Wasn't it Christoph Hormann who wrote:
>Mike Williams wrote:
>>>
>>>As said with hf_gray_16 POV-Ray generates PGM files - you have to 
>>>specify them as 'pgm' in the heightfield statement.
>> 
>> Wow, how confusing. You're right and the documentation is wrong.
>> 
>
>What exactly do you think is wrong in the docs?

It says that you can use a PPM file as a 16-bit height field, but you
have to use a PGM file (and the syntax is "height_field pgm filename").

It says that +fp outputs a PPM file, but if hf_gray_16 is active the
output is a PGM file with an incorrect extension.

I don't think that there's any way that someone could guess the correct
way to use PGM hf_gray_16 files by reading the documentation.

-- 
Mike Williams
Gentleman of Leisure

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