Wasn't it Christoph Hormann who wrote:
>Mike Williams wrote:
>> 
>> When I use POVRay to generate a hf_gray_16 TGA file, it works as a
>> height_field.
>> 
>> When I do exactly the same thing with a PPM file generated with
>> hf_gray_16 and +fp. I get an error "Parse Error: File is not in PPM
>> format (type 53)" when I try to use it as a height_field. (POVRay 3.6
>> Windows 98se).
>
>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.

-- 
Mike Williams
Gentleman of Leisure

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