"Bob H." wrote:
> 
> It's a known problem, yes.  I'm not knowledgeable as to why it is though.
> Something about surface normals inverting and double illuminate maybe?
> Oh yeah, there was a double illuminate "bug fix" done in version 0.5, I
> looked it up but that's all I know.

There was discussion about this, see "Heightfield smooth problem" in
this group, started 2000-06-13.
To avoid this, add double_illumination keyword to height field.

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