public override SampledSpectrum Sample(ref Vector3 point, Scene scene, out Vector3 incomingVector,
out VisibilityTester visibilityTester)
{
var r1 = StaticRandom.NextFloat() * 2 - 1;
var r2 = StaticRandom.NextFloat() * 2 - 1;
var pointInDiskLocal = new Vector3(r1 * _radius, 0, r2 * _radius);
var pointInDiskWorld = ObjectToWorld.TransformPoint(ref pointInDiskLocal);
incomingVector = point - pointInDiskWorld;
var cosangle = Vector3.Dot(incomingVector.Normalized(), _normal);
visibilityTester = new VisibilityTester(pointInDiskWorld, point, scene);
return(Spectrum * cosangle / incomingVector.Length);
}
/// <summary>
/// Get the samples
/// </summary>
/// <returns></returns>
public override IEnumerable <Sample> Samples()
{
for (var y = 0f; y < Screen.Height; ++y)
{
for (var x = 0f; x < Screen.Width; ++x)
{
for (var i = 0; i < NumberOfSamples; ++i)
{
yield return(new Sample(MathHelper.Clamp(x + StaticRandom.NextFloat(), 0, Screen.Width - 1),
MathHelper.Clamp(y + StaticRandom.NextFloat(), 0, Screen.Height - 1)));
}
}
}
}
public TestMaterial(float?reflectiveness = null, SampledSpectrum spectrum = null)
{
_reflectiveness = reflectiveness ?? StaticRandom.NextFloat();
_spectrum = spectrum ?? SampledSpectrum.Random() * 0.3f;
}