Thanks for the replies!

I am familiar with the Povray clock variable and it's potential - the
problem is that the changes which my objects make from frame-to-frame are
not something that can be calculated in Povray - they are calculated
through molecular modelling software, which spits out 30 sets of atomic
co-ordinates. The transition between frames is not something I can do in
Povray. I was therefore hoping that Povray may be able to take a Povray
representation of my atomic co-ordinates (union of shapes) and interpolate
it with another representation.

The spline idea sounds interesting - the only issue I can see with this is
that each of the 30 frames does not necessarily contain the same number of
shapes - for example, parts will bend, rotate etc... without preserving the
number of objects.

Cheers!

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