Working

shaders/env_reverse_night.fragment

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+uniform samplerCube Env;
+
+varying vec3 dir;
+
+void main(){
+	gl_FragColor = textureCube(Env, normalize(dir));
+	
+	vec4 fogColor = vec4(0.05, 0.05, 0.1, 1.0);
+	
+	float coef = dir.y+1.0;
+	coef = clamp(coef, 0.0, 1.0);
+	
+	gl_FragColor = mix(gl_FragColor,fogColor, coef);
+	
+	//if (dir.z < 0)
+	//{
+	//	gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
+	//}
+	//gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
+	
+}