Sandstorm / Fog Shader (Godot 4.X)

REKIEX

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;
}
Tags
animated, clouds, dessert, Fog, foggy, sandstorm
The shader code and all code snippets in this post are under MIT license and can be used freely. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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2 Comments
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Jbx
Jbx
3 months ago

Hi,
I try to reproduce the sandstorm without success, can you give a minimal example ? That would help me a lot.

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name
name
2 days ago
Reply to  Jbx

Probably late but, you need to fiddle around with the values. Here’s something that worked for me:
noise scale: 0.01
flatness: 30
density: 0.1

Then, make sure Volume Size and Volume Depth are high enough (196 for example, as I saw suggested in another shader). You can reach those two settings by going to Project -> Project Settings -> General -> Rendering -> Environment -> Volumetric Fog (you need Advanced Settings on for that I think).

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