# 3D Physics Playground

falling bodies and a walking character.

```{raw} html
<a class="example-run-button" href="../demos/features_physics_playground3d.html">▶ Run in browser</a>


```

**Tags:** `physics` `3d` `character`

Drop a batch of spheres and boxes onto a static slab, then walk a glowing
character through the pile. The character is an ordinary kinematic body, so the
falling bodies collide with it and can come to rest on its head; walk out from
under a resting box and it is left behind to fall, because a character carries
no riders.

Shows:
  - PhysicsBody3D (mode=DYNAMIC) spheres and boxes falling under gravity and
    resting or stacking on a PhysicsBody3D (mode=STATIC) slab; the world steps
    them and writes their poses back to the nodes each fixed step.
  - CharacterBody3D moved with move_and_slide() and is_on_floor(), with gravity
    read from the world it lives in and integrated by game code each fixed step.
    move_and_slide writes the deflected velocity back, so the next step reads its
    vertical speed straight off the character.
  - The standard body recipe: a CollisionShape3D child for the physics plus a
    MeshInstance3D child for the visual, which inherits the body's transform.
  - A VirtualJoystick and VirtualButtons that inject the same keys the keyboard
    uses, so the demo plays with a mouse or a finger as well.

The world is Y-up, so gravity (-Y) and the visuals agree. Movement is
camera-relative: pushing the stick (or W) away from you walks the character away
from the camera, whichever way it is orbited.

Controls:
    WASD    - move the character (camera-relative)
    Arrows  - orbit the camera
    R       - drop a fresh batch of bodies
    Escape  - quit
    On-screen stick and buttons - move, orbit, drop (mouse or touch)

Run: uv run python examples/features/physics/playground3d.py
Headless self-check: uv run python examples/features/physics/playground3d.py --test

## Source

```{literalinclude} ../../examples/features/physics/playground3d.py
:language: python
:linenos:
```