Pabs wrote in message <38D19836.6EAFBF9C@hotmail.com>...
>The main reason for my post was that to me the current texture stuff seems
>inconsistent across pigments, normals, finishes etc. and that I would like
to
>have more control over the ray leaving a surface or going through an
interior
>(So I can make a mirage)


Making a true mirage would require POV-Ray to be able to find the
intersection points between an object and a differential equation.  If you
look at the source code for POV-Ray, you will see that for some objects,
such as the isosurface, finding where a straight line intersects the object
is quite complicated.  It may not even be possible to find the intersection
points of a differential equation and the object with sufficient accuracy
without spending several hours per pixel.

Mark

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