pleriche <nomail@nomail> wrote:
> A light source, being invisible, doesn't show up as a reflection. I then thought
> of phong, but even phong 1 doesn't produce a noticeable effect, perhaps because
> of the small diameter of the pipes.

  Try modifying phong_size to make the highlight larger.

> I then tried putting white disks behind the
> spotlights, with additional very bright spotlights shining just on the disks.
> This produced the required effect, but from some angles, the disks themselves
> are visible, which I don't want.

  Rather than doing that, you could define a sphere as a looks_like object
for the light source (when it is defined in the looks_like block, the object
is automatically made shadowless). Define a high ambient finish for the
looks_like object.

-- 
                                                          - Warp

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