Working

shaders/env.fragment

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+uniform samplerCube Texture;
+
+varying vec3 dir;
+
+void main(){
+	gl_FragColor = textureCube(Texture, normalize(dir));
+	//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);
+	
+}

shaders/env.vertex

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+attribute vec3 vPosition;
+
+uniform mat4 ProjectionModelViewMatrix;
+
+varying vec3 dir;
+
+void main(){
+	vec4 realVertexPos = vec4(vPosition.xyz, 1.0);
+	gl_Position = ProjectionModelViewMatrix * realVertexPos;
+
+	dir = vPosition;
+}

shaders/env_reverse.fragment

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+uniform samplerCube Env;
+
+varying vec3 dir;
+
+void main(){
+	gl_FragColor = textureCube(Env, normalize(dir));
+	
+	vec4 fogColor = vec4(0.25, 0.55, 1.0, 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);
+	
+}

shaders/env_reverse.vertex

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+attribute vec3 vPosition;
+
+uniform mat4 ProjectionMatrix;
+uniform mat3 ModelRotateMatrix;
+uniform vec3 ModelTranslateVector;
+
+varying vec3 dir;
+
+void main(){
+	vec4 realVertexPos = vec4(ModelRotateMatrix * vPosition.xyz + ModelTranslateVector, 1.0);
+	gl_Position = ProjectionMatrix * realVertexPos;
+
+	dir = -vPosition;
+}

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);
+	
+}

shaders/env_reverse_night.vertex

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+attribute vec3 vPosition;
+
+uniform mat4 ProjectionMatrix;
+uniform mat3 ModelRotateMatrix;
+uniform vec3 ModelTranslateVector;
+
+varying vec3 dir;
+
+void main(){
+	vec4 realVertexPos = vec4(ModelRotateMatrix * vPosition.xyz + ModelTranslateVector, 1.0);
+	gl_Position = ProjectionMatrix * realVertexPos;
+
+	dir = -vPosition;
+}