# Custom post-process

a user GLSL effect runs on the TAA-resolved image before tonemap.

```{raw} html
<span class="example-docs-badge">📄 Docs only</span>

```

**Tags:** `3d`

A ``PostProcessEffect`` injects a fullscreen GLSL pass between the built-in
post-processing and tonemap. It receives the current frame colour (``u_colour_tex``),
depth (``u_depth_tex``), resolution and time, plus any uniforms you set. The effect
below applies radial chromatic aberration and a vignette.

The scene runs with temporal anti-aliasing ON, so the custom effect samples the
TAA-RESOLVED (anti-aliased) image, and tonemap samples the effect's output: the
resolve and the user effect compose correctly rather than one discarding the other.
Toggling the effect off while TAA stays on returns cleanly to the plain resolved
image.

``u_colour_tex`` clamps at the frame edge by default (correct for neighbourhood
taps); pass ``wrap="repeat"`` / ``"mirror"`` to ``PostProcessEffect`` for an effect
that deliberately tiles the framebuffer.

Controls:
    E / click / tap : Toggle the custom effect on/off
    T               : Toggle TAA on/off
    ESC             : Quit

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

## Source

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