> If this is possible, you could shoot cones instead of rays.  If the cone
> intersects an object, but the ax of the cone (the traced ray with ordinary
> raytracing) doesn't, that pixel should be supersampled.
> Might not be possible for every object (isosurfaces for example), but
maybe for
> enough objects to make it worth implementing?

And what happens when the ray is reflected or refracted?
I don't think that it is possible to implement a method which works only for
a few types of objects.
Also, the cone is represented by a second order equation (IIRC), but the ray
is only a first order equation.

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