Hinge joint definition reference for the Physics Core 2D API
Explore the properties you can use to configure a hinge joint in the Editor.
Read time 3 minutesLast updated 11 days ago
Note
This documentation is about writing C# scripts using the API. To use 2D physics in the Unity Editor using components like the Rigidbody 2D component, refer to 2D physics instead.
Unity.U2D.PhysicsExplore the properties you can use to configure a Physics Core 2D API hinge joint in the Unity Editor.
A hinge joint places two bodies at the same location, and allows the second body to rotate while connected to the first.
Property | Sub-property | Description |
|---|---|---|
| Local Anchor A | N/A | Sets where one end of the joint connects to the first body. |
| N/A | Position | Sets the position where the end of the joint connects, relative to the position of the first body. |
| N/A | Rotation | Sets the rotation of the anchor in degrees. |
| Local Anchor B | N/A | Sets where the other end of the joint connects to the second body. |
| N/A | Position | Sets the position where the end of the joint connects, relative to the position of the second body. |
| N/A | Rotation | Sets the rotation of the anchor in degrees. |
| Enable Spring | N/A | Enables Spring Target Angle, Spring Frequency and Spring Damping. The joint acts as a spring, so it stretches and compresses to try to make the angles of the two bodies the same. The strength of the pull is proportional to the current angle between the bodies. |
| Spring Target Angle | N/A | Sets the target angle in degrees. |
| Spring Frequency | N/A | Sets the stiffness of the spring in Hertz (cycles per second). A higher value makes the spring less stiff. The default is 0. |
| Spring Damping | N/A | Sets how quickly the spring stops pulling or pushing. A higher value makes the spring settle more quickly. The default is 0. |
| Enable Motor | N/A | Enables Motor Speed and Max Motor Torque, which make the joint act as a motor to rotate the second body. |
| Motor Speed | N/A | Sets the target rotation, in degrees per second. |
| Max Motor Torque | N/A | Sets the maximum force that the motor applies to reach the target rotation, in newtons. |
| Enable Limit | N/A | Enables Lower Angle Limit and Upper Angle Limit, which limit the angles of the two connected bodies. |
| Lower Angle Limit | N/A | Sets the minimum angle in degrees. The default is 0, which means no limit. |
| Upper Angle Limit | N/A | Sets the maximum angle in degrees. The default is 0, which means no limit. |
| Force Threshold | N/A | Sets the amount of linear force that creates an |
| Torque Threshold | N/A | Sets the amount of rotational force that creates an |
| Tuning Frequency | N/A | Sets the overall stiffness of the joint in Hertz (cycles per second). A higher value makes the joint less stiff. |
| Tuning Damping | N/A | Sets how quickly overall the joint stops pulling or pushing. A higher value makes the joint settle more quickly. |
| Draw Scale | N/A | Scales the joint Unity draws as a debug visualization. For more information, refer to Draw a debug visualization of objects. |
| Collide Connected | N/A | Enables the shapes creating collision or trigger events when they come into contact with each other. For more information, refer to Collisions and interactions in the Physics Core 2D API. |
| World Drawing | N/A | Draws the joint when Unity draws the debug visualization of the world. For more information, refer to Draw a debug visualization of objects. |