Godot-Shader-Lib/addons/ShaderLib/RayMarching/RayMarch.gdshaderinc

float ray_march(vec3 ray_origin, vec3 ray_dir, int max_steps, float max_dist, float dist_threshold, float signed_dist) {
	ray_dir = normalize(ray_dir);
	dist_threshold = abs(dist_threshold);
	float dist_from_origin = 0.;
	float dist_to_surface;
	for(int i = 0; i < max_steps; i++) {
		vec3 point = ray_origin + dist_from_origin * ray_dir;
		dist_to_surface = signed_dist;
		dist_from_origin += dist_to_surface;
		if(dist_to_surface < dist_threshold || dist_to_surface > max_dist)
			break;
	}
	return dist_from_origin;
}