Sandstorm / Fog Shader (Godot 4.X)

A fog shader made for Godot 4.X to recreate moving fog or a sandstorm, snowstorm etc.

Shader code

shader_type fog;

uniform sampler2D noise_tex:repeat_enable;
uniform float noise_scale : hint_range(0.0, 1.0, 0.0001)  = 1.0;
uniform float flatness : hint_range(0.0, 50.0, 0.1) = 1.0;
uniform float density : hint_range(0.0, 6.0, 0.0001) = 1.0;
uniform sampler2D grad_tex;
uniform vec3 emision: source_color;
uniform float fog_speed : hint_range(-5.0, 5.0, 0.001) = 1.0;


void fog() {
	vec2 move_uv = vec2(0.1, 0.1) * TIME * fog_speed;
	float detail_noise = texture(noise_tex, WORLD_POSITION.xz*noise_scale + move_uv*0.5).r;
	float noise = texture(noise_tex, WORLD_POSITION.xz*noise_scale + move_uv + detail_noise).r;
	DENSITY = mix(1.0, noise, UVW.y*flatness);
	DENSITY *= step(0.0, -SDF)*density;
	vec3 col = texture(grad_tex, vec2(DENSITY, 0.5)).rgb;
	ALBEDO = vec3(col);
	EMISSION = emision;
}

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