# Render scale

the 3D scene at half resolution, the UI at native resolution.

```{raw} html
<a class="example-run-button" href="../demos/features_3d_render_scale.html">▶ Run in browser</a>

```

**Tags:** `3d` `render-scale` `quality` `post-processing`

``WorldEnvironment.render_scale`` sizes the whole HDR chain (colour, depth,
SSAO, bloom) at ``ceil(window * render_scale)``; the tonemap pass bilinearly
upscales to the window (enable TAA to upgrade the upscale to temporal
upsampling instead, see taau.py). This trades sharpness for fill-rate: the
scene here renders at 0.5 (a quarter of the pixels) while the 2D overlay text
stays crisp because screen-space 2D always draws at native resolution after
the upscale. The thin pillars and the glowing sphere make the softening easy
to see when switching scales at runtime.


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

Controls:
    1 / 2 / 3 / 4 - render_scale 0.25 / 0.5 / 0.75 / 1.0
    Escape        - quit

## Source

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