private void ComputeMoon (double altitude)
{
Vector3 moonPos = ephemeris.GetMoonPositionHorizon ();
moonPos.Normalize ();
double cosZenith = moonPos.y;
double zenith = Math.Acos (cosZenith);
if (lastMoonT != T || lastMoonZenith != zenith) {
lastMoonT = T;
lastMoonZenith = zenith;
lightingChanged = true;
SilverLiningSpectrum moonSpectrumEarthDirect = new SilverLiningLunarSpectrum ();
SilverLiningSpectrum moonSpectrumEarthScattered = new SilverLiningLunarSpectrum ();
lunarSpectrum.ApplyAtmosphericTransmittance (zenith, cosZenith, T, altitude, ref moonSpectrumEarthDirect, ref moonSpectrumEarthScattered);
float moonLuminance = MoonLuminance ();
moonTransmittedLuminance = moonSpectrumEarthDirect.ToXYZ () * moonLuminance;
moonScatteredLuminance = moonSpectrumEarthScattered.ToXYZ () * moonLuminance;
if (isOvercast) {
moonTransmittedLuminance = (moonTransmittedLuminance * (overcastBlend * overcastTransmission)) + (moonTransmittedLuminance * (1.0f - overcastBlend));
moonScatteredLuminance = (moonScatteredLuminance * (overcastBlend * overcastTransmission)) + (moonScatteredLuminance * (1.0f - overcastBlend));
}
moonTransmittedLuminance = moonTransmittedLuminance * moonTransmissionScale;
moonScatteredLuminance = moonScatteredLuminance * moonScatteredScale;
}
}
