Wasn't it Warp who wrote:

>  Smooth heightfiels show sometimes a bug which seems to be related to normals
>getting inverted when they shouldn't. This causes wrong lighting which can
>be mainly seen as dark spots (which go away with 'double_illuminate').

Is this the same as

Unsmooth smooth HF shading
(the shading of height-fields with abrupt changes is very ugly when
smooth shading is turned on)
http://news.povray.org/3c02ac19@news.povray.org

which was eventually determined to be a limitation, rather than a bug?

-- 
Mike Williams
Gentleman of Leisure

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