internal double TraceRay(Ray ray, Vector light)
{
IntersectionPoint p = Intersect(ray,
new IntersectionPoint(
double.PositiveInfinity, new Vector(0.0, 0.0, 0.0)));
if (double.IsInfinity(p.distance))
{
return(0.0);
}
double greyscale = -(p.normal * light);
if (greyscale <= 0.0)
{
return(0.0);
}
Vector o = ray.origin +
(p.distance * ray.direction) + (Epsilon * p.normal);
Ray shadowRay = new Ray(o, new Vector(0.0, 0.0, 0.0) - light);
IntersectionPoint shadowp = Intersect(shadowRay,
new IntersectionPoint(double.PositiveInfinity, p.normal));
return(double.IsInfinity(shadowp.distance) ? greyscale : 0.0);
}
override internal IntersectionPoint Intersect(Ray r, IntersectionPoint p)
{
if (bound.Distance(r) < p.distance)
{
foreach (Scene each in scenes)
{
p = each.Intersect(r, p);
}
}
return(p);
}
override internal IntersectionPoint Intersect(Ray r, IntersectionPoint p)
{
double d = Distance(r);
if (d < p.distance)
{
Vector v = r.origin + ((d * r.direction) - center);
p = new IntersectionPoint(d, v.Normalized());
}
return(p);
}
abstract internal IntersectionPoint Intersect(Ray ray, IntersectionPoint p);
