when attempting to reach the target speed.
Break Action Set the action taken when either the force or torque threshold is exceeded.
Break Force Set the force threshold which if exceeded, will cause the joint to perform the selected Break Action. The default value is set to Infinity, which can never be exceeded and therefore the Break Action can never be taken while the threshold remains at this value.
Break Torque Set the torque threshold which if exceeded, will cause the joint to perform the selected Break Action. The default value is set to Infinity, which can never be exceeded and therefore the Break Action can never be taken while the threshold remains at this value.

## Using this joint

Use this joint to simulate wheels and suspension. The aim of the joint is to keep the position of two points on a line that extends to infinity, whilst at the same time making them overlap. Those two points can be two Rigidbody2D components or a Rigidbody2D component and a fixed position in the world. (Connect to a fixed position in the world by setting Connected Rigidbody to None).

휠 조인트 2D는 슬라이더 조인트 2D(모터나 한계 제한 없음) 및 힌지 조인트 2D(한계 제한 없음)을 조합한 것과 같이 움직입니다.

조인트는 라인 유지를 위한 연결된 리지드바디 오브젝트, 라인에서 오브젝트를 회전시키는 앵글 모터, 휠 서스펜션을 시뮬레이션하는 스프링에 직선 운동의 힘을 적용합니다.

Set the Maximum Motor Speed and Maximum Motor Force (torque, in this joint) to control the angular motor speed, and make the two rigid body objects rotate.

You can set the wheel suspension stiffness and movement in order to simulate different degrees of suspension. For example, to simulate a stiff, barely moving suspension:

• Set a high (1,000,000 is the highest) Frequency == stiff suspension.

• Set a high (1 is the highest) Damping Ratio == barely moving suspension.

To simulate a looser and more freely moving suspension, you would use the following settings:

• Set a low Frequency == loose suspension.

• Set a low Damping Ratio == moving suspension.

It has two simultaneous constraints:

• 두 리지드바디 오브젝트에서 두 앵커 포인트 사이의 특정 라인으로부터 떨어진 0 관련 선형 거리를 유지해야 합니다.
• Maintain an angular speed between two anchor points on two rigid body objects. (Set the speed via the Maximum Motor Speed option and maximum torque via Maximum Motor Force.)

이 조인트를 사용하여 회전하지만 지정한 라인으로부터 떨어질 수 없는 피벗으로 연결된 것처럼 움직여야 하는 실제 오브젝트를 구성할 수 있습니다. 예를 들면 다음과 같습니다.

• 휠을 구동하기 위한 모터와 서스펜션이 허용하는 움직임을 정의하는 선으로 휠을 시뮬레이션합니다.

## Behavior difference to the Wheel Collider

Unlike the Wheel Collider used with 3D physics, the Wheel Joint 2D uses a separate Rigidbody object for the wheel, which rotates when the force is applied. (The Wheel Collider, by contrast, simulates the suspension using a raycast and the wheel’s rotation is purely a graphical effect). The wheel object will typically be a Circle Collider 2D with a Physics Material 2D that gives the right amount of traction for your gameplay.