SkyBox Shader Fix

I have found my skybox shader has a bug in it, the shader displays the cubemap as a reflection, the following shader code will give a better result.

So, if you have used my skybox sample then replace the shader with this code:

Texture surfaceTexture;
samplerCUBE TextureSampler = sampler_state
{
texture = <surfaceTexture> ;
magfilter = LINEAR;
minfilter = LINEAR;
mipfilter = LINEAR;
AddressU = Mirror;
AddressV = Mirror;
};

float4x4 World : World;
float4x4 View : View;
float4x4 Projection : Projection;

float3 EyePosition : CameraPosition;

struct VS_INPUT
{
float4 Position : POSITION0;
float3 Normal : NORMAL0;
};

struct VS_OUTPUT
{
float4 Position : POSITION0;
float3 ViewDirection : TEXCOORD2;

};

float4 CubeMapLookup(float3 CubeTexcoord)
{
return texCUBE(TextureSampler, CubeTexcoord);
}

VS_OUTPUT Transform(VS_INPUT Input)
{
float4x4 WorldViewProjection = mul(mul(World, View), Projection);
float3 ObjectPosition = mul(Input.Position, World);

VS_OUTPUT Output;
Output.Position = mul(Input.Position, WorldViewProjection);


Output.ViewDirection = ObjectPosition - EyePosition;

return Output;
}

struct PS_INPUT
{
float3 ViewDirection : TEXCOORD2;
};

float4 BasicShader(PS_INPUT Input) : COLOR0
{
float3 ViewDirection = normalize(Input.ViewDirection);
ViewDirection.x *= -1;
return CubeMapLookup(ViewDirection);
}

technique BasicShader
{
pass P0
{
VertexShader = compile vs_2_0 Transform();
PixelShader = compile ps_2_0 BasicShader();
}
}

Sorry for giving you a crappy shader in the first place :P