I have a scene containing various metal pipes, which I want to make into an
animation by moving the camera around the scene. (See
http://www.blueskylark.org/anim/cross4.wmv ) I have a couple of spotlights
which cast nice shadows, but I also want to model the reflections of the lights
on the shiny pipes ( texture { pigment { P_Brass4 } finish { F_MetalD  } } ),
which should give bright spots moving along the pipes as the points at which
the angles of incidence and reflection change.

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. 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.

Any ideas?

Regards - Philip

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