Thank you very kindly for the effort you put into the reply.  It must have been
quite a number of years ago that I used the macro I was talking about because I
even searched through some ancient backup CDROMS looking for it and alas still
no luck.  If I knew more about what I was doing, I would modify your code to
give the explosion a more "3-D" effect, where the explosion is more like a torus
(like an expanding, flattened doughnut) and the blue "fire" actually undulates a
bit like a wall pushing outwards.  But I like what you have done and I will plan
on
working with it!

All this because I just happened to see a re-run of Star Trek VI on the SyFy
Network....(it is the very first scene, seconds after the credits stop rolling)!
You know the old saying, only even-numbered Star Trek movies don't suck....

"Kenneth" <kdw### [at] earthlinknet> wrote:
> "Kenneth" <kdw### [at] earthlinknet> wrote:
>
> >
> > #declare first_texture =
> > texture{ // main colors
> >  pigment{
> >   gradient y
> >   pigment_map{...
>
> I should have used color_maps instead, same behavior. (The pigment_map keywords
> were leftovers from some earlier experimentation.)
>
> Ken

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