Sun Pulse Glow

A soft, radially symmetric glow that gently breathes in and out from the center. Great for sun orbs, magic circles, or ambient light sources.

Apply it to a TextureRect or ColorRect sized to your desired glow area. No texture needed, it renders entirely from UV coordinates.

Uniforms:

• Speed – how fast the pulse breathes
• Glow Strength – overall brightness of the glow
• Edge Softness – how gradually the glow fades at the outer edge
• Color – tint color of the glow

Shader code

shader_type canvas_item;

uniform float speed         : hint_range(0.0, 2.0) = 0.3;
uniform float glow_strength : hint_range(0.0, 2.0) = 0.8;
uniform float edge_softness : hint_range(0.0, 1.0) = 0.15;
uniform vec4  color : source_color = vec4(0.98, 0.92, 0.79, 1.0);

void fragment() {
    vec2  uv   = UV - vec2(0.5);
    float dist = length(uv);

    float fade  = smoothstep(0.8, 0.2, dist);
    float edge  = smoothstep(0.5, 0.5 - edge_softness, dist);
    float pulse = 0.85 + 0.15 * sin(TIME * speed * 6.0);

    float final = fade * edge * glow_strength * pulse;
    COLOR = vec4(color.rgb * final, final);
}

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