> What is the API for PovRay?

POV is a stand-alone program that can be
invoked from the comand line, not a library
to call from other programs.

It would be easier to calculate a camera
rotation in your own code than to try to
make POV do it for you.
Say for example you have a previously
rendered image 640x480 with a 67.38
degree horizontal viewing angle, and
a 50.54 degree vertical veiwing angle.
Then a click coords on the image (X,Y), this
would mean that the camera could be rotated
to point at that spot...
rotate <(Y/480-0.5)*50.54, (X/640-0.5)*67.38, 0>
all you need to do is keep track of your previous
rotation.

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