# Screen-space reflections

a glossy floor mirroring the scene above it.

```{raw} html
<a class="example-run-button" href="../demos/features_3d_ssr.html">▶ Run in browser</a>

```

**Tags:** `3d` `ssr` `reflections` `screen-space` `pbr`

Screen-space reflections (design D7) trace the reflected view ray through the
depth buffer + thin G-buffer and feed the result into the pluggable
indirect-specular ambient hook (design D8), so the glossy floor mirrors the
coloured pillars and floating shapes standing on it without any cubemap or probe.
The reflection is Hi-Z traced at half resolution and roughness-aware: the mirror
floor gives a sharp reflection, the frosted panel a blurred one, and reflections
fade as they approach the screen edge (the on-screen-only limit of SSR). A ray
that leaves the screen falls back to the flat/IBL ambient, so nothing goes black.


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

Controls:
    Space   - Toggle SSR on/off
    Escape  - Quit

## Source

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