# Mouse picking demo

click cubes to change their colour.

```{raw} html
<a class="example-run-button" href="../demos/features_3d_picking.html">▶ Run in browser</a>

```

**Tags:** `3d`

Uses the engine's GPU object-picking buffer: set ``shape.pickable = True`` and
override ``on_picked``. For the manual approach (casting a world-space ray with
``screen_to_ray`` and intersecting a ``CollisionWorld`` yourself) see ``raycast.py``.

Usage:
    uv run python examples/features/3d/picking.py

## Source

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