Physics joints — Fixed, Ball, Hinge, Slider, Spring, and Wheel

// All joints need two bodies: the joint's own GO body and an anchor body.
// Position the joint GO at the connection point.

var joint = gameObject.Components.Create<HingeJoint>();
joint.Body       = doorGameObject;        // the body being constrained
joint.AnchorBody = frameGameObject;       // what it's attached to (null = world)
joint.Strength   = 0f;                    // 0 = rigid, >0 = breakable

public sealed class Door : Component
{
    protected override void OnStart()
    {
        var hinge = Components.Create<HingeJoint>();
        hinge.Body       = Components.Get<Rigidbody>().GameObject;
        hinge.AnchorBody = frameObject;
        // Axis defaults to local Z — set GO rotation to align the hinge axis
    }
}

var spring = gameObject.Components.Create<SpringJoint>();
spring.Body         = objectA;
spring.AnchorBody   = objectB;
spring.Strength     = 500f;   // spring stiffness

var wheel = axleObject.Components.Create<WheelJoint>();
wheel.Body         = wheelObject;
wheel.AnchorBody   = chassisObject;
wheel.Strength     = 1000f;         // suspension strength

joint.Strength        = 2000f;  // breaks at 2000 force units
joint.AngularStrength = 500f;   // separate limit for torque

public sealed class BreakableJoint : Component
{
    HingeJoint Joint { get; set; }

    protected override void OnUpdate()
    {
        if ( Joint == null || !Joint.IsValid() )
        {
            Log.Info( "Joint broke!" );
        }
    }
}