public bool Intersect(Ray ray, out Prec t, out SceneObject obj)
{
var inf = 1.0e20;
var tt = inf;
var oo = default(SceneObject);
foreach (var o in Objects) {
var d = o.Intersect (ray);
if (d != 0 && d < tt) {
tt = d;
oo = o;
}
}
t = tt;
obj = oo;
return tt < inf;
}
public override double Intersect(Ray ray)
{
var op = Position - ray.Origin;
var eps = 1.0e-4;
var b = op.Dot (ray.Direction);
var det = b*b - op.Dot (op) + Radius*Radius;
if (det < 0) return 0;
det = Math.Sqrt (det);
var t = b - det;
if (t > eps) return t;
t = b + det;
return (t > eps) ? t : 0;
}
public abstract double Intersect(Ray ray);