Why texCUBE always return zero?

Hi,all

I find that texCUBE always return zero using Pix debug tool, the inReflect coodinate isn't zero; Does anyone know the error? Thanks!

This is my code:


texture EnvironmentMap
<
string type = "CUBE";
string name = "Snow.dds";
>;

samplerCUBE EnvMap = sampler_state
{
Texture = (EnvironmentMap);
MipFilter = LINEAR;
MinFilter = LINEAR;
MagFilter = LINEAR;
AddressU = Wrap;
AddressV = Wrap;
};


sampler2D Wood;



float4 Main(float2 inTxr: TEXCOORD0,float3 inReflect: TEXCOORD1) : COLOR
{
float4 tmp=texCUBE(EnvMap,inReflect.xyz);
return tmp;
}