> > And what happens when the ray is reflected or refracted?
> not much :)
That's the problem. The cone had to change its size.

> > I don't think that it is possible to implement a method which works only
for
> > a few types of objects.
> but maybe enough types to make it worth implementing?
An implementation would be too complex and the number of supported types too
small (as Warp said).

> > Also, the cone is represented by a second order equation (IIRC), but the
ray
> > is only a first order equation.
> I never said it would be fast :)
The quality decreases drastically when using an approximation.

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