"HFrik" <fri### [at] zonnetnl> wrote in message news:3e23c67f@news.povray.org...

<snip>

Not sure if it's the problem, but check section 9.9.3 in the docs. Basically,
you may need to add "double_illuminate" to your height-field block.

If that doesn't work, try posting the image you're using for the hf to this
group - it might be deficient in either its resolution or colour-depth.

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