This is quite easy with the trace() function.  Given a starting point and a
direction vector, the function will shot a ray towards a pre-declared
object.  It then returns the coordinates of where that ray converged with
the object.  This is an unofficial feature so you'll need MegaPOV of course.

-Chris-

Xplo Eristotle <inq### [at] unforgettablecom> wrote in message
news:39A47238.8C87B6CD@unforgettable.com...
> Some time back, Mick Hazelgrove was posting a bunch of images (in the
> images NG, of course) with grass on height fields. I'm looking to do
> something similar, but reading through those posts and looking at
> Gilles' grass macro, I can't fathom how he got it to follow the contours
> of the HF.
>
> Could anyone out there lend me a clue? I wouldn't even know where to
> start experimenting with this...
>
> -Xplo

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