I was just thinking that a POV reference would be very helpful.
Specifically, it should list all the parameters and commands in
the POV language, and what the minimum and maximum values are for
each command parameter. It would also list the data type for each
parameter. Ex: turbulence is a float from 0.0 to 1.0. This would
help developers when they are making software to use with POV.

For example, do you need to specify turbulence in order to change
frequency? Turbulence range: 0.0-1.0. 

I got some numbers from the existing POV help file but many
numbers are still sketchy. Some commands have no upper limit. But
when you reach a certain max, does the command have any effect? 

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