Skybox_Frag_04.cg

half4 frag(v2f i) : COLOR
{
    half p = i.texcoord.y;

    float p1 = pow(min(1.0f, 1.0f - p), _Exponent);
    float p2 = 1.0f - p1;

    // Our moon circle
    half3 mie = calcSunSpot(_SunPosition.xyz, i.texcoord.xyz) * _SunColor;
    // Blend ground fog with the moon
    half3 col = _GroundColor * p1 + mie * p2;
    // Add sky color
    col += _SkyTint * p2;

    return half4(col, 1.0);
}