public Colour Mix(Colour b, double pct)
{
Colour a = MulScalar(1 - pct);
b = b.MulScalar(pct);
return(a.Add(b));
}
Colour sampleLights(Scene scene, Ray n, Random rand)
{
var nLights = scene.Lights.Length;
if (nLights == 0)
{
return(Colour.Black);
}
if (LightMode == LightMode.LightModeAll)
{
Colour result = new Colour();
foreach (var light in scene.Lights)
{
result = result.Add(sampleLight(scene, n, rand, light));
}
return(result);
}
else
{
// pick a random light
var light = scene.Lights[rand.Next(nLights)];
return(sampleLight(scene, n, rand, light).MulScalar((double)nLights));
}
}
public void AddSample(Colour sample)
{
Interlocked.Increment(ref Samples);
if (Samples == 1)
{
M = sample;
return;
}
Colour m = M;
M = M.Add(sample.Sub(M).DivScalar((double)Samples));
V = V.Add(sample.Sub(m).Mul(sample.Sub(M)));
}
