# 3D Joints

Pendulum chain and hinge door using physics joints.

```{raw} html
<a class="example-run-button" href="../demos/features_3d_joints.html">▶ Run in browser</a>

```

**Tags:** `3d`

Demonstrates:
  - PinJoint3D: chain of RigidBody3D spheres swinging as a pendulum
  - HingeJoint3D: door panel rotating on a vertical hinge axis
  - StaticBody3D as fixed anchor / hinge post
  - PhysicsServer handles all constraint solving automatically

Controls:
    Space       - Push the door
    R           - Reset scene
    Left/Right  - Orbit camera
    Escape      - Quit

Run: uv run python examples/features/3d/joints.py

## Source

```{literalinclude} ../../examples/features/3d/joints.py
:language: python
:linenos:
```