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Zosimas

Cannot retrieve LightVector in Pixel Shader

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Why when I use this in my HLSL shader, everything work fine:


struct vertexOutput {
float4 HPosition : POSITION;
float2 UV : TEXCOORD0;
float3 LightVec : TEXCOORD1;
float3 WorldNormal : TEXCOORD2;
float3 WorldTangent : TEXCOORD3;
float3 WorldBinormal : TEXCOORD4;
float3 WorldView : TEXCOORD5;
};

/*Pixel Shader*/
float4 depthMap_PS(vertexOutput IN) : COLOR
{
float3 Ln = normalize(IN.LightVec);
float c = length(Ln);
return float4(c,0,0,1);
}



but when I use this I get an "E_FAIL" error: ?


struct vertexOutput {
float4 HPosition : POSITION;
float2 UV : TEXCOORD0;
float3 LightVec : TEXCOORD1;
float3 WorldNormal : TEXCOORD2;
float3 WorldTangent : TEXCOORD3;
float3 WorldBinormal : TEXCOORD4;
float3 WorldView : TEXCOORD5;
};

/*Pixel Shader*/
float4 depthMap_PS(vertexOutput IN) : COLOR
{
float c = length(IN.lightVec);
return float4(c,0,0,1);
}



Why can't I get IN.LightVec in Pixel Shader?

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