Creating a chain in Unity is easier than most developers think. The key is not the model itself, but how you connect each link using physics joints.

A proper Unity chain uses Rigidbody components and joints so the links react naturally to gravity, forces, and collisions.

This guide shows how to create a fully working physics-based chain step by step.

Step 1: Create a Chain Link Prefab

Start by creating one chain link.

• Create a 3D object (Cube, Capsule, or imported chain link model)
• Add a Rigidbody component
• Add a Collider (BoxCollider, CapsuleCollider, or MeshCollider)

Important Rigidbody settings:

• Mass: 0.2 – 1 (lightweight for stability)
• Drag: 0
• Angular Drag: 0.05 – 0.2
• Collision Detection: Continuous (prevents tunneling)

Turn this object into a prefab by dragging it into your Project folder.

Step 2: Connect Links Using HingeJoint

Each link should connect to the previous one using a HingeJoint.

The HingeJoint allows rotation around a single axis, which is ideal for chains.

Step 3: Chain Spawner Script

Create a script called ChainSpawner.cs.

using UnityEngine;

public class ChainSpawner : MonoBehaviour
{
    public GameObject chainLinkPrefab;
    public int linkCount = 15;
    public float linkSpacing = 0.5f;

    private Rigidbody previousLink;

    void Start()
    {
        CreateChain();
    }

    void CreateChain()
    {
        for (int i = 0; i < linkCount; i++)
        {
            GameObject link = Instantiate(
                chainLinkPrefab,
                transform.position - new Vector3(0, i * linkSpacing, 0),
                Quaternion.identity
            );

            Rigidbody rb = link.GetComponent<Rigidbody>();

            if (i == 0)
            {
                rb.isKinematic = true;
            }
            else
            {
                HingeJoint joint = link.AddComponent<HingeJoint>();
                joint.connectedBody = previousLink;
                joint.axis = Vector3.forward;
                joint.useLimits = false;
            }

            previousLink = rb;
        }
    }
}

Attach this script to an empty GameObject. Assign your chain link prefab in the Inspector.

When you press Play, Unity will generate a connected chain.

Step 4: Stabilizing the Chain

Physics chains can become unstable if not configured correctly.

To improve stability:

• Keep link mass low
• Use small link spacing
• Increase Physics Solver Iterations

Go to:

Edit → Project Settings → Physics

Increase:

• Default Solver Iterations (8–12)
• Default Solver Velocity Iterations (8–12)

Step 5: Add Swing Limits (Optional)

If you want more controlled movement, enable joint limits.

joint.useLimits = true;

JointLimits limits = joint.limits;
limits.min = -45;
limits.max = 45;
joint.limits = limits;

This prevents extreme rotations and reduces instability.

Alternative: Using ConfigurableJoint

If you need more advanced behavior (like ropes or realistic cables), use ConfigurableJoint instead of HingeJoint.

ConfigurableJoint gives control over:

• Angular limits
• Spring strength
• Damping
• Break forces

It is more complex but more powerful.

Performance Tips

• Avoid very long chains (50+ links) on mobile
• Use simplified colliders
• Disable collision between adjacent links

You can disable collision between connected bodies:

joint.enableCollision = false;

Making a Rope Instead of a Chain

If you want a soft rope instead of rigid metal links:

• Use SpringJoint instead of HingeJoint
• Lower mass
• Add LineRenderer for visuals

Common Problems

Chain Exploding or Shaking

• Reduce mass
• Increase solver iterations
• Reduce spacing

Chain Stretching Too Much

• Use ConfigurableJoint with locked linear motion
• Increase solver iterations

Chain Falling Apart

• Make sure connectedBody is assigned correctly
• Ensure first link is kinematic

Final Thoughts

A realistic chain in Unity is built using physics joints, not animations. With correct Rigidbody settings and stable joint configuration, you can create hanging bridges, grappling hooks, chandeliers, or swinging traps.

The key to stability is lightweight links, proper solver settings, and controlled joint limits.

Once you understand how joints connect bodies, you can build almost any physics-driven system.