>  Patch the source code?

I did not really want to spend the next few years studying the pov-ray 
source... but probably the only solution.

Changing some of the source-code might be interesting, though. I always 
thought a built-in physics-engine would have been nice, but I fear 
implementing it would probably be the work of a lifetime and very probably 
beyond my skills.

To know the amount of light at a certain point in space would allow to 
simulate heliotropic behaviour of plants. Ivy not just creeping up a wall 
but climbing towards the light. Yes, it can be achieved by using trace and 
common sense and lots of trials, too, but to have a mechanism for it would 
have been nice.

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