public override Illuminance Spotlight(World World, Shape Shape, Vector3 Spot, Ray Ray, Vector3 Normal)
{
Vector3 Incident = Point.Sub(Spot);
double Dl = Incident.Norm() - MathHelper.Epsilon;
Incident.Normalize();
Ray shadow = new Ray(Spot.Add(Incident.Mul(MathHelper.Epsilon)), Incident);
foreach (var s in World.Shapes)
{
var t = s.Intersection(shadow);
if (t < Dl)
{
return(Illuminance.Black);
}
}
double d = Normal.Dot(Incident).ToRate();
Illuminance ld = Shape.Material.DRC.Mul(Illuminance.Mul(d));
if (d > 0.0 && (!Shape.Material.SRC.IsDark()) && Shape.Material.Shininess > 0.0)
{
Vector3 r = Normal.Mul(d * 2).Sub(Incident).Normalized();
Vector3 v = Ray.Direction.Reversed();
ld = ld.Add(Illuminance.Mul(Shape.Material.SRC.Mul(Math.Pow(r.Dot(v).ToRate(), Shape.Material.Shininess))));
}
return(ld);
}
public override Illuminance Spotlight(World World, Shape Shape, Vector3 Spot, Ray Ray, Vector3 Normal)
{
if (Shape.Material.ARC.IsDark())
{
return(Illuminance.Black);
}
return(l.Mul(Shape.Material.ARC));
}
