public Color GetIncidentColor(Vector3 v)
{
Vector3 length = Vector3.Subtract(Position, v);
float dist = length.Length * length.Length;
return(LightColor.Div(dist));
}
public void Sample(HitRecord record, LightSample sample)
{
Vector3 wi = new Vector3(Position);
wi -= record.IntersectionPoint;
wi.Normalize();
Vector3 dist = Vector3.Subtract(Position, record.IntersectionPoint);
float ldist = dist.Length;
sample.LightColor = LightColor.Div(ldist * ldist);
sample.Wi = wi;
sample.Distance = ldist;
sample.Position = Position;
sample.Pdf = 1;
}
