Alain, thanks for your interest in my problem.  I've reworked my code
according to your suggestions, but there is no change.  I know that the
lenses are behaving as lenses - I can make a line image from a point or an
array of point images from the array of lightsoures, and the images defocus
as I move the screen from the calculated focus position.

I suppose from your comments that you have managed to make a successful
script - there must be something else I'm missing. Would you send it to my
e-mail address 'ani### [at] ntlworldcom'

Yours

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