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godot shaders

Radial chromatic aberration

Split the red, green and blue channels radially so colour fringes grow toward the screen edges like a cheap lens, with several samples per channel to smear the fringe instead of doubling it.

Recorded render of Radial chromatic aberration

What this component contains

  • ATTRIBUTION.md
  • LICENSE
  • README.md
  • component.json
  • demo.tscn
  • inspect_shader.py
  • material.tres
  • post_chromatic_aberration.gdshader
  • preview.png
  • test_package.py
  • verification/native.json

How it works

Shader type
spatial
Render modes
unshaded, cull_disabled, depth_test_disabled, depth_draw_never, skip_vertex_transform, fog_disabled
Parameters
screen_texture (sampler2D), strength (float = 0.012), falloff_power (float = 2), samples (int = 6), center_x (float = 0.5), center_y (float = 0.5)
Use it on
A MeshInstance3D with a 2 x 2 QuadMesh, `material.tres` as its material override and a large extra cull margin, as in `demo.tscn`.
Result
The scene with red and blue fringes along edges that widen toward the corners.
Renderers
compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
Placement
res://baltor/godot_shaders/post_chromatic_aberration/

Recorded checks

godot 4.7.2.stable.official.ed1daf0bf

  • contract_static
  • engine_run
  • engine_log_clean
  • shader_in_scene
  • capture_written
  • render_not_uniform
  • shader_changes_pixels

Limits to consider

Three channels only, so the fringe is red and blue rather than a full spectrum. Edges of the screen clamp the samples. The pass reads Godot's screen texture after opaque geometry, so transparent objects drawn after it are not processed and its order among other transparent passes is not controlled.