public override Spectrum SampleL(Scene scene, LightSample ls, float u1, float u2, float time, out Ray ray, out Normal ns, out float pdf)
{
ray = new Ray(_lightPosition,
MonteCarloUtilities.UniformSampleSphere(ls.UPos0, ls.UPos1),
0.0f, float.PositiveInfinity, time);
ns = (Normal)ray.Direction;
pdf = MonteCarloUtilities.UniformSpherePdf();
return(_intensity);
}
public override Point Sample(float u1, float u2, out Normal ns)
{
Point p = new Point(0, 0, 0) + _radius * MonteCarloUtilities.UniformSampleSphere(u1, u2);
ns = Normal.Normalize(ObjectToWorld.TransformNormal(new Normal(p.X, p.Y, p.Z)));
if (ReverseOrientation)
{
ns *= -1.0f;
}
return(ObjectToWorld.TransformPoint(ref p));
}
