struct a2v
{
    float4 Position : POSITION; //in object space
    float3 Normal : NORMAL;
};

struct v2f
{
    float4 Position : POSITION; //in projection space
    float4 TexCoords : TEXCOORD0;
    float3 LightDirection : TEXCOORD1;
    float3 Normal : TEXCOORD2;
};

float4 main(v2f IN, uniform sampler3D colourMap : TEXUNIT0, uniform sampler3D normalMap : TEXUNIT1) : COLOR
{
       float3 normalMapValue = tex3D(normalMap, IN.TexCoords.xyz).rgb;
       normalMapValue = (normalMapValue - 0.5) * 2;

       float3 finalNormal = normalize(IN.Normal + normalMapValue);
       
       float3 colourMapValue = tex3D(colourMap, IN.TexCoords.xyz).rgb;

       
       // calculate light vector
	   //float3 Normal = normalize(IN.Color.xyz);
	  /* float3 Normal = (IN.Color.xyz * 2) - float3(1.0,1.0,1.0);
	   Normal = normalize(Normal+ normalAdjustment);
	   float3 lightDirection = normalize(float3(1,1,1)); */

	   // Calculate diffuse component
	   float diffuse = max(dot(finalNormal, IN.LightDirection) , 0);

	   diffuse += 0.3;

	   //OUT.Color = ambient + float4(diffuse,diffuse,diffuse,1.0);


       //return float4(detailColor * IN.Color.rgb, 1.0);
       
       return float4(colourMapValue*diffuse, 1.0);
}

/*float4 main(v2f IN, uniform sampler3D detailTexture : TEXUNIT0) : COLOR
{
       float3 detailColor = tex3D(detailTexture, IN.TexCoords.xyz).rgb;
       return float4(detailColor * IN.Color.rgb, 1.0);
}    */