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Sun trajectory: handle mNightStart <= mSunriseTime

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OMW Bug #781
Note:  mNightStart == mSunriseTime is treated as 24-hour night.
This commit is contained in:
Jordan Ayers 2015-02-08 14:26:38 -06:00
parent 23024d2beb
commit ec3487b669
1 changed files with 10 additions and 8 deletions
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18
apps/openmw/mwworld/weather.cpp
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@ -429,30 +429,32 @@ void WeatherManager::update(float duration, bool paused)
else
mRendering->getSkyManager()->sunEnable();
// Update the sun direction. Run it east to west at 15 degrees south from overhead.
// The sun's speed at day and night will differ, since mSunriseTime and mNightStart
// Update the sun direction. Run it east to west at a fixed angle from overhead.
// The sun's speed at day and night may differ, since mSunriseTime and mNightStart
// mark when the sun is level with the horizon.
{
assert( mNightStart > mSunriseTime );
// Shift times into a 24-hour window beginning at mSunriseTime...
float adjustedHour = mHour;
float adjustedNightStart = mNightStart;
if ( mHour < mSunriseTime )
adjustedHour += 24.f;
if ( mNightStart < mSunriseTime )
adjustedNightStart += 24.f;
const bool is_night = mHour >= mNightStart || mHour <= mSunriseTime;
const float dayDuration = mNightStart - mSunriseTime;
const bool is_night = adjustedHour >= adjustedNightStart;
const float dayDuration = adjustedNightStart - mSunriseTime;
const float nightDuration = 24.f - dayDuration;
double theta;
if ( !is_night ) {
theta = M_PI * (adjustedHour - mSunriseTime) / dayDuration;
} else {
theta = M_PI * (adjustedHour - mNightStart) / nightDuration;
theta = M_PI * (adjustedHour - adjustedNightStart) / nightDuration;
}
Vector3 final(
cos( theta ),
-0.268, // approx tan( 15 degrees )
-0.268f, // approx tan( -15 degrees )
sin( theta ) );
mRendering->setSunDirection( final, is_night );
}