I am trying to make a spark generator and noticed this behaviour in Pov-Ray
3.5 and 3.60.
At the end of the code I draw the spark, a set of cylinders generated by a
#while loop.
Using an orthographic camera the objects are only visible when the camera
angle is greater than 3.053 degrees (from the location I am using). As I
reduce the camera angle first the cylinders disappear then a sphere I am
using as an emitter disappears. I thought this might be due to the
behaviour described in 6.4.2.2  Orthographic projection. But if I comment
out the drawing of the cylinders, the sphere reappears.
Can anyone explain it? Also this is very much a WIP and as you will see from
my code (I flatter myself calling it code) I am no programmer. Any
suggestions as to how I can improve it will be very welcome.

In anticipation
 Stephen

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