Simple Radial Chromatic Aberration + Distortion
A simple shader for a chromatic aberration + barrel/pincushion distortion effect. No specific node tree setup needed.
Shader code
shader_type canvas_item;
uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
uniform float strength : hint_range(0.0, 0.05) = 0.01;
uniform bool edge_falloff = true;
uniform float distortion_amount : hint_range(-1, 1) = -.08;
void fragment() {
vec2 p = SCREEN_UV - vec2(0.5);
float r2 = dot(p, p);
vec2 distorted_uv = p * (1.0 + distortion_amount * r2);
vec2 final_uv = distorted_uv + vec2(0.5);
vec2 direction = final_uv - vec2(0.5);
float dist = length(direction);
vec2 radial_offset = normalize(direction);
float intensity = edge_falloff ? dist : 1.0;
vec2 offset = radial_offset * strength * intensity;
float r = texture(SCREEN_TEXTURE, final_uv + offset).r;
float g = texture(SCREEN_TEXTURE, final_uv).g;
float b = texture(SCREEN_TEXTURE, final_uv - offset).b;
float a = texture(SCREEN_TEXTURE, final_uv).a;
COLOR = vec4(r, g, b, a);
}