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

struct v2f
{
    float4 Position : POSITION; //in projection space
    float4 Color : COLOR;
    float4 TexCoords : TEXCOORD0;
};

float4 main(v2f IN, uniform sampler3D colourMap : TEXUNIT0) : COLOR
{

       float3 colourMapValue = tex3D(colourMap, IN.TexCoords.xyz).rgb;


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