Color sampleLights(Scene scene, Ray n, Random rand)
{
var nLights = scene.Lights.Length;
if (nLights == 0)
{
return(Color.Black);
}
if (LightMode.Equals(LightMode.LightModeAll))
{
Color result = new Color();
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(nLights));
}
}