# 3D Joints

<a href="/demos/3d_joints.html">Play Demo</a>

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 packages/graphics/examples/3d_joints.py

## Source Code

```{literalinclude} ../../packages/graphics/examples/3d_joints.py
:language: python
:linenos:
```